TO: Napa County Groundwater Sustainability Agency
FROM: Brian D. Bordona, Director of Planning, Building and Environmental Services
REPORT BY: Jamison Crosby, Natural Resources Conservation Manager
SUBJECT: Presentation on GSP Annual Report for Water Year 2025
RECOMMENDATION
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SET TIME - 1:30 PM
Receive a presentation on the implementation of the Groundwater Sustainability Plan including the Annual Report for Water Year 2025, increased monitoring and outreach activities. (No Fiscal Impact)
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BACKGROUND
Pursuant to California Code of Regulations ?356.2, an Annual Report is required to be submitted to the Department of Water Resources (DWR) each year by April 1. This is the fifth Napa Valley Subbasin Groundwater Sustainability Plan (GSP) Annual Report submitted to DWR since the adoption of the GSP. The report contains both a narrative description and data in various formats including DWR provided templates.
Annual Reports are submitted to DWR through the state's Sustainable Groundwater Management Act (SGMA) Portal and are available for public comment at
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The Annual Report reflects an ongoing commitment by Napa County and the Napa County Groundwater Sustainability Agency (NCGSA) to sustainably manage groundwater resources by implementing an adaptive management approach supported by best available information.
The goal of the GSP is to achieve the sustainability goal by ensuring that there are no Undesirable Results in the Napa Valley Subbasin by 2042. To accomplish the goal, the GSP includes 6 Sustainability Indicators, as follows:
1. Chronic groundwater level decline;
2. Reduction in groundwater storage;
3. Depletion of interconnected surface water;
4. Land subsidence;
5. Degraded water quality; and
6. Seawater intrusion.
These are critical factors used to measure the long-term health of groundwater in the Napa Valley Subbasin. For each Sustainability Indicator, the GSP has established a Minimum Threshold, which defines when ...
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