Napa-Sonoma Valley – Lowlands

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Napa-Sonoma Valley – Lowlands

Statistics

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.

Source: CA DWR

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.

GSA Information

Models