The Oar — Analysis

A Listing Upheld: The Steelhead, the Diversion, and the Cost of Fighting

Sun, 28 Jun 2026 00:00:00 GMT

A Listing Upheld:

The Steelhead, the Diversion, and the Cost of Fighting

A Water Policy Series — June 2026

Introduction

On June 12, 2026, a Los Angeles County Superior Court judge denied a petition that almost no one outside Ventura County was watching, and in doing so settled a fight that had run for the better part of five years. The United Water Conservation District — a public agency that captures the Santa Clara River behind a concrete diversion and spreads it across the aquifers beneath the Oxnard Plain — had asked the court to throw out California's decision to list the Southern California steelhead as endangered. The court refused.^[1] It was the district's second defeat on the same question, and it leaves a fully listed fish, a constrained dam, and a water agency that now has to share the river on the fish's legal terms.

The case is small in the way most consequential water cases are small: a single diversion, a single agency, a few hundred surviving fish. But underneath it sits the question every California water board will eventually face. When a species that depends on the water you divert is headed for an endangered listing, do you fight the listing — or do you get ahead of it? United Water chose to fight twice and lost twice. This article walks through what the court actually decided, why the district resisted so hard, what the listing means for water deliveries across eight counties, and why the legal ground beneath the listing is far firmer than the parallel turmoil around the federal Endangered Species Act might suggest. It closes where the more interesting story lives: with the water agencies that chose the opposite path and are demonstrably better off for it.

I. What the Court Actually Decided

The procedural history is a slow march toward a fish. California Trout petitioned the Fish and Game Commission to list the steelhead — Oncorhynchus mykiss, in its below-barrier form — back in June 2021. The Commission advanced it to candidate status; United Water challenged that candidacy decision and lost in October 2023. The Department of Fish and Wildlife then completed its peer-reviewed Status Review recommending the listing, and in April 2024 the Commission voted, unanimously, to list the fish as endangered, the strongest protection state law affords.^[1:1] United Water sued again in May 2025. The June 2026 order disposes of that second suit.

The district made two arguments, and the court rejected both. The first was that the listing lacked "substantial evidence" — that the Commission had leaned on flawed data while ignoring better science, in particular the Cramer Life-Cycle Model, which the district held out as the best available estimate of long-term extinction risk. The court found the Commission had in fact considered the model and reasonably set it aside: Department staff flagged that it used out-of-area and decades-old parameters, displayed "unrealistic levels of resilience," ran more deterministically than the problem warranted, and — decisively — that the district never supplied the model's underlying mathematics or source code, so staff could not fully evaluate it.^[1:2] On the dueling population data, the court accepted the agency's choice of trapping data over noisier snorkel surveys, noted the agency had acknowledged the partial post-drought rebound the district pointed to, and held that data submitted after the administrative record closed was untimely.

What animates the whole ruling is a single principle: courts defer to agency expertise on technical questions. "We will not arbitrate between scientists," the opinion quotes, and it repeats in several forms the rule that conflicting evidence is not enough — a listing stands unless no reasonable person could have reached it.^[1:3] The district's second argument, that the Commission had taken too long, fared no worse: the court held the relevant statutory deadlines are directory rather than mandatory, so missing them does not void the decision, and in any event the only remedy for delay — an order to act — was moot now that the Commission had acted. The petition was denied; the Commission was directed to prepare a judgment.^[1:4] ^[2] ^[3]

The narrow but important takeaway is how United Water lost. It lost on the facts and the science, under a deferential standard — not on any question of what the statute means. That distinction matters enormously for the legal section below.

II. Why a Water District Fights a Fish

To understand the resistance, look at what the listing touches. The Freeman Diversion is a 25-foot structure spanning the Santa Clara River, built in 1991, that pulls an average of roughly 60,000 acre-feet a year out of the river and onto spreading grounds to recharge the Oxnard Plain aquifers; in the wet year of 2023 it diverted a record 148,000 acre-feet.^[4] That recharge is not a luxury. United Water's conservation operations add on the order of 63,000 acre-feet a year to the basins, the highest groundwater recharge rate in California, and that water both supplies farms and cities and holds back the seawater intrusion that threatens the coastal aquifers.^[5] Every acre-foot the listing requires the district to leave in the river for migrating fish is an acre-foot not spread, not stored, not delivered.

The diversion is also the steelhead's problem. It and the district's other structures block the fish from reaching upstream spawning habitat — which is precisely why this is not the district's first encounter with the species. The steelhead was listed as federally endangered in 1997, and in 2018 a federal court ordered United Water to design and build a long-term fish-passage solution at the Freeman Diversion and release enough water downstream for migration; the Ninth Circuit affirmed in 2020.^[6] ^[7] The passage facility that order contemplates has been projected to cost on the order of $60 million — a bill that ultimately reaches the district's ratepayers.^[8] Seen against that backdrop, the litigation reads less as a quarrel about fish biology than as a defense of water deliveries and a hedge against the cost of retrofitting a dam — and the district's repeated reliance on the Cramer Model's more optimistic projections can be understood as an argument that the river could spare more water than the agencies believed. That is my read of the record, not a motive the district has stated; what the district says is that the agencies ignored its best science.

One clarification worth making, because the two are easily conflated: United Water carried this fight essentially alone. It was the sole petitioner in both suits; the intervenors on the other side were CalTrout, the Center for Biological Diversity, and the Wishtoyo Foundation.^[1:5] The agricultural establishment was aligned but not in the courtroom. The Farm Bureau of Ventura County and the California Farm Bureau opposed the listing vocally during the Commission's public process — the county bureau's chief executive questioned whether the historic populations had ever been substantial, and a state bureau analyst warned the listing would "ratchet things up regulatorily for affected water users" and "be used to maximize flows in the rivers and minimize or restrict diversions and groundwater pumping" — and the Association of California Water Agencies questioned the underlying science.^[9] ^[10] But advocacy is not litigation. The record shows alignment of interest, not a documented coalition directing the case. United Water sued because it, uniquely, operates the regulated infrastructure and holds the concrete injury and legal standing that a membership organization does not.

III. What the Listing Means Downstream

The protections reach well beyond Ventura County. The listing covers the steelhead below barriers across its range — from the Santa Maria River, at the Santa Barbara–San Luis Obispo county line, south to the Mexican border — and the agencies tracking it expect effects on water users in San Luis Obispo, Santa Barbara, Ventura, Los Angeles, Orange, Riverside, San Bernardino, and San Diego counties.^[9:1] For any operator whose diversions, dams, or pumping affect that habitat, the listing converts steelhead recovery from an aspiration into a legal constraint: a prohibition on "take," consultation with the Department, the prospect of an incidental-take permit, and operating conditions — bypass flows, passage, screening — designed to let the fish migrate and spawn.

The crucial structural point for the region is that this is now a second regime layered on a first. The fish has been federally listed since 1997 and is the subject of a standing federal passage mandate; the new state listing under the California Endangered Species Act runs in parallel, administered by a different agency, on a different legal foundation, enforceable by a different set of plaintiffs. Compliance with one does not satisfy the other. California offers a bridge — a water agency holding a federal incidental-take authorization can ask the Department for a "consistency determination" so the federal terms also satisfy state law — but absent that, dual listing means dual compliance.^[11] The practical effect on deliveries is therefore not that the water stops, but that the district loses flexibility at the margins, must time and size its diversions around migration windows, and faces a capital bill that flows into the rates its farms and cities pay.

How much new burden the state listing actually adds is a fair question, and the honest answer is: probably less than the alarm around it suggests. The federal regime already does most of the work. The National Marine Fisheries Service biological opinion governing the Freeman Diversion has, by the district's own accounting in its federal takings suit, cost it at least 49,800 acre-feet of water it would otherwise have diverted, and the 2018 federal court order already compels both the passage facility and downstream migration flows.^[7:1] ^[12] Because California's "take" prohibition is narrower than the federal one and does not reach habitat modification as broadly, the state listing's marginal bite — beyond what the federal biological opinion and court order already require — may be modest. Its larger significance is durability and enforcement: a second, independent legal hook, immune to the federal turmoil described below, and a new set of plaintiffs entitled to enforce it.

None of which is to dismiss the district's predicament, because the countervailing public interest here is real. The aquifers United Water recharges are in long-term overdraft, and seawater has been pushing inland beneath the southern Oxnard Plain — intrusion that worsened markedly after 2013 and has already rendered some coastal groundwater unusable for farming or drinking.^[13] Every acre-foot the district spreads is partly a wall against that salt. So the dry-year conflict is not simply fish versus farms; it is fish versus a second environmental harm, the salinization of a critical aquifer, and a board can reasonably worry that flows left in the river in a drought are flows not available to hold the ocean back. That tension is genuine, and any durable resolution has to take the intrusion threat as seriously as the extinction threat.

IV. Why the Ground Under This Listing Is Firmer Than It Looks

It would be easy, reading the national news, to assume endangered-species protections are everywhere in retreat. The federal Endangered Species Act is genuinely under pressure — but almost none of that pressure reaches the state listing United Water just lost to, and the reason is the difference in their legal foundations.

The federal Act rests primarily on Congress's Commerce Clause power, supplemented by the treaty power and authority over federal land.^[14] That Commerce Clause footing is the contested one, because many listed species are intrastate and non-commercial, and a more federalism-minded Supreme Court could someday narrow the Act's reach over them. The more immediate threat is interpretive. The Court's 2024 decision in Loper Bright Enterprises v. Raimondo ended the Chevron doctrine, under which courts deferred to any reasonable agency reading of an ambiguous statute; agencies must now defend the single best reading.^[15] The federal "harm" rule — the long-standing regulation that treats habitat modification as a prohibited take, and the most-used enforcement tool in the Act — was upheld by the Supreme Court in Babbitt v. Sweet Home (1995) partly on the strength of that deference, and in April 2025 the federal wildlife agencies proposed rescinding it, citing the post-Chevron landscape; the proposal drew roughly 357,500 comments.^[16] ^[15:1] The courts have pushed back in both directions — in March 2026 a federal court struck down a set of Trump-era regulations that had narrowed the Act — and the contest is ongoing.^[17] The federal side keeps moving: a Federal Register notice proposes revising the steelhead's federal critical-habitat designation.^[18]

Here is the point that matters for California. The state Act does not stand on the Commerce Clause at all. It rests on the state's police power — the general authority to protect public welfare and natural resources — which needs no commercial hook and is not vulnerable to the theories trimming the federal statute.^[19] Loper Bright is a doctrine about federal courts deferring to federal agencies; California never adopted Chevron in the first place, and its courts apply the more flexible Yamaha framework that the steelhead order expressly invoked.^[1:6] And the state's definition of "take" is narrower than the federal one, reaching the direct acts of hunting, catching, and killing rather than — with only narrow exceptions — habitat modification, so the very federal rule now being rescinded has no clean state analog to attack.^[19:1] The federal Act is a floor, not a ceiling; states may be more protective, and California is. Even if the federal Act were weakened, this listing would stand — which is precisely why state endangered-species law functions as the durable backstop against federal rollback.

The one doctrine that genuinely bridges the federal and state systems is regulatory takings. The Fifth Amendment binds California too, and a water district can argue that mandated bypass flows and water rerouted to a fish passage amount to an uncompensated taking of its water rights — a theory with real precedent in the Tulare and Casitas water cases, though Tulare is widely regarded as an outlier and has been heavily criticized.^[20] This is not hypothetical for United Water: it has already pressed exactly such a claim — not against the state listing, but against the federal government, seeking compensation for the water the steelhead biological opinion costs it. That suit reached the Federal Circuit and is the subject of a petition for Supreme Court review.^[12:1] No comparable claim has yet been raised against the state listing, but the district has plainly shown it will use the takings door, and that — not the Commerce Clause or Loper Bright — is the avenue through which CESA protections are most plausibly attacked. But California's defenses are formidable: water rights here are usufructuary, held subject to the constitutional reasonable-use rule and the public-trust doctrine confirmed in the Mono Lake decision, under which the state retains continuing authority to protect the fish and ecology of its waterways.^[21] A diversion that contributes to a species' extinction is a hard thing to defend as a reasonable use, and a usufructuary right was never a right to the water's corpus in the first place. Whether the takings door actually opens, in other words, turns on California's own water-rights doctrines far more than on anything happening at the Supreme Court.

V. The Reactive Trap, and the Agencies That Escaped It

United Water's path is the expensive one. After two trials it has the constraint anyway, plus the legal bills, plus an adverse record, plus a court controlling the timeline for its $60 million retrofit. The instructive contrast is with the water agencies that treated endangered-species risk as a foreseeable cost and got in front of it.

The closest analog by spirit is the Lower Yuba River Accord. Facing a state order to leave more water in the river for spring-run Chinook and steelhead, the Yuba Water Agency did not litigate to exhaustion; it convened the agencies, fishery groups, and water users and co-developed an alternative. Implemented in 2008, the Accord set science-based, hydrology-flexible instream flows, funded a standing River Management Team with about $565,000 a year for fisheries science, and — by leaning on tools like substituting groundwater in dry years — has kept more water in the river for fish than the state had demanded while still providing roughly 100,000 acre-feet a year on average for fish, cities, and farms. It collected a stack of environmental awards and was extended for another 25 years in 2024–25, the market's verdict that it works.^[22] The Yuba agency turned a regulatory threat into a durable agreement; United Water turned the same kind of threat into two lawsuits.

The instrument-level analog is the Santa Clara Valley Habitat Plan — and the name demands a caution, because this is the Santa Clara Valley in the Bay Area, a different watershed entirely from United Water's Santa Clara River in Ventura County. What makes it the best structural fit is that one of its permittees is a water district. The Santa Clara Valley Water District — Valley Water — joined the County of Santa Clara, San José, Morgan Hill, Gilroy, and the regional transit authority in a combined Habitat Conservation Plan and Natural Community Conservation Plan, a single instrument satisfying both the federal and state Acts. Permits issued in 2013 with a 50-year term, covering 18 listed and at-risk species, and — critically for an operating utility — the plan folds Valley Water's routine Stream Maintenance Program and its water-supply and flood-protection projects into the same umbrella authorization, so the district does not consult species-by-species every time it stabilizes a bank or clears a channel.^[23] The conservation is funded by a tiered development-impact fee rather than loaded onto ratepayers in an emergency, and the results are real: through eleven years of implementation the program had given take coverage to more than 400 projects while conserving roughly 15,080 acres against a 46,920-acre reserve target, with conserved land far outrunning the roughly 2,030 acres of permanent impact it has authorized.^[23:1] Where United Water has open-ended uncertainty, Valley Water bought five decades of operating certainty.

The model is not unique to California. The Edwards Aquifer Habitat Conservation Plan in central Texas, built collaboratively in 2013 by the regional aquifer authority alongside San Antonio and the spring cities, protects endangered species dependent on spring flow and is widely held up as a success — running, by its own permit accounting, at less than a third of its allowable take while maintaining a captive-refugia program for the covered species.^[24] A major metropolitan water supply secured its own long-term certainty by committing to species protection, rather than by litigating against it.

The common thread is unmistakable. Each of these agencies moved early, negotiated rather than fought, secured flexible and science-based terms instead of court-imposed ones, and spread the cost across the parties that benefit. Each holds, as a result, the one thing United Water still lacks: a predictable future.

