Napa-Sonoma Valley – Napa Valley
- Basin Name
- Napa-Sonoma Valley – Napa Valley
- Basin Number
- SGMA Basin Priority
- Critically Overdrafted
- Submitted Alternative to GSP
- DWR Region & POC
Northern Central Region Office
- Number of Wells
- Hydrologic Region Name
- San Francisco Bay
- Adjacent Basins
Napa-Sonoma Valley - Lowlands 2-002.03, Napa-Sonoma Valley - Sonoma Valley 2-002.02,
Located in California’s San Francisco Bay hydrologic region, the Napa-Sonoma Valley – Napa Valley is 44,660 acres in size. This High priority basin is home to an estimated 31,275 people (2010 value), which have been at a rate of 10.14. Napa-Sonoma Valley – Napa Valley is a(n) basin with approximately 1321 wells, of which approximately 42 are water supply wells. Groundwater accounts for approximately 75.73 percent of the basin’s water supply.
As an alternative to a GSP, Napa County an analysis of basin conditions that it argues demonstrates that the basin has operated within its sustainable yield over a period of at least 10 years. Click here to view the details.
Napa County groundwater information: Napa County Watershed Information and Conservation Council: Groundwater page
2014 Basin Prioritization comments:
Two isolated areas in the Sonoma Valley indicate substantial declines in GW elevations and RWQCB report that 43 underground fuel tank leaks have occurred in the basin (unpublished B-118 data) (Ludhorff & Scalmanini Consulting Engineers, 1999).
2018 Final Basin Prioritization changed the priority from medium to high.