Stanislaus and Tuolumne Rivers Groundwater Basin Association GSA

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Allocation

No allocation at this time - The groundwater agency has not yet adopted groundwater pumping allocations; the draft program proposes overlying allocations of 0.45 af/ac for all non-urban lands and example totals by management area, but these remain draft until formal adoption expected in 2026. - The draft program includes response triggers that allow the GSA to activate management-area action plans and impose enforceable allocations beginning in 2027 if groundwater levels decline or pumping exceeds the example targets. Districted Areas (MID + OID) – Overlying allocation: 0.45 af/ac – Developed supply (district-controlled, not per-acre): MID 90,900 AF; OID 31,600 AF.
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Allocation Documents

Allocation Base Rules

Allocation Document

Other Document

Helpful Link

Helpful Video

November 18, 2025

The groundwater allocation program framework presented at the workshop was substantially revised from the July draft to recognize irrigation districts' developed water supply, resulting in significantly higher developed supply credits for MID and OID. Non-District East is shown in the example allocation as having a base allocation equal to about 35% of historical pumping, but temporary relief through OID's surplus redistribution in Phase 1 would raise that to about 47% of historical use .

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October 15, 2025

A draft well mitigation program was released for public comment, offering up to $40,000 in assistance for domestic wells that go dry due to groundwater management activities since January 2022. The program will be administered through a partnership with Self-Help Enterprises, focusing specifically on domestic and small water system wells rather than agricultural wells. With a $300,000 initial budget, the program targets the 126 wells potentially at risk when groundwater reaches minimum...

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September 10, 2025

The groundwater sustainability agency approved a $100,000 budget increase to complete critical well mitigation and management programs by the January 2026 deadline. Two key workshops are scheduled for October and November to review draft programs, with documents released at least two weeks prior for public input. The compressed timeline requires both programs to be drafted by January 2026 and implemented by January 2027, creating urgency for member agencies to secure necessary approvals.

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