VI. What a Proactive United Water Would Have Looked Like

The tools that make the proactive path possible are not exotic; they are written into the same statutes United Water litigated under. Before a species is listed, an agency can enter a Candidate Conservation Agreement with Assurances, trading early conservation for a guarantee against new restrictions if the listing later comes. After listing, a Safe Harbor Agreement rewards habitat improvement, a combined Habitat Conservation Plan and Natural Community Conservation Plan delivers long-horizon certainty, and California's instream-flow dedication mechanism lets an agency commit water to fish while protecting its underlying right. Every one of these instruments exists to reward acting early — to convert an open-ended liability into a known, fixed commitment.

A version of United Water that had read its own watershed honestly would have looked less like a defendant and more like the Yuba agency. The pieces are already on the ground. The district holds 82,000 acre-feet of surface storage behind Santa Felicia Dam at Lake Piru, an extensive recharge network, and the conveyance to move water where it is needed.^[4:1] ^[5:1] The region's most underused asset is the advanced water-purification facility on the Oxnard Plain, which already produces recycled water and runs at roughly a quarter of its designed capacity — built toward 25 million gallons a day, operating near 6.25.^[25] Carrying it to full build-out could add on the order of twenty thousand acre-feet a year of drought-proof, river-independent supply, and it would do double duty as groundwater-sustainability compliance and a seawater-intrusion barrier.

None of that is free, and a candid version of this argument has to say so. The purification facility is a reported $75-to-$80-million project, its current 14.4-mgd expansion is financed in part by a $48 million federal WIFIA loan, and — crucially — it belongs to the City of Oxnard, not to United Water, so capturing its yield is a matter of inter-agency partnership and cost-sharing rather than a line item the district can simply approve.^[26] Recycled water is also not perfectly fungible with river diversions: it differs in location, in cost per acre-foot, and in whether it recharges the basin or is delivered directly, so the "twenty thousand acre-feet" figure is an order-of-magnitude estimate of potential offset, not a guaranteed substitution. And United Water's own revenue base is narrower than the comparators': it runs on groundwater pumping charges and water-delivery rates, not the development-impact fees that bankroll the Santa Clara Valley reserve or the metropolitan ratepayer base behind the Edwards plan. The proactive path is cheaper than two lost lawsuits and a court-dictated retrofit — but it is an investment, not a windfall, and pretending otherwise would be its own kind of dishonesty.

It is also fair to ask whether that path was ever fully open. United Water has been entangled with this fish since the 1997 federal listing and under a federal passage order since 2018; by the time the state listing arrived, "get ahead of it" was, for the steelhead specifically, two decades too late. The transferable lesson is therefore less a reproach of United Water than a warning to every district still upstream of a candidate species: the cheap, high-certainty tools — a candidate conservation agreement, an early habitat plan — expire the moment the listing lands. Pair an expanded recycled-water program and additional aquifer storage with a functional-flows regime — water released at the specific moments the fish need it rather than as a blunt year-round minimum — and a negotiated permit that ends the litigation, and the district would have protected its deliveries and the steelhead at once.

That was always the choice. Overturning a listing was never likely — the deferential standard of review makes these cases hard to win once the agency's science is in order — but the outcome was not preordained, and that is precisely the point: the district had little control over whether the listing stood, and a great deal of control over the terms, the timeline, and the cost of living with it. It spent five years and two trials on the part it could not change and deferred the part it could. The lesson for every other California water board sitting upstream of a declining species is not subtle: endangered-species risk is a financial and operational risk like any other, the law actively rewards the boards that move first, and — for a district whose own aquifer is also under siege from the sea — the worst outcome is to spend down both money and goodwill in a courtroom and arrive at the negotiating table later anyway, with less of each.

Sources

United Water Conservation District v. California Fish and Game Commission, No. 25STCP01671, Superior Court of California, County of Los Angeles, Minute Order (Final Order on Petition for Writ of Mandate), June 12, 2026 (Hon. Tiana J. Murillo). ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎
Center for Biological Diversity, "Court Upholds Southern California Steelhead Protections," June 16, 2026. https://biologicaldiversity.org/w/news/press-releases/court-upholds-southern-california-steelhead-protections-2026-06-16/ ↩︎
Courthouse News Service, "Judge upholds protections for Southern California steelhead trout." https://www.courthousenews.com/judge-upholds-protections-for-southern-california-steelhead-trout/ ↩︎
United Water Conservation District, "Freeman Diversion." https://www.unitedwater.org/freeman-diversion/ ↩︎ ↩︎
United Water Conservation District, "Groundwater Management" (https://www.unitedwater.org/groundwater-management/); Association of California Water Agencies, "Unprecedented Diversions Replenish Ventura County Groundwater Resources" (https://www.acwa.com/news/unprecedented-diversions-replenish-ventura-county-groundwater-resources/). ↩︎ ↩︎
NOAA Fisheries, "Southern California Steelhead." https://www.fisheries.noaa.gov/west-coast/endangered-species-conservation/southern-california-steelhead ↩︎
Center for Biological Diversity, "Appeals Court Victory Secures Steelhead Protection on California's Santa Clara River," February 26, 2020. https://biologicaldiversity.org/w/news/press-releases/appeals-court-victory-secures-steelhead-protection-on-californias-santa-clara-river-2020-02-26/ ↩︎ ↩︎
Santa Paula Times, "UWCD: New Freeman Diversion fish passage projected to cost $60 million." https://m.santapaulatimes.com/news/archivestory.php/aid/29722/UWCD:_New_Freeman_Diversion_fish_passage_projected_to_cost_$60_million.html ↩︎
Maven's Notebook / Ag Alert, "Steelhead protections could bring new water restrictions," May 8, 2024. https://mavensnotebook.com/2024/05/08/ag-alert-steelhead-protections-could-bring-new-water-restrictions/ ↩︎ ↩︎
Valley Ag Voice, "Steelhead Protections Could Bring New Water Restrictions." https://www.valleyagvoice.com/steelhead-protections-could-bring-new-water-restrictions/ ↩︎
California Fish & Game Code § 2080.1 (consistency determinations: a federal incidental-take statement or permit for a species also listed under CESA may, on the Department's concurrence, satisfy CESA in lieu of a separate § 2081 permit). ↩︎
United Water Conservation District v. United States — the district's takings claim for water foregone under the NMFS steelhead biological opinion governing the Freeman Diversion. The Court of Federal Claims held the restriction a regulatory rather than physical taking and the regulatory claim unripe, and the Federal Circuit affirmed (Fed Circuit Blog opinion summary, May 28, 2025, https://fedcircuitblog.com/2025/05/28/opinion-summary-united-water-conservation-district-v-united-states/; FindLaw, https://caselaw.findlaw.com/court/us-federal-circuit/117117322.html). The district petitioned for certiorari (No. 25-523); as of late 2025 the petition was pending, with amicus briefs filed by the Cato Institute, the Association of California Water Agencies, the Washington Legal Foundation, and the Liberty Justice Center (Nov.–Dec. 2025) (https://www.supremecourt.gov/DocketPDF/25/25-523/385938/20251128095501303_UWCD v. US_Final.pdf). The ~49,800-acre-foot figure is the district's own accounting in that filing. ↩︎ ↩︎
United Water Conservation District, Open-File Report 2021-03, "Saline Intrusion and 2020 Groundwater Conditions Update — Oxnard and Pleasant Valley Basins" (https://www.unitedwater.org/wp-content/uploads/2021/12/UWCD-OFR-2021-03-Saline-Intrusion-and-2020-GW-Conditions-Update-Oxnard-and-PV-Basins.pdf); Fox Canyon GMA, Oxnard Subbasin Groundwater Sustainability Plan determination (https://fcgma.org/wp-content/uploads/2022/05/Oxnard_GSP2021_Determination.pdf); "Oxnard Plain," overview (https://en.wikipedia.org/wiki/Oxnard_Plain). ↩︎
Endangered Species Act of 1973, 16 U.S.C. §§ 1531 et seq.; the Act's congressional findings expressly invoke U.S. wildlife treaties and conventions (16 U.S.C. § 1531(a)(4)), the basis for its secondary treaty-power footing. The Commerce Clause is the primary and the contested foundation: every federal court of appeals to consider the question has upheld the Act's application to purely intrastate species — see GDF Realty Investments, Ltd. v. Norton, 326 F.3d 622 (5th Cir. 2003), and National Association of Home Builders v. Babbitt, 130 F.3d 1041 (D.C. Cir. 1997) — though the theory remains academically and politically disputed. See Bradford C. Mank, "After Gonzales v. Raich: Is the Endangered Species Act Constitutional Under the Commerce Clause?," Univ. of Cincinnati College of Law (https://scholarship.law.uc.edu/fac_pubs/266/); overview at Cornell Legal Information Institute, "Endangered Species Act (ESA)" (https://www.law.cornell.edu/wex/endangered_species_act_(esa)). ↩︎
Holland & Knight, "'Harm' Redefined: 'Habitat Modification' Could Be Cut from Endangered Species Act Regulations," April 2025. https://www.hklaw.com/en/insights/publications/2025/04/redefining-harm-change-proposes-removing-habitat-modification ↩︎ ↩︎
Federal Register, "Rescinding the Definition of 'Harm' Under the Endangered Species Act," April 17, 2025. https://www.federalregister.gov/documents/2025/04/17/2025-06746/rescinding-the-definition-of-harm-under-the-endangered-species-act ↩︎
Earthjustice, "Federal Court Strikes Down President Trump's Attacks Against Endangered Species Act," 2026 (https://earthjustice.org/press/2026/federal-court-strikes-down-president-trumps-attacks-against-endangered-species-act-restores-bedrock-environmental-law-to-pre-trump-status); Center for Biological Diversity, "Court Overturns Trump Administration Regulations That Weakened Endangered Species Act," March 31, 2026 (https://biologicaldiversity.org/w/news/press-releases/court-overturns-trump-administration-regulations-that-weakened-endangered-species-act-2026-03-31/). ↩︎
Federal Register, "Endangered and Threatened Wildlife and Plants; 12-Month Finding and Proposed Rule To Revise Critical Habitat Designation for Southern California Steelhead," June 29, 2026. https://www.federalregister.gov/documents/2026/06/29/2026-13076/endangered-and-threatened-wildlife-and-plants-12-month-finding-and-proposed-rule-to-revise-critical ↩︎
California Endangered Species Act, Fish & Game Code §§ 2050 et seq.; "take" defined at Fish & Game Code § 86 ("hunt, pursue, catch, capture, or kill, or attempt" to do so). Unlike the federal Act — whose "harm" rule reaches habitat modification — CESA's definition includes neither "harm" nor "harass," and the California Attorney General concluded that CESA does not prohibit indirect harm to listed species through habitat modification (78 Ops. Cal. Atty. Gen. 134 (1995)); permitted take is instead handled through incidental-take permits under Fish & Game Code § 2081(b). On California's situational agency deference, Yamaha Corp. of America v. State Bd. of Equalization (1998) 19 Cal.4th 1. ↩︎ ↩︎
Tulare Lake Basin Water Storage Dist. v. United States, 49 Fed. Cl. 313 (2001) (Wiese, J.) (holding ESA-driven reductions in water deliveries a per se physical taking); Casitas Mun. Water Dist. v. United States, 543 F.3d 1276 (Fed. Cir. 2008). Tulare's physical-takings reasoning has been widely criticized and not followed in later water-rights takings cases — see Klamath Irrigation Dist. v. United States, 67 Fed. Cl. 504, 537–538 (2005), and Allegretti & Co. v. County of Imperial, 138 Cal. App. 4th 1261 (2006) — and the Casitas panel itself expressly declined to opine on whether Tulare was correctly decided (543 F.3d at 1296 n.16). ↩︎
Cal. Const. art. X, § 2 (reasonable use); National Audubon Society v. Superior Court (1983) 33 Cal.3d 419 (public-trust doctrine; "Mono Lake" decision). ↩︎
Lower Yuba River Accord — Yuba Water Agency (https://www.yubawater.org/157/Lower-Yuba-River-Accord); Water Education Foundation, "Yuba Accord and Yuba River" (https://www.watereducation.org/aquapedia-background/yuba-accord-and-yuba-river). ↩︎
NCCP Plan Summary – Santa Clara Valley Habitat Plan, California Department of Fish and Wildlife (https://wildlife.ca.gov/Conservation/Planning/NCCP/Plans/Santa-Clara); Santa Clara Valley Habitat Agency (https://scv-habitatagency.org/178/Santa-Clara-Valley-Habitat-Plan); ICF, "Santa Clara Valley Habitat Plan Balances Development and Conservation" (https://www.icf.com/clients/environment/santa-clara-valley-habitat-plan-balances-development-and-conservation); Valley Water, "Stream Maintenance Program" (https://www.valleywater.org/project-updates/stream-maintenance-program). ↩︎ ↩︎
National Habitat Conservation Plan Coalition, "The Edwards Aquifer HCP, Texas" (https://www.nhcpcoalition.org/success-stories/the-edwards-aquifer-hcp-texas/); Edwards Aquifer Authority, "About EAHCP" (https://www.edwardsaquifer.org/edwards-aquifer-habitat-conservation-plan/about-eahcp/). ↩︎
Western City, "Oxnard's GREAT Program for Groundwater" (https://www.westerncity.com/article/oxnards-great-program-groundwater); City of Oxnard Water Division (https://www.oxnard.gov/public-works/water-division). ↩︎
Capacity and treatment train: the GREAT-program Advanced Water Purification Facility is designed for a 25-mgd build-out (initial phase 6.25 mgd), using microfiltration, reverse osmosis, and UV advanced oxidation — "The Oxnard advanced water purification facility," Water Science & Technology (2010), PubMed 20220237; Western City, "Oxnard's GREAT Program for Groundwater" (https://www.westerncity.com/article/oxnards-great-program-groundwater). Ownership and financing are confirmed: the facility is owned by the City of Oxnard (not United Water), and its current expansion — adding 14.4 mgd of capacity, with construction expected to finish in 2027 — is financed in part by a $48 million federal WIFIA loan announced in May 2022 (U.S. EPA, "EPA Announces $48 Million WIFIA Loan to Expand Water Supplies in Oxnard," https://www.epa.gov/newsreleases/epa-announces-48-million-wifia-loan-expand-water-supplies-oxnard-california; City of Oxnard, "Advanced Water Purification Facility (AWPF)," https://www.oxnard.gov/advanced-water-purification-facility). ↩︎

Desalination in California, Part IV: The Israel Mirror

Sat, 27 Jun 2026 00:00:00 GMT

Desalination in California, Part IV:

The Israel Mirror

A Water Policy Series — June 2026

Introduction

The first three articles in this series diagnosed a problem and located its cause. Desalination is California's most expensive water tool, ecologically costly in ways that demand active mitigation, and a structurally small contributor to supply — defensible only as a narrow, precipitation-independent insurance layer against the multi-year droughts that disable every cheaper alternative at once (Part I). No one in California actually decides how much of each tool to build; the proportion emerges from fragmented grant funding, asymmetric permitting friction, and whichever local board or private developer happens to act first (Part II). And that same pattern — many actors holding competing legal claims to a shrinking, oversubscribed resource, governed by agreements renegotiated in crisis rather than adjusted continuously — recurs at every scale up to the Colorado River, which means California's deepest deficit is one of governance, not technology or money (Part III).

