Gilroy-Hollister Valley – Hollister Area
Statistics
- Basin Name
- Gilroy-Hollister Valley – Hollister Area
- Basin Number
- 3-003.03
- SGMA Basin Priority
- Medium
- Critically Overdrafted
- No
- Status
- Subject to SGMA
- DWR Region & POC
South Central Regional Office
Mike McKenzie
(559) 230-3308
Charles.McKenzie@water.ca.gov- Number of Wells
- 464
- Hydrologic Region Name
- Central Coast Hydrologic Region
- Counties
- San Benito, Santa Clara
At-A-Glance
Located in California’s Central Coast hydrologic region, the Gilroy-Hollister Valley – Hollister Area is 32,540 acres in size. This Medium priority basin is home to an estimated 22,005 people (2010 value), which have been at a rate of 0.07. Gilroy-Hollister Valley – Hollister Area is a(n) basin with approximately 464 wells, of which approximately 22 are water supply wells. Groundwater accounts for approximately 87.28 percent of the basin’s water supply.
Basin Notes
2003: Bulletin 118 basin description.
2016: Basin boundary modification approved with Llargas Area 3-003.01 subbasin.
2018: Draft Basin Prioritization note: GWLs continued to decline in areas of basin that rely on GW, specifically in the Bolsa, San Juan, Hollister West, Bolsa SE, and Tres Pinos subbasins. While some subbasins showed groundwater level increases, overall groundwater in storage decreased. Groundwater elevation declines and storage decreases during drought do not constitute overdraft; nevertheless, the continued reduced supplies of imported water in tandem with increased groundwater demands are a warning of potential overdraft. Source: San Benito County Water District Annual Report
GSA Information