San Joaquin Valley – Turlock

San Joaquin Valley – Turlock


  • Basin Name
  • San Joaquin Valley – Turlock
  • Basin Number
  • 5-022.03
  • SGMA Basin Priority
  • High
  • Critically Overdrafted
  • No
  • Status
  • Subject to SGMA
  • DWR Region & POC
  • South Central Region Office
    Chris Montoya
    (559) 230-3347

  • Number of Wells
  • 6916
  • Hydrologic Region Name
  • San Joaquin River
  • Counties
  • Merced, Stanislaus


Located in California’s San Joaquin River hydrologic region, the San Joaquin Valley – Turlock is 348,187 acres in size. This High priority basin is home to an estimated 202,206 people (2010 value), which have been at a rate of 37.89. San Joaquin Valley – Turlock is a(n) basin with approximately 6916 wells, of which approximately 175 are water supply wells. Groundwater accounts for approximately 49.87 percent of the basin’s water supply.

Basin Notes

2003: Bulletin 118 basin description

2008: Turlock Groundwater Basin Draft Groundwater Management Plan

2014: CASGEM prioritization – high

2018: Draft basin prioritization – high. Comment:  CASGEM/WDL/GWIDS: Longterm hydrographs show groundwater level decline. Source: DWR 2) Pumping depressions and groundwater level decline stated in GWMP

2018 Final Basin Prioritization: Basin status remains unchanged at high priority.

GSA Information

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