When people look for a model for how to do better, they almost always turn to the same country. Israel turned a chronic, existential water deficit into a managed surplus in a single generation, and it did so with the two levers California argues about most: seawater desalination and aggressive, enforced efficiency. The comparison is invoked so often that it has become a kind of shorthand for ambition. This article takes it seriously enough to test it. It asks what Israel actually does, what its success actually costs in carbon and seawater, and — the question that matters most for a state built atop a century-old structure of water rights — how much of the Israeli model California's legal architecture could adopt even if it decided to.

I. A Useful Mirror, and Where It Cracks

The climate resemblance is real, not rhetorical. Israel sits in a Mediterranean semi-arid regime — wet winters, dry summers — with roughly three-quarters of annual precipitation falling in a three-month window and a sharp gradient from a wetter north to an arid south, with rainfall ranging from about 600 millimeters in the north to under 150 millimeters in the south.^[1] That is structurally the same precipitation signal that drives California: variable, front-loaded into winter, unreliable in exactly the years supply matters most. Among real-world analogs, Israel is one of the closest available rather than a stretch.

The resemblance ends at the structure of the state. Israel is a single, small, centrally governed nation — roughly 22,000 square kilometers and 9.8 million people — managed through one national water utility and one national regulator. California is a sub-national state inside a federal system, its water governed across federal projects, state agencies, and thousands of local districts and groundwater agencies; the fragmentation of this series has been documented at every turn. California's economy and population are roughly four times Israel's, and its agricultural sector — almonds, pistachios, and other thirsty permanent crops — is a vastly larger claim on a vastly larger budget. Anything Israel accomplishes by national fiat, California can attempt only through state preemption of local control or a degree of interagency cooperation it has historically failed to achieve (Part II). The honest framing, then, is not "Israel solved this, and California hasn't." It is that Israel operates a machine California does not possess, and most of what follows turns on that single difference.

II. How Far Ahead Israel Actually Is

The scale gap is genuinely striking. Israel runs five major Mediterranean desalination plants — Ashkelon, Palmachim, Hadera, Sorek, and Ashdod — with a sixth, Sorek B, set to reach full operation in 2025, adding 200 million cubic meters of capacity.^[2] Together, they supply on the order of 70 to 80 percent of the country's potable water, and desalinated water accounts for roughly 90 percent of domestic freshwater once reuse is folded in; in 2022, 86 percent of Israel's drinking water came from desalination. Sorek alone covers about a fifth of national demand.^[3] Set that against Carlsbad, the largest plant in the United States, which supplies under a tenth of San Diego County's water and a fraction of a percent of California's (Part I).

The number that should command California's attention, though, is cost. Sorek produces water at roughly $0.58 per cubic meter; Sorek B is contracted at about $0.41 per cubic meter, which, converted to the acre-foot units this series uses, is on the order of $500 to $715 per acre-foot.^[4] Carlsbad's water runs $3,400 to $4,000 (Part I). Israel is making desalinated seawater at something between a fifth and a seventh of the cost of California's flagship plant. The reflexive explanation is that it is superior technology, and it is wrong: Sorek's energy use, 3 to 4 kilowatt-hours per cubic meter, is comparable to California's plants once units are reconciled. The real drivers are mundane and, crucially, mostly structural. Sorek self-generates its own electricity from natural gas, with only a backup grid tie, insulating its costs from the electricity price volatility that flows almost directly into Carlsbad's water price (Part I). Israel has built five-plus plants on a repeatable design-and-contracting template over two decades, while California permits each plant — Carlsbad, Huntington Beach, Doheny — as a bespoke regulatory proceeding. And nothing in Israel resembles Carlsbad's take-or-pay dispute, because plants are commissioned under a national utility rather than negotiated piecemeal by competing local districts.^[5] The cost gap, in other words, is largely a governance gap wearing an engineering disguise — which is precisely the diagnosis this series has been building toward.

III. The Costs Israel Doesn't Advertise

Israel's success carries an environmental bill that maps directly onto the brine and intake debates of Part I. The five plants discharge a volume of brine nearly equal to the freshwater they produce, at a salinity around 80, roughly twice that of the ambient Mediterranean. Being denser, the plume sinks and creeps along the seabed, detectable as far as five kilometers from the outfall, with documented harm inside the mixing zones to benthic organisms — seagrasses, polychaetes, corals, and the foraminifera most often used as a marker — and shifts in community composition; anti-scalant additives have also pushed phosphorus loads up, to about 9 percent of the sea's phosphorus pollution by one 2014 accounting.^[6] Israel's mega-plants largely draw through open intakes, with the same impingement and entrainment costs the California Coastal Commission cited in killing Huntington Beach, and they require dedicated boron-removal stages — boron passes reverse-osmosis membranes and poisoned crops at Eilat in 1997 — plus remineralization of the corrosive, mineral-stripped permeate before it enters distribution.^[7] The contrast with California is the lesson: the state's 2015 Ocean Plan caps discharge salinity at no more than 2.0 parts per thousand above background within 100 meters of the outfall, prefers subsurface intakes, and encourages brine commingling. Israel's high-salinity plumes and open intakes would not clear those limits without substantial added engineering — part of why California desal is slower and costlier to permit, and a reminder that Israel's environmental record is a cautionary counterpoint to its cost record, not only a model.^[8]

The carbon bill is larger and less discussed. The natural gas that makes Sorek cheap is also the biggest asterisk on Israel's "drought-proof water." Gas-fired combined-cycle generation emits roughly 450 to 500 grams of CO₂-equivalent per kilowatt-hour on a lifecycle basis, compared with about 980 for coal and 10 to 50 for wind or solar; Israeli desalination amounts to roughly 1.4 to 1.8 kilograms of CO₂ per cubic meter of water.^[9] And because gas is mostly methane — a potent near-term greenhouse gas that leaks at perhaps 2 to 3 percent upstream — the climate advantage over coal narrows sharply once leakage climbs past about 3 percent.^[10] The exportable lesson here is not "burn gas." It is the structural insight underlying Sorek's price: pairing a plant with dedicated generation to escape grid-price volatility stabilizes the cost, and California could capture the same stability with renewables-plus-storage rather than fossil fuel, closing the very data gap Part I flagged about what actually powers the state's existing plants.

IV. The Mechanism That Actually Matters

Strip away the plants, and the biggest difference between the two systems is not concrete but law: how each treats efficiency in relation to the right to use water. Israel's foundation is Section 1 of its Water Law of 1959, which declares the nation's water sources public property under state control; owning land conveys no right to the water beneath it.^[11] Because no one holds water as private property, every allocation is a revocable, state-granted quota rather than a vested entitlement — the hinge the entire system turns on. The Water Authority assigns those quotas administratively, not by seniority or by auction, and revises them annually, downward during drought. On top of that sits a block-pricing structure that does the real work: a farmer's first 70 percent of allocation is priced low, the next 30 percent carries roughly a 20 percent premium, and anything beyond the allocation is billed at a steep penalty rate, with recycled water priced cheapest of all.^[12] Farmers are never barred from using more; they simply pay escalating prices, a continuous efficiency signal rather than a one-time test. When the system needs to shed demand outright, the Authority has imposed permanent quota cuts — as much as 41 percent for national-system irrigators — and allows farmers to voluntarily waive part of their quota in exchange for compensation, a managed, paid drawdown of their entitlement.^[13] Recent reforms only sharpen the design: as of January 2026, fresh-water rates fell up to 34 percent and recycled rates about 22 percent, with Shafdan effluent priced through 2030 without counting treatment cost, deliberately locking reuse below freshwater.^[14]

One nuance deserves emphasis, because it is usually lost in the admiration. Israel's system mostly compels efficiency; it does not reward it with a dividend. Because quotas cannot be resold, a farmer who conserves chiefly avoids the premium and penalty tiers and pays a smaller bill — the saved water is not an asset they can sell, and the only affirmative payment is the one-time waiver buyout. California, remarkably, contains the opposite instinct in embryo. Its prior-appropriation doctrine — "first in time, first in right" — historically punished conservation through the "use it or lose it" rule, under which a right can be forfeited after five years of non-use, so saving water risked signaling you never needed it.^[15] The state's statutory fixes, Water Code sections 1010, 1011, and 1011.5, are defensive patches: they deem conservation-driven reductions equivalent to beneficial use so no forfeiture occurs, and — the genuinely interesting part — section 1011 lets conserved water be sold, leased, or transferred.^[16] California's only universal efficiency ceiling is the constitutional reasonable-use rule, Article X, Section 2, which bars waste across every right but functions as a case-by-case backstop, not a continuous price.^[17] The directional contrast is the heart of the matter: Israel actively re-prices and re-quotas water toward efficiency from the center, while California mostly prevents conservation from being punished and otherwise leaves entitlements fixed regardless of how efficiently they are used.

V. What California Is Actually Working With

To see why importing the Israeli mechanism is so much harder than admiring it, you have to look at what California's rights system actually is — not one design but a layered stack of doctrines from different centuries, each binding different rights. Riparian rights, adopted from English common law at statehood, attach to land along a watercourse, carry no priority among holders, and are never lost by non-use. Prior appropriation, born of Gold Rush custom and codified across the 1850s and 1870s, governs by seniority. The Water Commission Act of 1914 drew the decisive line still in force today: the State Water Board permits and regulates post-1914 appropriative rights, but pre-1914 appropriative rights and riparian rights fall entirely outside its permitting jurisdiction. Above all of it sits the 1928 reasonable-use amendment, which reaches every right; the public-trust doctrine confirmed in the 1983 Mono Lake decision, which keeps even granted rights under continuing state supervision; the 2014 Sustainable Groundwater Management Act, which finally regulates groundwater; and federal and tribal reserved rights under the Winters doctrine, senior by reservation date and exempt from the state system.^[18] Reasonable use and the public trust bind everyone; the Board's permit power binds only the post-1914 tier; the most senior rights answer to almost no one.

Layered on that legal map is a quantitative fact that dwarfs every reform proposal. The landmark Grantham and Viers analysis found California has allocated roughly 370 million acre-feet of appropriative water rights against an average supply of about 70 million — more than five times more water promised on paper than the rivers carry, an over-allocation worse still in the Delta and in some tributaries.^[19] Most rights are never fully exercised, so paper volume is not delivered volume; but the gap means seniority, not the face value, decides who actually gets water in a dry year. And the senior tiers that matter most are precisely the ones the state never permitted and barely measures — riparian and pre-1914 rights are largely unquantified, with the Board compelling data only recently and, in a 2015 order, from just 445 major diverters on the Sacramento and San Joaquin.^[20] The post-1914 tier, the Board does administer numbers in the tens of thousands of permits and licenses.^[21] Federal and state project water rides on top: the Central Valley Project delivers about 7 million acre-feet a year, and the State Water Project holds 4.23 million in contracts but has delivered an average of only 2.4 million.^[22] Tribal Winters rights remain mostly unquantified — only about 12 of 109 California tribes have settled rights, totaling roughly 0.2 million acre-feet.^[23] And agriculture takes roughly 80 percent of the state's developed supply against urban areas' 20.^[24]

Tier	Approximate scope	Board jurisdiction
Riparian	Senior, largely unquantified; not lost by non-use	No
Pre-1914 appropriative	Senior; poorly documented; dominates the senior tier	No
Post-1914 appropriative	Tens of thousands of permits/licenses; the only curtailable tier	Yes
All appropriative (face value)	~370 MAF claimed vs ~70 MAF average supply (~5x)	Mixed
Federal CVP / State SWP	~7 MAF delivered; 4.23 MAF contracted / ~2.4 MAF delivered	Project rights
Tribal/federal (Winters)	~0.2 MAF quantified (12 of 109 tribes); much unquantified	No (federal)

The table makes the obstacle plain. Israel can move its dials because the state owns the water, measures every quota, and grants nothing it cannot revise. California has promised five times its supply, cannot fully see its most senior claims, and lacks any single body empowered to reprice them. That is why "just meter it and charge for it" is a far larger undertaking here than the Israeli example suggests.

VI. Can the Israeli Mechanism Fit California?

Assessed honestly, the answer is a qualified yes — but only inside specific containers, never across the senior surface rights that matter most. Israeli-style tiered pricing is already lawful in two places. The clearest is the SGMA basin: groundwater sustainability agencies can set pumping allocations and graduated, penalty-bearing prices for groundwater without touching surface-water seniority at all, which makes a basin like Fox Canyon the nearest thing California has to Sorek's allocation logic.^[25] The second is the retail rate structure of any district, which can charge tiered rates for the water it delivers regardless of the underlying right. Both are real openings, and both are already permitted.

The walls are equally clear. You cannot impose a scarcity price on a senior or pre-1914 diversion that legally pays only the cost of conveyance and project repayment — there is no statutory hook to charge a vested right-holder more than the cost of service. And for public agencies, Proposition 218 forbids property-related water charges from exceeding the proportional cost of serving a parcel. In the 2015 Capistrano Taxpayers Association case, an appellate court struck down San Juan Capistrano's tiered rates precisely because the tiers were set from usage budgets rather than the actual cost of delivering water at each level.^[26] That is the legal mirror image of Israel's deliberately punitive top tier: California public agencies may use tiers, but the tiers must be cost-justified, not scarcity penalties. The realistic hybrid, then, keeps seniority intact while stacking the levers that are available — aggressive tiered pricing inside SGMA basins and cost-justified district rates, a freely tradable market in conserved water so efficiency earns the dividend Israel's no-resale system lacks, reasonable-use and public-trust pressure plus validity review on the senior tiers, and universal metering as the precondition for all of it. California cannot copy Israel's central scarcity price for senior water. It can approximate the incentive while leaving the seniority structure legally untouched.

VII. The Remedy: Buy the Cooperation You Cannot Compel

Which raises the question every reform proposal eventually collides with: what moves the senior right-holders who cannot simply be ordered to comply? Because their rights are treated as constitutionally protected property, pure coercion invites litigation and runs into formidable political power — the recent stalling of bills to curtail senior rights in drought (AB 1337) and to investigate the validity of senior claims (SB 389) is the proof, even as a companion enforcement bill (AB 460) did pass.^[27] Durable reform therefore needs buy-in, and the lesson from California's own successes is that buy-in comes from converting saved water into money and security rather than confiscating rights.

The precedents already exist, and they share a single design. Section 1011's transfer right turned conservation into income in the 2003 Quantification Settlement Agreement, under which the Imperial Irrigation District moved up to 200,000 acre-feet a year to San Diego over a 75-year term — the largest agriculture-to-urban transfer in the country — with its senior Colorado River priority left fully intact.^[28] The Palo Verde–Metropolitan fallowing program pays farmers an entry payment plus recurring payments to rotate-fallow land, freeing tens of thousands of acre-feet a year without anyone losing a right.^[29] At basin scale, the 2023 Lower Colorado deal had three states conserve about 3 million acre-feet through 2026, with 2.3 million of it compensated by roughly $1.2 billion in federal funds — "pay farmers not to farm," which is functionally the cash version of Israel's waiver-for-compensation.^[30] Australia's Murray-Darling buybacks, which recovered more than 2,100 gigaliters by voluntarily purchasing permanent entitlements from willing sellers, are the largest expression of the same idea, and reinforce its two conditions: purchase from willing sellers is the most cost-effective tool, but it must be paired with structural-adjustment funding for the communities affected.^[31]

The grand bargain that follows is straightforward to state and hard to fund. Senior holders accept metering, validity review, and basin pricing in exchange for a guaranteed, quantified baseline allocation — their seniority secured, not eroded — plus a paid market for everything above it: conserve below the baseline and sell the difference, with only the marginal water exposed to scarcity pricing or curtailment, always compensated, never retroactively clawed back. Metering becomes acceptable not as surveillance but as the precondition for getting paid for verified savings. The remedy, in short, is not a legal weapon but a business proposition, and California already owns every building block — section 1011 transfers, the QSA, Palo Verde, federally funded Colorado conservation. The unfinished work is to scale and standardize them, not to invent them.

