Source: sjvwater.org

MEETING NOTES: Kern water districts weigh mussel treatment costs

Fetched 2026-07-21 08:01 from sjvwater.org

Reading Summary (AI-generated)

Reading Summary: Kern Water Districts & Golden Mussel Treatment Costs

Key Facts

• Shafter-Wasco Irrigation District voted to pursue aggressive treatment of invasive golden mussels at a cost of $509,491, rejecting a cheaper pause-and-restart option at $127,373
• A June copper-chemical treatment by GreenLeaf Ag cost $139,200 and produced a visible mass kill of mussels by July 4
• Arvin-Edison Water Storage District tabled a $1.3 million second-phase treatment contract with SePRO Corporation, which had already performed a first treatment in April for $2.5 million
• Arvin-Edison’s sticking point: SePRO’s proposed $10 million liability cap was deemed insufficient given potential crop losses in the hundreds of millions
• Arvin-Edison will hold a special board meeting August 11 to decide on next steps after investigating competing vendors

Who Is Affected

• Shafter-Wasco Irrigation District ratepayers (though no rate increases are planned; reserves will cover costs)
• Arvin-Edison Water Storage District and its agricultural customers facing potential infrastructure damage
• Growers relying on both districts’ delivery systems, who risk plugged irrigation lines if mussels go untreated

Policy/Legal Angle

• No specific laws or court decisions are cited, but the liability cap dispute raises significant contractor liability and risk allocation questions under procurement and water service agreements
• The insurance cap debate implicitly touches on who bears financial responsibility if copper-based chemical treatments damage crops — a potential regulatory and tort liability issue

Blog Angles

1. The liability gap problem: Who is actually on the hook if chemical treatments harm crops? The $10M cap vs. hundreds-of-millions in potential losses suggests a broader unresolved question about vendor insurance standards across California water districts fighting golden mussels.
2. Aggressive vs. cautious treatment strategies: Shafter-Wasco and Arvin-Edison are taking notably different approaches — what does the science say about which strategy produces better long-term mussel control at lower cost?
3. Cost escalation watch: Arvin-Edison has already spent $2.5M on one treatment and is weighing $1.3M more. How are small and mid-size districts across the San Joaquin Valley budgeting for what could become a recurring, open-ended expense?

Full Text

MEETING NOTES: Kern water districts weigh mussel treatment costs

Meetings and agenda packets: Shafter-Wasco Irrigation District July 8 agenda CLICK HERE Arvin-Edison Water Storage District July 14 agenda CLICK HERE

Shafter-Wasco opts for strong offense

The Shafter-Wasco Irrigation District board voted at its July 8 meeting to spend more to hit invasive golden mussels hard in October, rather than saving costs by reducing treatments.

General Manager Kris Lawrence had recommended pausing treatments after low-doses of a copper chemical applied by GreenLeaf Ag proved successful in June.

Lawrence showed a video from a grower taken July 4 of a large mass of dead detached mussels. That treatment cost $139,200.

Lawrence recommended stopping treatment over summer, then restarting it in October at an expected cost of $127,373.

He said that consulting firm Dudek had explained that contributing factors such as lower calcium levels in the water and additional product placed in the system by growers would make it difficult for the veligers, mussel offspring, to survive.

The other option was to continue the low-dose treatments through summer, culminating in a larger kill treatment in October. Cost for this option is $509,491.

The board sided with the second, more aggressive option.

“I’d rather have a grower come to me and complain about spending five hundred thousand than come to me and say his lines are plugged up,” board member, David Bloemhof III, stated.

The board approved continuing treatment and will assess the situation month by month. Additionally district staff will order veliger monitoring kits to help with month-by-month assessment.

Funds for treatment costs are expected to come from district reserves and would not lead to rate increases at this time.

Arvin-Edison board hits pause over insurance caps

At it’s July 14 meeting, the Arvin-Edison Water Storage District tabled a decision to spend $1.3 million on a second phase of mussel treatment while it explores other vendors that may offer a higher insurance liability cap.

SePRO Corporation, which did Arvin-Edison’s first treatment in April for $2.5 million, wants to set a liability cap of $10 million.

Board members balked at that saying if water treatments proved detrimental, crop losses could be in the hundreds of millions.

Director Catalino Martinez asked if others vendors might offer different levels of insurance caps prompting directors to ask what other districts had found on this issue.

The board opted to have staff investigate the current status of golden mussel growth in the district as well as SePRO competitors.

The district will hold a special board meeting on August 11 to make a decision on the next phase of treatment.