Tres Pinos Valley

Source: CA DWR

Tres Pinos Valley



Located in California’s Fake Hydrologic Region hydrologic region, the Tres Pinos Valley is 3,386 acres in size. This Very Low priority basin is home to an estimated 5 people (2010 value), which have been increasing based on + population trend at a rate of 99.

Tres Pinos Valley is a(n) urban (0) basin with approximately 99 wells, of which approximately 99 are water supply wells. Groundwater accounts for approximately 100 percent of the basin’s water supply.

Source: CA DWR

Basin Notes

2004: Bulletin 118 basin description

2014: CASGEM basin prioritization – very low

2017San Benito County Water District Annual Groundwater Report

2018: Draft basin priority – very low. Comments –

  • 1) CASGEM/WDL/GWIDS: Longterm hydrographs show groundwater level decline. Source: DWR
  • 2) 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.

2019: Basin boundary modification: Consolidated into Gilroy-Hollister Valley, North San Benito subbasin 3-003.05


GSA Information