Conclusion

The Israel mirror, looked at closely, does not reflect what it is usually invoked to reflect. It is not proof that the answer is more desalination — Israel's plants are cheap mainly because a national utility builds them on a standard template and powers them with dedicated generation, advantages that are organizational, not technological, and that come bundled with a real carbon and brine cost California's own rules would not permit. Nor is it proof that the answer is simply to price water like Israel does, because the thing that makes Israeli pricing work — a state that owns the water, measures every quota, and grants nothing it cannot revise — is exactly the thing California's century-old, five-times-oversubscribed, seniority-bound rights system does not have and cannot easily acquire. What survives the comparison is the same lesson this series reached by every other route. Israel's real advantage is that one body sees the whole system and can move its dials; California's real deficit is that no one can. The transferable parts of the Israeli model are the ones California can adopt without that machine — tiered pricing inside the basins where it is already legal, conserved water made into a sellable asset, and senior cooperation bought rather than commanded. Those are governance moves, not construction projects. After four articles, the conclusion is the same one Part III reached and Israel only confirms: California is not short of water tools, or of money, or even of models to copy. It is short of the structure required to use what it already has as a system — and that, unlike a desalination plant, cannot be imported.

Footnotes

Sources

This Series

Desalination in California, Part I: The Scope of the Problem

Desalination in California, Part II: Who's at the Table

Desalination in California, Part III: What California Actually Needs

Israel — Desalination, Water Management & Environment

Wikipedia — Water supply and sanitation in Israel; Water scarcity in Israel — en.wikipedia.org

Blackridge Research — Top desalination plants in Israel; Sorek and Ashkelon project profiles — blackridgeresearch.com

Times of Israel — Desalination plant goes into full operation; Government amends Water Law to cut price for farmers — timesofisrael.com

MDPI — Addressing Desalination's Carbon Footprint: The Israeli Experience; Key Environmental Impacts along the Mediterranean Coast of Israel — mdpi.com

American Chemical Society (Environmental Science & Technology) — Impacts of Desalination Brine Discharge on Benthic Ecosystems — pubs.acs.org

PLOS One — Long-term brine discharge effect on benthic foraminifera — journals.plos.org

ScienceDirect — Boron removal from seawater; Remineralization of desalinated water — sciencedirect.com

European Investment Bank — Sorek alleviates Israel's water shortage — eib.org

Green Prophet — Water allocation, irrigation efficiency, rationing and pricing in Israel — greenprophet.com

OECD — Israel's sustainable water management plans — oecd.org

UNEP Law and Environment Assistance Platform — Water Law, 5719-1959 — leap.unep.org

University of Arizona Water Resources Research Center — Israel's public ownership of water — wrrc.arizona.edu

Energy & Carbon

EcoFlow — GHG emissions per kWh by source — ecoflow.com

IOPscience (Environmental Research Letters) — Net life-cycle GHG intensities of gas and coal at varying methane leakage — iopscience.iop.org

International Energy Agency — Global Methane Tracker 2025 — iea.org

California Water Law & Rights

California Water Code §§ 1010, 1011, 1011.5 — california.public.law

California Constitution, Article X, Section 2; State Water Board reasonable-use doctrine — waterboards.ca.gov

Water Education Foundation — Appropriative Rights; Riparian Rights; Quantification Settlement Agreement — watereducation.org

National Audubon Society v. Superior Court (1983) — law.justia.com

National Agricultural Law Center / Congressional Research Service — Indian Reserved Water Rights Under the Winters Doctrine — nationalaglawcenter.org

Grantham & Viers — 100 years of California's water rights system, Environmental Research Letters (2014); UC Davis news release — ucdavis.edu

Hanson Bridgett — State Water Board reporting requirements for riparian and pre-1914 right owners — hansonbridgett.com

California State Water Resources Control Board — Water Rights Process; Statement of Water Diversion and Use program; Ocean Plan Desalination Provisions — waterboards.ca.gov

Federal & State Projects, Pricing, Use

U.S. Bureau of Reclamation — Central Valley Project; CVP irrigation water rates — usbr.gov

Wikipedia — California State Water Project — en.wikipedia.org

Public Policy Institute of California — Water Use in California; Tribal Water Rights in California — ppic.org

CalMatters — California cities pay a lot for water; some agricultural districts get it for free; Colorado River deal — calmatters.org

Reform Precedents & Markets

Imperial Irrigation District — QSA Water Transfer — iid.com

Palo Verde Irrigation District — MWD fallowing program — pvid.org

Modern Farmer — At Last, States Reach a Colorado River Deal: Pay Farmers Not to Farm — modernfarmer.com

Environmental Defense Fund — Groundwater pumping allocations under SGMA — edf.org

Agri-Pulse — Groundwater trading sees interest but markets remain mostly stalled — agri-pulse.com

Legal Planet — California enacts major water law reform legislation — legal-planet.org

K&L Gates — California's 2023 legislative proposal highlights (AB 460, AB 1337, SB 389) — klgates.com

Capistrano Taxpayers Association v. City of San Juan Capistrano (2015); Allen Matkins analysis — caselaw.findlaw.com, allenmatkins.com

Wheeler et al. — Murray–Darling Basin Plan water recovery programs, Australian Journal of Public Administration; Australian DCCEEW water purchasing — onlinelibrary.wiley.com, dcceew.gov.au

Wikipedia, "Water scarcity in Israel." en.wikipedia.org/wiki/Water_scarcity_in_Israel ↩︎
Blackridge Research, "Latest List of Top 5 Desalination Plants in Israel [2026]." blackridgeresearch.com/blog/latest-list-of-top-largest-biggest-desalination-desal-water-treatment-plants-projects-israel; Times of Israel, "Desalination plant in central region goes into full operation." timesofisrael.com ↩︎
Blackridge Research, Sorek and Ashkelon project profiles; Wikipedia, "Water supply and sanitation in Israel." en.wikipedia.org/wiki/Water_supply_and_sanitation_in_Israel ↩︎
Click Petróleo e Gás, "Israel produces 624 million liters of desalinated water per day at US$0.70 per thousand liters"; Carlsbad cost figures per Desalination Part I, Section II, this series. ↩︎
MDPI, "Addressing Desalination's Carbon Footprint: The Israeli Experience," Water 10(2):197. mdpi.com/2073-4441/10/2/197; European Investment Bank, "Sorek alleviates Israel's water shortage." eib.org ↩︎
MDPI, "Key Environmental Impacts along the Mediterranean Coast of Israel." mdpi.com/2077-1312/11/1/2; American Chemical Society, "Impacts of Desalination Brine Discharge on Benthic Ecosystems," Environmental Science & Technology. pubs.acs.org/doi/10.1021/acs.est.3c07748; PLOS One, "The effect of long-term brine discharge from desalination plants on benthic foraminifera." journals.plos.org ↩︎
Springer, "Impingement and Entrainment at SWRO Desalination Facility Intakes." link.springer.com/chapter/10.1007/978-3-319-13203-7_4; ScienceDirect, "Boron removal from seawater: State-of-the-art review"; ScienceDirect, "Remineralization of desalinated water: Methods and environmental impact." ↩︎
California State Water Resources Control Board, Ocean Plan Desalination Provisions, supra Part I note 2; 23 CCR § 3009. law.cornell.edu/regulations/california/23-CCR-3009 ↩︎
EcoFlow, "GHG Emissions per kWh: Coal, Gas, Wind & Solar"; IOPscience, "Evaluating net life-cycle greenhouse gas emissions intensities from gas and coal at varying methane leakage rates," Environmental Research Letters. iopscience.iop.org/article/10.1088/1748-9326/ace3db; MDPI, supra note 5 (1.4–1.8 kg CO₂ per m³). ↩︎
International Energy Agency, "Global Methane Tracker 2025." iea.org/reports/global-methane-tracker-2025/key-findings ↩︎
Water Law, 5719-1959, UNEP Law and Environment Assistance Platform. leap.unep.org/en/countries/il/national-legislation/water-law-5719-1959; University of Arizona Water Resources Research Center, "Israel's Public Ownership of Water Said to Offer Advantages Over Prior Appropriation." wrrc.arizona.edu/awr/f09/ownership ↩︎
Green Prophet, "Water allocation, irrigation efficiency, rationing and pricing in Israel: what can we learn?" greenprophet.com/2023/12/water-allocation-irrigation-efficiency-rationing-israel/ ↩︎
Green Prophet, supra note 12; OECD, "Israel's sustainable water management plans." oecd.org ↩︎
Times of Israel, "Government amends Water Law to cut price for farmers." timesofisrael.com; Jerusalem Post, "NIS 3.5B for Israel's water revolution." jpost.com ↩︎
farmdoc daily, "Conservation Quandaries, Part 2: Water Law" (2025). farmdocdaily.illinois.edu; Waterkeeper, "Prior Appropriation and Water in the West." waterkeeper.org ↩︎
California Water Code §§ 1010, 1011, 1011.5. california.public.law/codes/water_code_section_1011 ↩︎
California Constitution, Article X, Section 2; California State Water Resources Control Board, "The Reasonable Use Doctrine & Agricultural Water Use Efficiency." waterboards.ca.gov ↩︎
Water Education Foundation, "Appropriative Rights" and "Riparian Rights." watereducation.org; Wikipedia, "Water Commission Act of 1913"; National Audubon Society v. Superior Court (1983), law.justia.com/cases/california/supreme-court/3d/33/419.html; National Agricultural Law Center / CRS, "Indian Reserved Water Rights Under the Winters Doctrine." ↩︎
Grantham, T. & Viers, J., "100 years of California's water rights system," Environmental Research Letters (2014); UC Davis, "California has given away rights to far more water than it has." ucdavis.edu/news/california-has-given-away-rights-far-more-water-it-has ↩︎
Hanson Bridgett, "State Water Resources Control Board Requires Additional Reporting by Riparian and Pre-1914 Water Right Owners" (2015). hansonbridgett.com; California State Water Resources Control Board, Statement of Water Diversion and Use program. waterboards.ca.gov ↩︎
California State Water Resources Control Board, "Water Rights Process." waterboards.ca.gov/waterrights/board_info/water_rights_process.html ↩︎
U.S. Bureau of Reclamation, "Central Valley Project." usbr.gov/mp/cvp/; Wikipedia, "California State Water Project." en.wikipedia.org/wiki/California_State_Water_Project ↩︎
National Agricultural Law Center / CRS, supra note 18; Public Policy Institute of California, "Tribal Water Rights in California," supra Part II note 15. ↩︎
Public Policy Institute of California, "Water Use in California." ppic.org/publication/water-use-in-california/ ↩︎
Environmental Defense Fund, "Groundwater Pumping Allocations under California's SGMA." edf.org; Agri-Pulse, "Groundwater trading sees interest — but markets remain mostly stalled." agri-pulse.com ↩︎
Capistrano Taxpayers Association, Inc. v. City of San Juan Capistrano (2015), caselaw.findlaw.com; Allen Matkins, "Progressively Tiered Water Rates to Promote Conservation May Violate Proposition 218." allenmatkins.com ↩︎
Legal Planet, "California Enacts Major Water Law Reform Legislation — But More Changes Are Needed" (2023). legal-planet.org; K&L Gates, "Water Regulation in the Western States: California's 2023 Legislative Proposal Highlights" (AB 460, AB 1337, SB 389). klgates.com ↩︎
Water Education Foundation, "Quantification Settlement Agreement." watereducation.org; Imperial Irrigation District, "QSA — Water Transfer." iid.com/water/library/qsa-water-transfer ↩︎
Palo Verde Irrigation District, "MWD Program." pvid.org/mwdprogram.php ↩︎
CalMatters, "Colorado River deal: What does it mean for California?" (May 2023). calmatters.org; Modern Farmer, "At Last, States Reach a Colorado River Deal: Pay Farmers Not to Farm." modernfarmer.com ↩︎
Wheeler, S. et al., "Comparing the success and failure of the Murray–Darling Basin Plan's water recovery programs," Australian Journal of Public Administration. onlinelibrary.wiley.com/doi/10.1111/1467-8500.12672; Australian Department of Climate Change, Energy, the Environment and Water, "Australian Government water purchasing in the Murray–Darling Basin." dcceew.gov.au ↩︎

Desalination in California, Part II: Who's at the Table

Fri, 26 Jun 2026 00:00:00 GMT

Desalination in California, Part II:

Who's at the Table

A Water Policy Series — June 2026

Introduction

The first article in this series established that desalination and managed aquifer recharge fail under opposite conditions — desalination is expensive and ecologically costly but precipitation-independent; MAR is cheap and ecologically generative but useless in the multi-year droughts that matter most. A sensible portfolio uses both, in proportion. The question this article asks is simple and largely unanswered in California's water policy: who actually decides that proportion? The answer is no one, in any accountable, enforceable sense — and the gap left by that absence is filled by a specific, unequal set of actors whose incentives don't line up with each other, governed by agreements that are renegotiated in crisis rather than adjusted continuously.

I. The Governance Gap

No single body sets a statewide ratio of desalination to recharge. The proportion that actually emerges is the byproduct of three semi-independent layers. At the state level, the Department of Water Resources and the Natural Resources Agency publish framing documents — the Water Resilience Portfolio and the Water Supply Strategy — that set out aspirational sequencing (recharge, recycling, and conservation before desalination) but do not bind any local agency to follow it.^[1] The real lever is funding: the 2014 Proposition 1 water bond funds both a Desalination Grant Program, which has awarded roughly $123 million across 65 projects, and a Sustainable Groundwater Management Grant Program, through which DWR has allocated more than $500 million for recharge planning and implementation.^[2] Whichever program receives more money in a given budget cycle tilts the statewide balance — a legislative appropriations decision, not a hydrological one. The State Water Resources Control Board adds a second, asymmetric layer of friction: the Ocean Plan's Desalination Provisions make seawater plants categorically harder and slower to permit, while SGMA implementation effectively requires groundwater sustainability agencies to pursue recharge as a matter of course.^[3]

The decisions that actually build or kill a plant happen locally. Individual water district boards — South Coast Water District for Doheny, the San Diego County Water Authority for Carlsbad — vote to build and negotiate the contracts, with public rate-setting hearings as the primary accountability mechanism, while the Coastal Commission and State Lands Commission function as centralized veto points that have no equivalent on the recharge side.^[4] Groundwater Sustainability Agencies, created under SGMA, make the parallel decisions for MAR — and their boards typically include not just elected representatives of member water districts but an appointed agricultural groundwater user and a non-agricultural domestic well user, both named by county boards of supervisors.^[5] That detail matters more than it first appears: agriculture has a formal seat at the table for recharge decisions in a way it structurally does not for desalination siting, which runs through coastal and municipal bodies where agricultural voices rarely appear at all.

