Napa-Sonoma Valley – Lowlands
- Basin Name
- Napa-Sonoma Valley – Lowlands
- Basin Number
- SGMA Basin Priority
- Very Low
- Critically Overdrafted
- Hydrologic Region Name
- San Francisco Bay
- Napa, Solano
Located in California’s San Francisco Bay hydrologic region, the Napa-Sonoma Valley – Lowlands is 40,297.45 acres in size. This Very Low priority basin is home to an estimated 58,367 people (2010 value), which have been at a rate of .
Napa-Sonoma Valley – Lowlands is a(n) basin with approximately 282 wells, of which approximately 16 are water supply wells. Groundwater accounts for approximately 32 percent of the basin’s water supply.
May 2018: Napa-Sonoma Valley – Lowlands subbasin 2-002.03 reclassified as medium priority and subjected to SGMA. Adjoining Napa-Sonoma Valley – Napa Valley subbasin 2-002.01 proposed for reclassification from medium to high – Napa Valley Register
Basin boundary modification requested with Napa-Sonoma Valley – Sonoma Valley.
2019: Basin boundary modification approved. Per DWR: It “revises and aligns the shared boundary between Sonoma Valley and Sonoma Lowlands to follow the shared Sonoma and Napa County line.” Phase 2 draft priority: very low.