Napa-Sonoma Valley – Lowlands
Statistics
- Basin Name
- Napa-Sonoma Valley – Lowlands
- Basin Number
- 2-002.03
- SGMA Basin Priority
- Medium
- Critically Overdrafted
- No
- Hydrologic Region Name
- San Francisco Bay
- Counties
- Napa
At-A-Glance
Located in California’s San Francisco Bay hydrologic region, the Napa-Sonoma Valley – Lowlands is 40,297.45 acres in size. This Medium 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.
Basin Notes
1980: Ground Water Basins in California: A Report to the Legislature in Response to Water Code 12924, Bulletin 118-80
2003: Bulletin 118 basin description
2017: Napa County Comprehensive Groundwater Monitoring Program 2016 Annual Report and GASGEM Update
2017: Napa County Comprehensive Groundwater Monitoring Program 2016 Annual Report and GASGEM Update
2018: basin priority changed from very low to a draft medium, requiring SGMA compliance. Basin boundary modification requested with Napa-Sonoma Valley – Sonoma Valley
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
As with the adjoining Napa-Sonoma Valley – Napa Valley Subbasin 2-002.01, and other valleys within Napa County, an alternative plan to a GSP and basin analysis have been submitted to the DWR along with a basin analysis
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.