II. Best and Worst Outcomes

The evidence on which governance model actually works is lopsided. California's groundwater sustainability agencies collectively reported an average of 2.5 million acre-feet of managed recharge a year across 2022–2024, across more than 1,500 projects statewide.^[6] The Pajaro Valley Water Management Agency, managing its basin since 1984 — a decade longer than SGMA itself has existed — runs a Recharge Net Metering program that pays landowners to dedicate farmland to aquifer recharge, and recently won an $8.89 million state grant to tie recharge directly to habitat restoration.^[7] In Kern County, twenty separate groundwater sustainability agencies coordinate conjunctive-use programs that bank wet-year surface water underground for drought-year recovery — the clearest working example of interagency cooperation functioning at scale rather than fragmenting.^[8]

The comparable flagship on the desalination side is harder to point to with pride. Doheny is the procedural model — careful aquifer modeling, subsurface intake, a clean 2026 federal sign-off — but it has no operating record; it won't open until roughly 2029. Carlsbad, the only large-scale plant with a multi-year track record, is the plant now associated with ratepayer cost overruns and the $35 million take-or-pay dispute described in the first article.^[9] The recharge side has multiple decades-proven, multi-stakeholder successes to point to. Desalination's flagship example is also its main cautionary tale.

III. The Stakeholders

Legislators. The most concrete recent action is SB 72, chaptered in October 2025, which writes the portfolio framing into statute by requiring DWR's California Water Plan to address storage, recycling, desalination, conjunctive use, and transfers together, and which expands the Plan's advisory committee to formally include Tribes, labor, and environmental justice representatives for the first time.^[10] The bill also requires DWR to set an interim 2050 planning target accounting for urban, agricultural, tribal, and environmental beneficial uses as co-equal categories. The legislature is not picking a winner between desalination and recharge; it is formalizing who gets a say in the choice.

Agriculture. The sector's position on desalination is close to unanimous, and the reasoning is arithmetic. Desalting brackish groundwater for crop use costs roughly $800 an acre-foot, while many farmers holding senior water rights pay as little as $3 an acre-foot for fresh surface water.^[11] A PPIC agricultural economist put it bluntly: desalination is "a nice solution that's appropriate in some contexts, but for agriculture it's hard to justify, frankly."^[12] California's actual agricultural investment points the other way — $110 million over three years to repurpose farmland toward groundwater recharge and habitat restoration, paying farmers to host the infrastructure MAR depends on rather than subsidizing a technology they can't afford to use.^[13] A related asymmetry worth naming: California cities routinely pay far more for water than agricultural districts, some of which receive water at little or no cost under senior pre-1914 rights — meaning the sector best insulated from desalination's cost premium is also the sector least exposed to paying for it.^[14]

Tribes. This is the clearest unmet stakeholder claim in California's water system. More than thirty California Tribes hold state water rights or water rights claims to surface water and groundwater, but only sixteen have ever had those rights formally quantified, and few Tribes have chosen to participate in the SGMA process despite a legal requirement that lead agencies consult with Tribes before approving groundwater recharge and diversion projects.^[15] The consultation requirement that exists runs through the recharge side of the system; there is no comparable tribal consultation infrastructure built into desalination's coastal permitting process, though pending 2024 amendments to the Ocean Plan's desalination provisions list tribal engagement as a topic under discussion.^[16] Recent funding responses — a $15 million tribal water supply agreement, an Underrepresented Communities Groundwater Technical Assistance Program, $100 million for a Tribal Nature-Based Solutions Program that has returned roughly 103,000 acres of ancestral land — are real but address land and technical capacity more than the underlying water-rights gap.^[17] SB 72's new advisory seat is a process opening, not yet a demonstrated outcome.

Municipalities. Cities occupy the most exposed position in the whole system. They are the primary advocates for desalination's drought-proofing case, the parties that actually fund and contract for it, and the parties whose ratepayers absorb the bill and the political backlash when costs run over — the San Diego rate increases and the Carlsbad take-or-pay dispute land squarely on municipal water boards, not on the state.^[18] Those same boards also run the full desalination permitting gauntlet — Coastal Commission, State Lands Commission, CEQA — a regulatory and litigation burden that groundwater sustainability agencies pursuing recharge largely do not face to the same degree.

IV. The Same Problem, Larger Scale

Zoom out from California's internal politics and the pattern repeats at every larger scale, which suggests the desalination-versus-recharge debate is a symptom of something underneath it rather than the root problem itself.

Within the state, the central fault line remains Delta exports — Northern California water moving south to both San Joaquin Valley agriculture and Southern California cities. A $2.9 billion voluntary agreement backed by Governor Newsom and major urban and agricultural suppliers proposes letting water users fund habitat restoration and forgo some water in place of hard regulatory flow mandates; environmental groups say it trades away too much protection for too little water.^[19] The $20 billion Delta Conveyance tunnel is itself a flashpoint for the same reason — its costs and disruption are borne by Delta communities while its benefits accrue to water users hundreds of miles away.^[20] Agriculture is being squeezed from two directions simultaneously: pressured to reduce San Joaquin River diversions to help Delta flows, and required under SGMA to reduce groundwater pumping because overdraft is causing land subsidence — which is precisely why the state's farmland-to-recharge funding functions as a release valve rather than a pure mandate.^[13:1] A concrete 2025–2026 flashpoint: Central Valley Project contractors south of the Delta were allocated only 15 percent of their contracted supply, an allocation agricultural groups and legislators have publicly argued doesn't reflect actual hydrologic conditions.^[21]

One level up, California's two largest water systems can't fully coordinate with each other. The federal Central Valley Project and the state State Water Project draw from many of the same Delta sources under a 1986 Coordinated Operations Agreement that Reclamation and DWR reviewed and failed to agree on revising back in 2015 — a disagreement that has simply persisted rather than resolved.^[22] Worse, the rules governing that coordination have been reset by each of the past seven federal administrations, meaning two of California's largest water systems operate under terms that shift with national electoral politics rather than the state's own planning cycle. The underlying scarcity explains why the disagreement is so intractable: the Delta system holds roughly 29 million acre-feet of consumptive water in an average year against 153.7 million acre-feet of filed consumptive water rights claims — more than five times oversubscribed — and CVP and SWP both hold comparatively junior rights in that competition.^[23] PPIC has proposed unifying the two projects outright, removing the federal-state seam rather than continuing to negotiate around it.^[24]

One level above that, the same structure is playing out on the Colorado River, on a much larger stage and a much tighter deadline. The 2007 Interim Guidelines, the 2019 Drought Contingency Plans, and the related U.S.-Mexico agreements all expire at the end of 2026, with a finalized replacement plan expected this spring — arriving in the same hydrologic year experts are calling the worst on record for the river.^[25] Lower Basin states, including California, want Upper Basin states to share mandatory drought cuts; Upper Basin states refuse, noting they already use less than their full legal allocation while the river has shrunk roughly 20 percent over the past 25 years from climate-driven aridification.^[26] Arizona, California, and Nevada reached a 2026 bridge agreement to cut collective use by at least 3.2 million acre-feet through 2028, split unevenly — 27 percent, 17 percent, and 10 percent respectively, reflecting California's comparatively senior legal position on the river.^[27] Notably, desalination itself has entered this interstate conversation at a scale far beyond anything in California's own portfolio: a Gulf of California seawater desalination import platform and a Salton Sea brackish desalination and restoration concept are both under live evaluation as basin-wide "demand relief" tools.^[28]

Conclusion

The same diagnosis recurs at every scale examined here: multiple actors holding competing legal claims to a shrinking, oversubscribed resource, governed by agreements renegotiated in periodic crises rather than adjusted continuously, with no single body accountable for the overall balance. California's desalination-versus-recharge proportion isn't an exception to that pattern — it's the smallest-scale instance of it, decided by which grant program gets more money and which local board happens to act first, rather than by the state's own stated sequencing logic. The final article in this series asks what follows from that diagnosis, and what, short of building still more parallel infrastructure, California could actually do about it.

Footnotes

Sources

Governance & Funding

California Department of Water Resources — Water Resilience Portfolio, Desalination Grant Program, Sustainable Groundwater Management Grant Program, Groundwater Sustainability Agencies — water.ca.gov

California State Water Resources Control Board — Ocean Plan Desalination Provisions, SGMA overview — waterboards.ca.gov

CalMatters Digital Democracy / LegiScan — SB 72 bill text and tracking

Local Agency Case Studies

Pajaro Valley Water Management Agency — pvwater.org

UC Berkeley Law — Recharge Net Metering (ReNeM) — law.berkeley.edu

Kern County Water Agency — Kern Groundwater Authority — kcwa.com

Stakeholder Reporting

Knowable Magazine — Can desalination quench agriculture's thirst? — knowablemagazine.org

CalMatters — California cities pay a lot for water; Delta water wars; Delta tunnel reporting — calmatters.org

Public Policy Institute of California — Tribal Water Rights in California; Tribal Water Rights and Water Use in California; Uniting CVP and SWP — ppic.org

Association of California Water Agencies — Tribe, Water Districts Reach Water Rights Settlement — acwa.com

California WaterBlog — Bargaining for Tribal Water in California — californiawaterblog.com

Farm Progress — California ag, lawmakers rip meager CVP water allocation — farmprogress.com

Interstate / Interagency

Congressional Research Service — Central Valley Project: Issues and Legislation; Management of the Colorado River — congress.gov

U.S. Bureau of Reclamation — Colorado River Post 2026 Operations — usbr.gov

Colorado Sun — Feds release draft report on Colorado River's future — coloradosun.com

High Country News — Why Colorado River negotiations are so difficult — hcn.org

Environmental Defense Fund — Arizona, California and Nevada reached a new Colorado River deal — blogs.edf.org

Maven's Notebook — Colorado River post-2026 operations — mavensnotebook.com

California Natural Resources Agency, Water Resilience Portfolio. resources.ca.gov/Initiatives/Building-Water-Resilience/portfolio; California Department of Water Resources, Water Supply Strategy. ↩︎
California Department of Water Resources, "Water Desalination Grant Program." water.ca.gov/Work-With-Us/Grants-And-Loans/desalination-Grant-Program; California Department of Water Resources, "Sustainable Groundwater Management Grant Program." water.ca.gov/work-with-us/grants-and-loans/sustainable-groundwater ↩︎
California State Water Resources Control Board, Ocean Plan Desalination Provisions, supra Part I note 2; California State Water Resources Control Board, "What is SGMA?" waterboards.ca.gov/water_issues/programs/sgma/about_sgma.html ↩︎
South Coast Water District; San Diego County Water Authority rate and contract records, supra Part I notes 1, 10. ↩︎
California Department of Water Resources, "Groundwater Sustainability Agencies." water.ca.gov/Programs/Groundwater-Management/SGMA-Groundwater-Management/Groundwater-Sustainable-Agencies ↩︎
California Department of Water Resources, "Local Agencies Across California Continue Advancements Toward Groundwater Sustainability" (March 2026). water.ca.gov/News/News-Releases/2026/Mar-2026/Local-Agencies-Across-California-Continue-Advancements-Toward-Groundwater-Sustainability ↩︎
Pajaro Valley Water Management Agency, "Sustainable Ground Water Management In The Pajaro Valley." pvwater.org/sgm; UC Berkeley Law, "Recharge Net Metering to Enhance Groundwater Sustainability." law.berkeley.edu/research/clee/research/wheeler/renem/ ↩︎
Kern County Water Agency, "Kern Groundwater Authority." kcwa.com/kerngroundwaterauthority/ ↩︎
Voice of San Diego, supra Part I note 10. ↩︎
CalMatters Digital Democracy, "SB 72: The California Water Plan: long-term supply targets." calmatters.digitaldemocracy.org/bills/ca_202520260sb72; LegiScan, Bill Text CA SB72 (Chaptered). legiscan.com/CA/text/SB72/id/3271508 ↩︎
Knowable Magazine, "Can desalination quench agriculture's thirst?" (November 2024). knowablemagazine.org/content/article/food-environment/2024/can-desalination-of-groundwater-grow-crops ↩︎
Knowable Magazine, supra note 11, quoting Brad Franklin, Public Policy Institute of California. ↩︎
Knowable Magazine, supra note 11. ↩︎ ↩︎
CalMatters, "California cities pay a lot for water; some agricultural districts get it for free" (December 2025). calmatters.org/environment/2025/12/price-of-california-water-cities-growers/ ↩︎
Public Policy Institute of California, "Tribal Water Rights in California." ppic.org/publication/tribal-water-rights-in-california/; "Tribal Water Rights and Water Use in California." ppic.org/publication/tribal-water-rights-and-water-use-in-california/ ↩︎
California State Water Resources Control Board, 2024 desalination provisions scoping materials, supra Part I note 2. ↩︎
Association of California Water Agencies, "Tribe, Water Districts Reach Water Rights Settlement." acwa.com/news/tribe-water-districts-reach-water-rights-settlement/; California WaterBlog, "Bargaining for Tribal Water in California" (July 2025). californiawaterblog.com/2025/07/27/bargaining-for-tribal-water-in-california/ ↩︎
San Diego Coastkeeper; Voice of San Diego, supra Part I notes 9, 10. ↩︎
CalMatters, "Key player in Sacramento River Delta water wars embraces pact" (July 2025). calmatters.org/environment/2025/07/sacramento-river-delta-report/ ↩︎
CalMatters, "California's $20 billion Delta water tunnel strikes fear in locals" (March 2025). calmatters.org/environment/water/2025/03/california-delta-tunnel-residents-fear/ ↩︎
Farm Progress, "California ag, lawmakers rip meager CVP water allocation." farmprogress.com/farm-policy/california-ag-lawmakers-rip-meager-cvp-water-allocation ↩︎
Public Policy Institute of California, "Uniting the Central Valley Project and the State Water Project Would Benefit All Water Users." ppic.org/blog/uniting-the-central-valley-project-and-the-state-water-project-would-benefit-all-water-users/ ↩︎
Congressional Research Service, "Central Valley Project: Issues and Legislation." congress.gov/crs-product/R45342; PPIC, supra note 22. ↩︎
PPIC, supra note 22. ↩︎
U.S. Bureau of Reclamation, "Colorado River Post 2026 Operations." usbr.gov/ColoradoRiverBasin/post2026/index.html; Colorado Sun, "Feds release draft report outlining management plans for Colorado River's future" (January 2026). coloradosun.com/2026/01/09/colorado-river-plan/ ↩︎
High Country News, "Why Colorado River negotiations are so difficult." hcn.org/articles/why-colorado-river-negotiations-are-so-difficult/ ↩︎
Environmental Defense Fund, "Arizona, California and Nevada reached a new Colorado River deal. What comes next?" (May 2026). blogs.edf.org/waterfront/2026/05/07/arizona-california-nevada-reached-new-colorado-river-deal/ ↩︎
Maven's Notebook, "COLORADO RIVER: Post-2026 operations: Lower Basin proposal and next steps" (May 2026). mavensnotebook.com/2026/05/13/colorado-river-post-2026-operations-lower-basin-proposal-and-next-steps/ ↩︎

Desalination in California, Part III: What California Actually Needs

Fri, 26 Jun 2026 00:00:00 GMT

Desalination in California, Part III:

What California Actually Needs

A Water Policy Series — June 2026

Introduction

The first article in this series established the technical baseline: desalination is the most expensive water supply tool California has, ecologically costly in ways that require active mitigation, and a structurally small contributor to the volume the state needs — but it is the one major tool that does not fail when the rain stops, which managed aquifer recharge, its cheapest and most ecologically generative rival, fundamentally does. The second traced who actually decides how much of each tool gets built, and found no one does, in any accountable sense — the proportion emerges from fragmented grant funding, asymmetric permitting friction, and which local board or private developer happens to act first, with the same pattern of fragmented, crisis-driven governance recurring at every larger scale, up through the Central Valley Project's unresolved coordination dispute with the State Water Project and the Colorado River's live, deadline-bound 2026 renegotiation. This article asks what follows from that diagnosis.

