Napa County GSA

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Allocation

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Allocation Documents

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December 11, 2025

Committee supports groundwater extraction fees beginning in fiscal year 2026-27, with costs shared between the county (min $500,000 annually) and water users receiving notification in 2026. Research comparing ET measurements found OpenET models perform well in the region, while local CIMIS stations have experienced maintenance issues. 4 Managed Aquifer Recharge scenarios were explored, ranging from extended vineyard fallow periods to dedicated recharge basins, like Pajaro Valley's success.

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September 23, 2025

The board prioritized water issues, reporting progress on voluntary conservation, certification programs, and recharge efforts under the Groundwater Sustainability Plan. Still, the basin faces a 3,000 acre-feet annual deficit, making continued action critical. Supervisors also advanced affordable housing policy, directing major impact fee increases for the first time since 2010–2014, with exemptions for smaller homes and higher fees for large homes and hotels. Transportation impact fees...

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September 11, 2025

The County is advancing multiple groundwater pumping reduction programs, including a pilot water tracking app and vineyard replanting incentives. A new recharge feasibility study is analyzing three scenarios for water storage and conservation, with results expected in November. Stream flow monitoring shows that 10% pumping reductions near waterways could significantly increase low flows and reduce stream depletion, while new stream gauges will improve monitoring capabilities.

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