Napa-Sonoma Valley – Napa Valley
Statistics
- Basin Name
- Napa-Sonoma Valley – Napa Valley
- Basin Number
- 2-002.01
- SGMA Basin Priority
- High
- Critically Overdrafted
- No
- Hydrologic Region Name
- San Francisco Bay
- Counties
- Napa
- Adjacent Basins
At-A-Glance
Located in California’s San Francisco Bay hydrologic region, the High Priority Napa-Sonoma Valley – Napa Valley subbasin is home to an estimated 91,281 people (2010 value). It has approximately 2,073 wells, of which approximately 110 are water supply wells. Groundwater accounts for approximately 47 percent of the basin’s water supply.
Basin Notes
2003: Bulletin 118 2003 basin description
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substantial declines in GW elevations and RWQCB report that 43 underground fuel tank leaks have occurred in the basin (unpublished B-118 data) (Ludhorff & Scalmanini Consulting Engineers, 1999).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: High.
2022: January 31 – GSP submitted to DWR
2023: January 26 – GSP approved by DWR