I. The Narrow Case for Desalination, Restated

It is worth being precise about what desalination's justification actually is, because the loose version of the argument — "California needs more water, and the ocean is right there" — does not survive the first article's numbers. A dozen Carlsbad-scale plants, an enormous and decades-long undertaking, would supply less than a tenth of the state's projected 2040 supply gap, at two to six times the cost of every serious alternative.^[1] That is not the argument for desalination. The argument is narrower and more defensible: managed aquifer recharge, recycling, conservation, and stormwater capture are all correlated with the same precipitation signal that climate change is making less reliable, and in California's last sustained multi-year drought, the state recovered less than a third of what it lost and, even in the wet years immediately following, recharged only about a fifth of the remaining overdraft.^[2] Desalination's water supply does not depend on that signal. Its case is as a deliberately small, deliberately expensive insurance layer against exactly the years when every other tool in the portfolio runs dry at once — not as a primary lever, and not at the scale or cost structure California has so far built it.

II. The Gap Between Stated Policy and Actual Practice

California's own Water Supply Strategy already states the correct sequencing: conservation, recycling, and stormwater and groundwater recharge first; desalination last, as a costly tool reserved for circumstances nothing else can address.^[3] If the state were actually following that sequencing, the second article's findings would look different. They do not. Huntington Beach was pursued for years, and ultimately killed, not because a state body determined the Orange County coast needed fifty million gallons a day of drought insurance, but because a private developer identified a permitting pathway and a local market and pursued it.^[4] Carlsbad exists, and now binds San Diego County ratepayers to a fixed annual purchase through 2045 regardless of need, because a county water authority signed a contract whose long-term financial terms outlasted the drought conditions that motivated it.^[5] Neither outcome reflects the state's stated logic. Both reflect what a private contractor could get a local board to agree to.

This is the sharper version of the critique this series has been building toward. The honest complaint about California's desalination program is not that desalination is inherently wrong, or that the technology should be abandoned — Doheny's subsurface intake design and careful aquifer modeling show the technology can be deployed with real care.^[6] The honest complaint is that the proportion of desalination California has built bears only a loose relationship to the proportion its own water plan says it should have, because nothing enforces that plan's sequencing on the local boards and private developers who actually decide whether a plant gets built. The Ocean Plan regulates how a desalination plant must be built. Nothing regulates how many California should have, relative to the cheaper, more generative alternatives sitting beside it on every cost comparison in the state's own literature.

III. Symptom, Not Cause

The second article's wider lens matters here, because it shows that this is not a failure unique to desalination policy. The Central Valley Project and the State Water Project have operated under an unresolved coordination disagreement since 2015, reset by seven consecutive federal administrations, governing a Delta system that is oversubscribed by water-rights claims more than five times over.^[7] The Colorado River's governing guidelines expire at the end of this year, in the worst hydrologic year on record for the basin, with Upper and Lower Basin states still disputing who absorbs climate-driven cuts to a river that has shrunk twenty percent in twenty-five years.^[8] At every scale examined in this series — a single coastal water district, the state's two largest conveyance systems, an entire interstate river basin — the same structure recurs: multiple actors holding legally enforceable claims to a shrinking, oversubscribed resource, governed by agreements renegotiated in periodic crisis rather than adjusted continuously, with no single body accountable for the aggregate result.

Read this way, desalination and managed aquifer recharge are not really competing answers to "how does California get more water." They are two of the ways individual actors respond to a system that will not reliably deliver water through its shared channels. Coastal and Southern California urban agencies build desalination plants because winning the annual Delta-export fight is not guaranteed and building a local, weather-independent supply removes that uncertainty, whatever its cost.^[9] Inland and Central Valley agricultural interests lean toward recharge because they already hold the land and aquifer access SGMA requires them to use, and because the state is actively paying them to repurpose acreage toward it as surface diversions are curtailed.^[10] Each choice is locally rational. Neither is being weighed against the other by anyone positioned to weigh the whole system — which is exactly why California keeps building expensive, parallel, single-purpose infrastructure instead of fixing the shared system underneath it.

IV. What Would Actually Move the Needle

The fixes already proposed by the people closest to each layer of this problem point in a consistent direction: toward governance and coordination, not new construction. The Public Policy Institute of California has proposed unifying the Central Valley Project and the State Water Project outright, eliminating the federal-state operational seam that neither agency has been able to resolve through negotiation since 2015.^[11] On the Colorado River, the Upper Basin's "supply-driven operations" proposal — tying reservoir releases directly to measured hydrologic conditions rather than fixed contractual entitlements — would replace the current cycle of crisis renegotiation with something closer to an automatic, continuously adjusting rule.^[12] Within California, SB 72's expansion of the Water Plan's advisory committee to formally include Tribes, labor, and environmental justice representatives, and its requirement that DWR set a 2050 planning target treating tribal, agricultural, urban, and environmental uses as co-equal categories, is a modest but real step toward a process that actually weighs competing claims against each other rather than letting whichever board acts first set the outcome by default.^[13]

None of these fixes require a single new treatment plant or recharge basin. They require California, and the federal government, to spend governance effort on the seams between water systems rather than only on the systems themselves — the same kind of investment, in different currency, that the state has already been willing to make in concrete and steel. The clearest failure in this series is not that California built a desalination plant it didn't strictly need at Carlsbad, or that managed aquifer recharge can't reach a drought it wasn't built to reach. It is that the state has a stated, sensible answer for how much of each it should build, and no mechanism that connects that answer to what actually gets approved, financed, and operated on the ground.

Conclusion

California does not lack ideas for closing its water gap. It has a state water plan that correctly sequences cheap, multi-benefit tools ahead of expensive, narrow ones; a desalination technology that, deployed carefully, can avoid its worst ecological costs; a recharge strategy with genuine multi-decade success stories to draw on; and, increasingly, a legislative process willing to widen who gets a voice in the decision. What it lacks is a structure that makes any of that binding on the local boards, private contractors, and competing agencies who actually build things — the same structural gap that shows up, at larger scale, in the unresolved seam between its two biggest conveyance systems and in the interstate river negotiation now running up against a 2026 deadline. The tools to close California's water gap, in something close to the proportion the state's own strategy already recommends, exist. What is missing is not technology, and not money. It is a governance structure capable of deploying the tools it already has as a coordinated system, rather than as a series of separately negotiated, locally rational bets.

Footnotes

Sources

This Series

Desalination in California, Part I: The Scope of the Problem

Desalination in California, Part II: Who's at the Table

Policy & Governance

CalMatters — How can California boost its water supply?; A salty dispute — calmatters.org

Public Policy Institute of California — Uniting the Central Valley Project and the State Water Project Would Benefit All Water Users — ppic.org

Congressional Research Service — Central Valley Project: Issues and Legislation — congress.gov

U.S. Bureau of Reclamation — Colorado River Post 2026 Operations — usbr.gov

High Country News — Why Colorado River negotiations are so difficult — hcn.org

Maven's Notebook — Colorado River post-2026 operations: Lower Basin proposal and next steps — mavensnotebook.com

CalMatters Digital Democracy — SB 72 bill tracking — calmatters.digitaldemocracy.org

Reporting

Voice of San Diego — San Diegans Owe a Desal Company $35 million for Unmade Water — voiceofsandiego.org

South Coast Water District — Doheny Ocean Desalination Project — scwd.org

Knowable Magazine — Can desalination quench agriculture's thirst? — knowablemagazine.org

Desalination Part I: The Scope of the Problem, Section III, this series. ↩︎
Desalination Part I: The Scope of the Problem, Section V, this series, citing Alam et al., Water Resources Research (2020, 2021). ↩︎
CalMatters, "How can California boost its water supply?" calmatters.org/explainers/california-water-solutions/ ↩︎
CalMatters, "A salty dispute: California Coastal Commission unanimously rejects desalination plant" (May 2022). calmatters.org/environment/2022/05/california-desalination-plant-coastal-commission/ ↩︎
Voice of San Diego, "San Diegans Owe a Desal Company $35 million for Unmade Water" (September 2025). voiceofsandiego.org/2025/09/22/san-diegans-owe-a-desal-company-35-million-for-unmade-water/ ↩︎
South Coast Water District, "Doheny Ocean Desalination Project." scwd.org/about/district_projects/doheny_ocean_desalination_project/index.php ↩︎
Public Policy Institute of California, "Uniting the Central Valley Project and the State Water Project Would Benefit All Water Users." ppic.org/blog/uniting-the-central-valley-project-and-the-state-water-project-would-benefit-all-water-users/; Congressional Research Service, "Central Valley Project: Issues and Legislation." congress.gov/crs-product/R45342 ↩︎
U.S. Bureau of Reclamation, "Colorado River Post 2026 Operations." usbr.gov/ColoradoRiverBasin/post2026/index.html; High Country News, "Why Colorado River negotiations are so difficult." hcn.org/articles/why-colorado-river-negotiations-are-so-difficult/ ↩︎
Desalination Part II: Who's at the Table, Section IV, this series. ↩︎
Knowable Magazine, "Can desalination quench agriculture's thirst?" (November 2024). knowablemagazine.org/content/article/food-environment/2024/can-desalination-of-groundwater-grow-crops ↩︎
Public Policy Institute of California, supra note 7. ↩︎
Maven's Notebook, "COLORADO RIVER: Post-2026 operations: Lower Basin proposal and next steps" (May 2026). mavensnotebook.com/2026/05/13/colorado-river-post-2026-operations-lower-basin-proposal-and-next-steps/ ↩︎
CalMatters Digital Democracy, "SB 72: The California Water Plan: long-term supply targets." calmatters.digitaldemocracy.org/bills/ca_202520260sb72 ↩︎

Desalination in California, Part I: The Scope of the Problem

Fri, 26 Jun 2026 00:00:00 GMT

Desalination in California, Part I:

The Scope of the Problem

A Water Policy Series — June 2026

Introduction

Twelve miles apart on the Orange County coast sit two desalination projects that tell opposite stories. In Huntington Beach, a fifty-million-gallon-a-day plant proposed by Poseidon Resources was unanimously killed by the California Coastal Commission in May 2022. In Dana Point, a smaller, five-million-gallon-a-day plant called Doheny cleared its final federal environmental review in March 2026 and is on track to open by 2029. Same coastline, same state regulators, same general technology — opposite outcomes. Understanding why requires understanding what desalination actually costs, what it actually produces, and what it is actually being asked to solve. This is the baseline the rest of this series builds on.

I. Two Plants, One Dividing Line

Huntington Beach proposed an open intake pipe drawing water directly from the ocean. Doheny uses subsurface slant wells — buried beneath the seafloor, filtering seawater through sediment before it ever reaches a pump.^[1] That single design choice decided both projects' fates. California's Ocean Plan, amended in 2015 to add statewide Desalination Provisions, makes subsurface intake the default-required technology unless a developer can show it isn't feasible.^[2] Open intakes kill and injure marine life through two mechanisms: impingement, where fish are trapped against intake screens, and entrainment, where eggs, larvae, and plankton are drawn into the system and destroyed. The State Water Board has used the impact data from an adjacent open-intake power plant as a proxy to quantify exactly how much fish biomass an open-intake desal plant would cost a local population — and at Huntington Beach, that cost, combined with sea-level rise flooding risk at the proposed site, was enough to sink the project.^[3]

The operating precedent — the Claude "Bud" Lewis Carlsbad plant, the nation's largest, online since 2015 — never had to clear this particular bar; it uses open intake and instead pays for the resulting harm after the fact, funding roughly 150,000 square meters of wetland restoration in the adjacent Agua Hedionda Lagoon as ecological compensation.^[4] That distinction matters for how the rest of this series treats desalination's environmental cost: it is not a fixed cost of the technology, but a cost that regulators have learned to push toward prevention (subsurface intake) rather than compensation (wetland offsets) — at the price of a far more demanding permitting process.

II. What It Costs

Desalination is, by a wide and consistent margin, the most expensive water supply option California has. Carlsbad's water runs $3,400 to roughly $4,000 per acre-foot; Doheny is projected at about $2,058 per acre-foot in its first year, cheaper but still well above conventional supply.^[5] Compare that to the alternatives: stormwater capture costs as little as $0.48 per cubic meter for large projects; conservation and efficiency programs run $600–$1,800 per acre-foot; wastewater recycling for indirect potable reuse runs roughly $700–$1,200 per acre-foot net in San Diego's own estimates; and managed aquifer recharge runs about $1,200 per acre-foot on a capital basis.^[6] Desalination is two to six times more expensive than every one of them. California's own official Water Supply Strategy reflects this ranking explicitly, sequencing recycling and stormwater capture ahead of desalination and treating desal as a last-resort tool rather than a first choice.^[7]

The ratepayer consequence is concrete and already visible. San Diego is now the fourth most expensive municipal water market in the country.^[8] The San Diego County Water Authority originally projected desalination would add about $5.14 a month to the average household bill when 2016 rates were set; costs have run well past that since, with an 8.3% wholesale rate increase in 2026 alone pushing the average combined water/sewer bill up $22 a month, and further increases of 14.5%, 11.5%, and 11% already scheduled through 2029 — a roughly 60% cumulative rise.^[9] Desalination is not the sole driver of that increase, but it is consistently the most expensive line item in the supply portfolio, and the contractual structure compounds the problem: the Water Authority is locked into a take-or-pay agreement with Carlsbad's owner obligating it to purchase a fixed volume of water every year through 2045 regardless of actual need. A 2025 investigation found ratepayers had been billed $35 million for water the plant never even produced.^[10]

Energy is a meaningful share of that cost. Modern reverse-osmosis plants run roughly 3,500 kilowatt-hours per acre-foot at the treatment stage; Poseidon's own regulatory filing for Carlsbad cited nearly 4,900 kilowatt-hours per acre-foot once delivery is included.^[11] At a representative $0.30 per kilowatt-hour, that electricity alone costs on the order of $1,050 per acre-foot — meaning energy price volatility flows almost directly into water price volatility in a way it does not for recycled or imported supply. Statewide, the aggregate load is small — a million acre-feet of desalinated water would draw roughly 3,500 gigawatt-hours, about one percent of California's total annual electricity consumption — but locally, a single large plant is a substantial, continuous new load; Carlsbad alone is reported to use enough power for some 35 small towns.^[12] Whether that local load is met by renewable generation or by the marginal, often gas-fired generation that fills in around intermittent renewables is not well documented for California's existing plants — a genuine gap in the public record, not a settled fact in either direction.

III. What It Produces, Against What's Needed

California manages roughly 40 million acre-feet of water a year, split roughly 40% agricultural, 50% environmental, and 10% urban use, with agriculture alone consuming about 34 million acre-feet across 9.6 million irrigated acres in an average year.^[13] The state projects climate change could cut total supply by 6 to 9 million acre-feet by 2040, and has set a matching target to close that gap through four levers: 4 million acre-feet of new wet-year storage, recycling targets rising to 1.8 million acre-feet a year by 2040, 500,000 acre-feet a year freed through conservation, and new supply from desalination and stormwater capture.^[14]

Set against that target, desalination's actual contribution is small. Carlsbad produces about 56,000 acre-feet a year; Doheny will produce roughly 5,600. A dozen Carlsbad-scale plants statewide — a genuinely enormous, decades-long buildout — would supply under 700,000 acre-feet a year, less than a tenth of the projected gap.^[15] Brackish (non-coastal) desalination is actually the larger and faster-growing category in volume terms, with the state targeting 28,000 acre-feet a year of new brackish capacity by 2030 and 84,000 by 2040 — modest numbers next to the recycling and storage targets they sit beside.^[15:1] Desalination, in other words, is not positioned by the state's own numbers to be a primary lever for closing California's supply gap. Its case rests on a different property entirely: unlike every other lever in that strategy, its output does not depend on rain.

IV. Climate Change Cuts Both Ways

That drought-independence is becoming more valuable and more contested at the same time. Sierra snowpack — currently providing up to a third of the state's water by storing winter precipitation for release through the dry season — is projected to fall to roughly two-thirds of historical levels by 2050, and what does fall is increasingly melting earlier and faster, arriving before it's needed rather than during the summer months when demand peaks.^[16] California already has the most variable year-to-year precipitation in the continental United States, and that variability is intensifying into what climate scientists call hydroclimate whiplash: longer droughts punctuated by fewer, more extreme wet events, as a warming atmosphere holds and releases roughly seven percent more water per degree Celsius of warming.^[17] Every other tool in the state's portfolio — recycling, conservation, recharge, storage — depends to some degree on that increasingly unreliable precipitation signal. Desalination, drawing from the ocean, does not.

But the same warming climate that strengthens desalination's rationale also threatens where it can physically operate. Sea-level rise drives saltwater intrusion into coastal aquifers independent of anything a desal plant does, and the basins most exposed — the Pajaro and Salinas Valleys, the Oxnard Plain, the urbanized coastal plains of Los Angeles and Orange Counties — are largely the same basins where desalination projects are sited or proposed.^[18] This is not a future hypothetical: sea-level rise flooding risk at the proposed site was one of the explicit reasons the Coastal Commission cited in killing Huntington Beach.^[19] The technology California is leaning on precisely because it doesn't depend on rain is sited in places increasingly vulnerable to a different consequence of the same warming climate.

V. The Counter-Case: Managed Aquifer Recharge

Set desalination's profile against its cheapest serious rival and the contrast sharpens rather than softens. Managed Aquifer Recharge — and specifically Flood-MAR, a named California Department of Water Resources program — redirects flood-stage winter runoff onto farmland, floodplains, and flood bypasses to infiltrate and replenish groundwater, largely using existing irrigation and flood-control infrastructure rather than new treatment plants.^[20] On cost alone it beats desalination by roughly a factor of three: about $1,200 an acre-foot on a capital basis, against desalination's $2,700–$4,000-plus.^[21]

The more important contrast is structural, not just financial. Every desalination mitigation measure catalogued in this series — wetland restoration to offset fish loss, multiport diffusers to dilute brine, subsurface intake to avoid entrainment in the first place — exists to cancel out a harm the technology itself creates. Flood-MAR's benefits run the other direction. Diverting artificially elevated peak flows back toward their natural seasonal range reduces streambank erosion and channel scouring as a direct effect, not a purchased offset. Recharging groundwater during wet periods sustains higher dry-season baseflow, which keeps streams cooler and preserves over-summering habitat for juvenile salmon and other native fish — California's Department of Water Resources specifically cites Chinook salmon as a beneficiary.^[22] Desalination needs mitigation to avoid making things worse. Flood-MAR makes a downstream ecosystem measurably better as a byproduct of doing its job. And because groundwater already supplies 40 to 60 percent of California's water depending on the year, MAR is replenishing the resource the state already depends on most, rather than building an entirely parallel one.^[23]

But MAR's advantage is conditional in a way desalination's is not, and the condition is precipitation. During California's 2012–2016 drought, Central Valley groundwater storage lost an estimated 28 cubic kilometers — roughly 22.7 million acre-feet — and less than a third of that has ever been recovered.^[24] The reason is structural, not a failure of effort: in any given wet year, the excess streamflow actually available to divert into recharge basins statewide is capped at roughly 1.2 million acre-feet, and even in the wet years immediately following the 2012–2016 drought, median aquifer recovery reached only about 19 percent of the overdraft.^[25] MAR cannot manufacture water that isn't falling. It is, by design, a wet-year tool — exactly the tool that does the least good in the exact years, the multi-year droughts, when reliable supply matters most. That is the one gap in California's portfolio that only a precipitation-independent source can fill, and it is the only part of desalination's case that survives the cost comparison in this article on its own terms.

Conclusion

Desalination in California is expensive, energy-intensive, ecologically costly in ways that require active mitigation rather than generating it, and structurally a small contributor to the volume the state actually needs. Its cheapest serious rival, managed aquifer recharge, beats it on cost and produces ecological benefits rather than harms requiring offset — but only in years wet enough to recharge from, which is precisely when California needs supply the least. Desalination's whole case rests on covering the years MAR cannot reach. That is a real and narrow justification, not the broad one often made for it, and the gap between the two is becoming both more valuable and, because of where these plants have to sit, more precarious as the climate changes. The next article turns to who is actually deciding how much of each tool California builds, and on whose behalf.

Footnotes

Sources

Government & Regulatory

California State Water Resources Control Board — Ocean Plan Desalination Provisions, Carlsbad regulatory record — waterboards.ca.gov

California Department of Water Resources — Water Supply Strategy, Desalination Resource Management Strategy, statewide allocation reports — water.ca.gov

U.S. Geological Survey — coastal groundwater hazards, sea-level rise — usgs.gov

Research & Policy Analysis

Pacific Institute — The Cost of Alternative Water Supply and Efficiency Options in California — pacinst.org

Public Policy Institute of California — Water Use in California; Climate Change and California's Water — ppic.org

UC Davis Environs — When Desal in California Gets the Green Light: A Comparison of Four Projects — environs.law.ucdavis.edu

California Policy Center — Rebuilding California's Infrastructure (Desalination) — californiapolicycenter.org

Journalism

CalMatters — A salty dispute; How can California boost its water supply? — calmatters.org

LAist — Plan For Huntington Beach Desalination Plant Is Rejected — laist.com

Voice of San Diego — San Diegans Owe a Desal Company $35 million for Unmade Water — voiceofsandiego.org

San Diego Coastkeeper — Why Is Your Water Bill So High?; Potable Reuse vs. Desalination — sdcoastkeeper.org

Coyote Gulch — San Diego: America's 4th most expensive municipal water — coyotegulch.blog

UCLA Newsroom — snowpack and hydroclimate whiplash reporting — newsroom.ucla.edu

NRDC — California's Climate Whiplash — nrdc.org

Managed Aquifer Recharge / Flood-MAR

California Department of Water Resources — Flood-Managed Aquifer Recharge program; Going with the Flow: How Aquifer Recharge Reduces Flood Risk — water.ca.gov

California Flood-MAR Hub — floodmar.org

California WaterBlog — A Functional Flows approach to implementing Flood-MAR — californiawaterblog.com

Science for Conservation — Benefits and Economic Costs of Managed Aquifer Recharge in California — scienceforconservation.org

Alam et al. — Can Managed Aquifer Recharge Mitigate the Groundwater Overdraft in California's Central Valley?; Post-Drought Groundwater Storage Recovery in California's Central Valley — Water Resources Research, agupubs.onlinelibrary.wiley.com

Stanford Doerr School of Sustainability — Groundwater in California's Central Valley may be unable to recover from past and future droughts — sustainability.stanford.edu

South Coast Water District, "Doheny Ocean Desalination Project." scwd.org/about/district_projects/doheny_ocean_desalination_project/index.php; LAist, "Plan For Huntington Beach Desalination Plant Is Rejected" (May 2022). laist.com/news/climate-environment/final-approval-of-poseidon-desalination-plant-in-huntington-beach-hangs-in-the-balance ↩︎
California State Water Resources Control Board, "Ocean Plan Requirements for Seawater Desalination Facilities," Desalination Provisions adopted May 2015. waterboards.ca.gov/water_issues/programs/ocean/desalination/ ↩︎
CalMatters, "A salty dispute: California Coastal Commission unanimously rejects desalination plant" (May 2022). calmatters.org/environment/2022/05/california-desalination-plant-coastal-commission/ ↩︎
Wikipedia, "Claude 'Bud' Lewis Carlsbad Desalination Plant." en.wikipedia.org/wiki/Claude_"Bud"_Lewis_Carlsbad_Desalination_Plant; San Diego Regional Water Quality Control Board, "Carlsbad Desalination Plant." waterboards.ca.gov/sandiego/water_issues/programs/regulatory/carlsbad_desalination.html ↩︎
The Lyncean Group of San Diego, "Status of Desalination Plants in California." lynceans.org/all-posts/status-of-desalination-plants-in-california-2/; South Coast Water District, Doheny project cost projections, cited via UC Davis Environs comparison report. environs.law.ucdavis.edu/sites/g/files/dgvnsk15356/files/2025-05/Huang - Macroed.pdf ↩︎
Pacific Institute, "The Cost of Alternative Water Supply and Efficiency Options in California" (2016). pacinst.org/wp-content/uploads/2016/10/PI_TheCostofAlternativeWaterSupplyEfficiencyOptionsinCA.pdf; San Diego Coastkeeper, "Potable Reuse vs. Desalination." sdcoastkeeper.org/blog/potable-reuse-vs-desalination/; California Department of Water Resources, "Desalination (Brackish and Seawater) Resource Management Strategy," Draft, California Water Plan Update 2023. water.ca.gov/-/media/DWR-Website/Web-Pages/Programs/California-Water-Plan/Docs/Update2023/PRD/RMS/Draft-Desalination-RMS.pdf ↩︎
CalMatters, "How can California boost its water supply?" calmatters.org/explainers/california-water-solutions/ ↩︎
Coyote Gulch, "San Diego: America's 4th most expensive municipal water" (April 2026). coyotegulch.blog/2026/04/14/san-diego-americas-4th-most-expensive-municipal-water/ ↩︎
San Diego Coastkeeper, "Why Is Your Water Bill So High? The Story Behind San Diego's Rising Rates." sdcoastkeeper.org/blog/why-is-san-diego-water-bill-so-high/; sd-cash-buyer.com, "San Diego Water Rates Surge 14.7% and Sewer 6% in 2026." ↩︎
Voice of San Diego, "San Diegans Owe a Desal Company $35 million for Unmade Water" (September 2025). voiceofsandiego.org/2025/09/22/san-diegans-owe-a-desal-company-35-million-for-unmade-water/ ↩︎
California Policy Center, "Rebuilding California's Infrastructure (Desalination)." californiapolicycenter.org/rebuilding-californias-infrastructure-desalination-part-4-of-6/ ↩︎
Maven's Notebook, "EDWARD RING: Desalination at Scale is Cost Competitive" (March 2025). mavensnotebook.com/2025/03/13/edward-ring-desalination-at-scale-is-cost-competitive/ ↩︎
Wikipedia, "Water in California," citing California Department of Water Resources data. en.wikipedia.org/wiki/Water_in_California; Public Policy Institute of California, "Water Use in California." ppic.org/publication/water-use-in-california/ ↩︎
California Department of Water Resources, "Governor Newsom launches most ambitious water plan in California history" (February 2026). water.ca.gov/News/News-Releases/2026/Feb-2026/Governor-Newsom-launches-most-ambitious-water-plan-in-California-history ↩︎
California Department of Water Resources, "State Report Identifies Future Desalination Plants to Meet Statewide Water Reliability Goals" (February 2024). water.ca.gov/News/Blog/2024/Feb-24/State-Report-Identifies-Future-Desalination-Plants-to-Meet-Statewide-Water-Reliability-Goals; The Lyncean Group of San Diego, supra note 5. ↩︎ ↩︎
UCLA Newsroom, "Climate change puts California's snowpack in jeopardy in future droughts." newsroom.ucla.edu/releases/climate-change-puts-california-s-snowpack-under-the-weather; Public Policy Institute of California, "Climate Change and California's Water." ppic.org/publication/climate-change-and-californias-water/ ↩︎
UCLA Newsroom, "Floods, droughts, then fires: Hydroclimate whiplash is speeding up globally." newsroom.ucla.edu/releases/floods-droughts-fires-hydroclimate-whiplash-speeding-up-globally; NRDC, "California's Climate Whiplash." nrdc.org/stories/californias-climate-whiplash ↩︎
U.S. Geological Survey, "Increasing threat of coastal groundwater hazards from sea-level rise in California." pubs.usgs.gov/publication/70212542 ↩︎
CalMatters, supra note 3. ↩︎
California Department of Water Resources, "Flood-Managed Aquifer Recharge (Flood-MAR)." water.ca.gov/programs/all-programs/flood-mar; California Flood-MAR Hub. floodmar.org ↩︎
Science for Conservation, "Benefits and Economic Costs of Managed Aquifer Recharge in California." scienceforconservation.org/products/benefits-and-economic-costs-of-managed-aquifer-recharge; cost comparison per note 6, supra. ↩︎
California Department of Water Resources, "Going with the Flow: How Aquifer Recharge Reduces Flood Risk" (August 2022). water.ca.gov/News/Blog/2022/Aug-22/How-Aquifer-Recharge-Reduces-Flood-Risk; California WaterBlog, "A Functional Flows approach to implementing Flood-MAR" (January 2024). californiawaterblog.com/2024/01/08/a-functional-flows-approach-to-implementing-flood-mar/ ↩︎
California WaterBlog, supra note 22. ↩︎
Alam et al., "Can Managed Aquifer Recharge Mitigate the Groundwater Overdraft in California's Central Valley?" Water Resources Research (2020). agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020wr027244; Stanford Doerr School of Sustainability, "Groundwater in California's Central Valley may be unable to recover from past and future droughts." sustainability.stanford.edu/news/groundwater-californias-central-valley-may-be-unable-recover-past-and-future-droughts ↩︎
Alam et al., "Post-Drought Groundwater Storage Recovery in California's Central Valley," Water Resources Research (2021). agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021WR030352 ↩︎

A Looming Water Crisis: The Prisoner's Dilemma

Thu, 25 Jun 2026 00:00:00 GMT

A Looming Water Crisis:

The Prisoner's Dilemma

A Policy & Legal Analysis—June 2026

Introduction

The United States is confronting a water crisis of historic proportions—and the legal, political, and institutional architecture designed to address such crises is failing on multiple fronts. This is not merely a story about drought, overuse, or climate change. It is a story about structural democratic failure: how gerrymandered legislatures, a narrowing Supreme Court, dismantled regulatory authority, and the cold logic of game theory combine to leave one of humanity's most essential resources without an adequate guardian.

American water law is a fractured inheritance. Eastern states operate under riparian rights—rooted in English common law—in which landowners adjacent to water share reasonable use of the water as a community resource. Western states operate under prior appropriation: "first in time, first in right," a doctrine born in the gold rush that treats water as a property right governed by the command "use it or lose it." These two systems, designed for different geographies and different eras, collide uneasily with the demands of a 21st-century economy under climatic stress.

Into this already strained system has come a new and voracious consumer: the data center. U.S. data centers directly consumed 17.4 billion gallons of water in 2023—equivalent to the daily needs of roughly 160,000 American households—and that figure is projected to reach between 38 and 73 billion gallons by 2028^[1]. Driven by the explosive growth of artificial intelligence, these facilities are being built at speed and scale, overwhelmingly in water-stressed regions.

"Every thread of this crisis leads back to the same structural knot: a democracy whose inputs have been corrupted cannot produce the outputs a crisis demands."

I. The Regulatory Vacuum

Federal authority over water rests on the Commerce Clause and on landmark statutes: the Clean Water Act, the Safe Drinking Water Act, and a web of agency rules built atop these foundations. That architecture is now being systematically dismantled by the Supreme Court at precisely the moment the crisis demands it most.

In West Virginia v. EPA (2022), the Court's 6-3 majority explicitly adopted the "Major Questions Doctrine," holding that agencies cannot claim authority over matters of "vast economic and political significance" without clear and explicit congressional authorization^[2]. The ruling neutered the EPA's ability to impose broad greenhouse gas regulations—and its logic extends to virtually every major environmental regulatory action.

One year later, in Sackett v. EPA (2023), the Court applied similar textualist logic to the Clean Water Act, ruling that federal jurisdiction over wetlands requires a continuous surface connection to navigable waters^[3]. The ruling removed federal protection from roughly half of American wetlands overnight. In Loper Bright Enterprises v. Raimondo (2024), the Court overruled the forty-year-old Chevron doctrine entirely, stripping agencies of deference on their own statutory interpretations^[4].

The cumulative effect is a three-way institutional failure. Courts say gerrymandering is a political question—go to Congress. Congress is gridlocked. Agencies attempt to fill gaps through regulation—courts say not without explicit congressional authorization. The escape valves are being closed one by one.

II. The Gerrymandering Connection

The word "gerrymandering" does not appear in the Constitution. No amendment authorizes it. No federal statute created it. It exists in a legal vacuum —neither authorized nor prohibited by any enforceable federal mechanism. The Supreme Court codified that vacuum in Rucho v. Common Cause (2019), when Chief Justice Roberts held for a 5-4 majority that partisan gerrymandering claims present "political questions beyond the reach of the federal courts"^[5].

The consequence is a nearly closed loop of unaccountability. Legislators draw maps to protect their own power. Those maps produce legislatures that serve donor bases rather than median voters. Those legislatures cannot pass reform. Courts will not intervene. And the laws that emerge from this corrupted democratic process—on water, on the environment, on anything—reflect concentrated interests, not the public good.

The connection to water is direct. Western congressional delegations from safely gerrymandered districts serve powerful agricultural water users who are among their largest donors. Legislators have no electoral incentive to cut allocations that donors depend on. Reform proposals die in committee. Consider the Colorado River Compact of 1922—a governing agreement negotiated during an unusually wet period, before climate science, before modern hydrology, before the Sun Belt. It allocates more water than the river actually produces in most years. Seven states and Mexico depend on it. And the Law of the River—the constellation of compacts, decrees, and statutes built upon it—is being applied to a 21st-century crisis it was never designed to address.

"The Colorado River Compact allocates more water than the river produces. The legal system's answer has been to remove the tools that might fix it."

III. The Prisoner's Dilemma

Game theory offers the clearest lens for understanding why state-by-state water reform—the only politically viable route after Rucho closed the federal courthouse door—is so difficult to achieve.

In the classic Prisoner's Dilemma, two rational actors both defect even though mutual cooperation would produce the best collective outcome. If one cooperates and the other defects, the cooperator suffers the worst possible outcome. Rational self-interest drives both to defect.

Applied to water: if all states agreed to fair allocation standards and independent regulatory frameworks, all would benefit from sustainable long-term water security. But if one state imposes strict water regulations while neighboring states do not, industry—including data centers—migrates to the least-regulated jurisdiction. The reforming state loses economic activity without gaining regional water security.

This is not hypothetical. Arizona has made new groundwater certificates nearly impossible for hyperscale data center projects. Virginia has imposed mandatory reclaimed water use clauses. But Texas has imposed no such constraints, and a University of Houston study projects that Texas data centers will consume 49 billion gallons of water in 2025, rising to as much as 399 billion gallons by 2030—equivalent to draining Lake Mead by more than 16 feet annually^[6].

The prisoner's dilemma has known solutions: a binding simultaneous agreement, repeated-game punishment mechanisms, a third-party enforcer, or changed payoff structures. Every solution runs into the same wall. A binding federal agreement requires a functional Congress. Repeated-game punishment operates on 10-year redistricting cycles—too slow to deter. The federal court enforcer withdrew in Rucho and Sackett. And changing payoffs requires political will that safe districts insulate legislators from having to generate.

IV. The Data Center Accelerant

Data centers have transformed from a background infrastructure concern into an acute water crisis accelerant. A single large hyperscale facility can consume between one and five million gallons of water per day—equivalent to the daily needs of a city of 50,000 people^[7]. AI workloads have increased cooling demand three to six times since 2022. Two-thirds of new hyperscale campuses built since 2022 are located in high or extreme water-stress counties^[8].

The pollution dimension compounds the consumption problem. Cooling water returned to water systems carries higher concentrations of dissolved solids—calcium, chloride, silica—that affect drinking water quality, depress crop yields, and are toxic to aquatic ecosystems. Improperly maintained cooling towers can harbor Legionella bacteria. Fewer than one-third of data center operators track water consumption, and some local government officials have signed non-disclosure agreements with developers, shielding this information from the public^[9].

Technical solutions exist and are advancing. Microsoft's closed-loop cooling systems, adopted beginning in 2024, can save more than 33 million gallons of coolant per facility per year by circulating it without evaporative loss. Water reuse systems drawing on treated wastewater and greywater can reduce freshwater consumption by up to 80%^[10]. But technology without mandate is voluntary. And voluntary in a prisoner's dilemma means that whoever imposes costs on themselves first loses ground to those who do not.

V. What Reform Requires

A genuine remedy to the water crisis requires simultaneous action on three planes: democratic, legal, and technical. The interconnection is not incidental—it is structural.

On the democratic plane, gerrymandering reform is the load-bearing prerequisite. A federal mandate for independent redistricting commissions—authorized by the Elections Clause of Article I, Section 4—would not require creating a new constitutional right. It would merely fill a prohibition gap that Rucho explicitly said Congress could fill. Conditional preemption—the mechanism by which federal law sets a floor while states choose how to comply or face federal fallback commissions—is constitutionally established and well-tested in environmental law.

On the legal plane, a comprehensive federal water framework law must be drafted with sufficient specificity to withstand Major Questions scrutiny. The lesson of West Virginia v. EPA is not that the EPA cannot regulate—it is that Congress must say so clearly. A statute explicitly authorizing federal minimum water standards for data centers, establishing interstate water compacts with enforcement mechanisms, and restoring wetland protections stripped by Sackett would be legally durable if drafted with sufficient precision.

On the technical plane, mandatory Water Usage Effectiveness standards, phased timelines for transitioning to closed-loop cooling, water offset requirements for facilities in stressed watersheds, and mandatory public disclosure of consumption data would transform voluntary best practices into enforceable minimums. None requires constitutional amendments. All require a Congress capable of legislating.

"The tools to fix this crisis exist—constitutionally, statutorily, and technologically. What is missing is the democratic infrastructure to deploy them."

Conclusion

The water crisis and the democracy crisis are not separate problems. They are the same problem. Gerrymandering produces legislators who serve concentrated interests over the public good. A Court narrowing agency authority closes the regulatory escape valves. Game theory ensures states cannot cooperate unilaterally to fill the void. And into that void, data centers—the physical infrastructure of the AI economy—pour billions of gallons of irreplaceable water each year.

Common law and purposivist judicial interpretation can right individual wrongs and remedy discrete harms. But systemic crises of this magnitude—a depleting Colorado River, a groundwater table in free fall, an AI economy with the water footprint of a mid-sized nation—require legislative action at scale. That action requires a functional Congress. A functional Congress requires fair elections. Fair elections require ending gerrymandering.

The prisoner's dilemma has one reliable solution: a trusted enforcer who binds all players simultaneously, preventing any unilateral defection. In the American constitutional system, that enforcer is Congress. When Congress cannot act, the dilemma has no solution within the existing architecture. That is where the United States finds itself today—with the water running out and the instruments of remedy locked inside the very problem they are meant to solve.

Footnotes

Sources

Case Law (via official court records and SCOTUSblog)

Rucho v. Common Cause, 588 U.S. 684 (2019)—supremecourt.gov | brennancenter.org | scotusblog.com

West Virginia v. EPA, 597 U.S. 697 (2022)—supremecourt.gov | en.wikipedia.org/wiki/West_Virginia_v._EPA

Sackett v. EPA, 598 U.S. 651 (2023)—supreme.justia.com/cases/federal/us/598/21-454/

Loper Bright Enterprises v. Raimondo, 603 U.S. ___ (2024)—overruling Chevron U.S.A. v. NRDC, 467 U.S. 837 (1984)

Marbury v. Madison, 5 U.S. 137 (1803)—foundational judicial review precedent

Printz v. United States, 521 U.S. 898 (1997)—anti-commandeering doctrine

Smiley v. Holm, 285 U.S. 355 (1932)—Congress authority to override state election rules

Government Reports & Data

Shehabi, A. et al. (2024). 2024 United States Data Center Energy Usage Report. Lawrence Berkeley National Laboratory. LBNL-200163. doi.org/10.71468/P1WC7Q

U.S. Congressional Research Service (2026). Data Centers and Their Energy Consumption: Frequently Asked Questions. R48646. congress.gov/crs-product/R48646

U.S. EPA (2025). Data center water consumption statistics cited in MOST Policy Initiative (April 2026).

Academic Sources

Bondurant, E.J. (2021). "Rucho v. Common Cause—A Critique." Emory Law Journal 70(5). scholarlycommons.law.emory.edu/elj/vol70/iss5/1/

Joyce, S.B. (2024). "Testing the Major Questions Doctrine." Stanford Environmental Law Journal 43:50. law.stanford.edu/publications/testing-the-major-questions-doctrine/

Privette, C. et al. (2026). "Data Centers Water Footprint: The Need for More Transparency." AGU Advances. agupubs.onlinelibrary.wiley.com/doi/10.1029/2025AV002140

Harvard Law Review (2019). "Political Question Doctrine—Rucho v. Common Cause." harvardlawreview.org/wp-content/uploads/2019/11/252-261_Online.pdf

Georgetown Environmental Law Review (2023). "Loaded Docket: Sweeping Constitutional Challenges Facing Regulatory Authority." law.georgetown.edu/environmental-law-review/blog/loaded-docket

American Bar Association (2023). "The Major Questions Doctrine Post-West Virginia v. EPA." americanbar.org/groups/environment_energy_resources/resources/trends/2023-january-february/

**Industry & Policy Reports **

MOST Policy Initiative. "Data Center Water Use." April 8, 2026. mostpolicyinitiative.org/science-note/data-center-water-use/

Lincoln Institute of Land Policy. "Data Drain: The Land and Water Impacts of the AI Boom." February 23, 2026. lincolninst.edu/publications/land-lines-magazine/articles/land-water-impacts-data-centers/

Nature Forward. "Data Centers and Water Use." March 20, 2026. natureforward.org/data-centers-and-water-use/

Control Associates. "Water Use and Regulation in Data Centers." November 22, 2025. controlassociatesinc.com/blog/data-center-water-regulation-2026

AIRSYS North America. "Water Free Cooling Systems for Data Centers." February 2026. abccarolinas.org/how-water-free-cooling-systems-are-transforming-sustainable-construction-and-data-center-design/

Common Cause. "Common Cause v. Rucho." January 23, 2026. commoncause.org/work/common-cause-v-rucho/

Kirkland & Ellis LLP. "The Major Questions Doctrine Reigns Supreme in West Virginia v. EPA." July 6, 2022. kirkland.com/publications/kirkland-alert/2022/07/supreme-court-west-virginia-v-epa

MOST Policy Initiative, "Data Center Water Use" (April 8, 2026), citing U.S. EPA (2025) and Shehabi et al., 2024 United States Data Center Energy Usage Report, Lawrence Berkeley National Laboratory (LBNL-200163). mostpolicyinitiative.org/science-note/data-center-water-use/ ↩︎
West Virginia v. Environmental Protection Agency, 597 U.S. 697 (2022). 6-3 decision holding that the EPA lacked clear congressional authorization to impose generation-shifting carbon regulations under §111(d) of the Clean Air Act. The Court explicitly adopted the Major Questions Doctrine. ↩︎
Sackett v. Environmental Protection Agency, 598 U.S. 651 (2023). The Court held that Clean Water Act jurisdiction over wetlands requires a continuous surface connection to navigable waters, significantly narrowing federal wetland protections. supreme.justia.com/cases/federal/us/598/21-454/ ↩︎
Loper Bright Enterprises v. Raimondo, 603 U.S. ___ (2024). The Court overruled Chevron U.S.A. v. Natural Resources Defense Council, 467 U.S. 837 (1984), eliminating forty years of judicial deference to agency statutory interpretations. ↩︎
Rucho v. Common Cause, 588 U.S. 684 (2019). Chief Justice Roberts, writing for a 5-4 majority, held that partisan gerrymandering claims "present political questions beyond the reach of the federal courts" because federal judges have "no license to reallocate political power between the two major political parties." supremecourt.gov/opinions/18pdf/18-422_9ol1.pdf ↩︎
Lincoln Institute of Land Policy, "Data Drain: The Land and Water Impacts of the AI Boom" (February 23, 2026), citing Houston Advanced Research Center (HARC) and University of Houston projections. lincolninst.edu/publications/land-lines-magazine/articles/land-water-impacts-data-centers/ ↩︎
Nature Forward, "Data Centers and Water Use" (March 20, 2026). Enterprise hyperscale data centers consume one to five million gallons per day. natureforward.org/data-centers-and-water-use/ ↩︎
Control Associates, "Water Use and Regulation in Data Centers: Preparing for the 2026 Standard" (November 22, 2025), citing Bloomberg (May 2025) siting data. controlassociatesinc.com/blog/data-center-water-regulation-2026 ↩︎
Nature Forward, supra note 7. Fewer than one-third of data center operators track water consumption; some local officials have signed NDAs with developers. ↩︎
AIRSYS North America, "Maximizing Efficiency with Water Free Cooling Systems for Data Centers" (February 2026). abccarolinas.org/how-water-free-cooling-systems-are-transforming-sustainable-construction-and-data-center-design/ ↩︎