Santa Clara River Valley – Fillmore

Source: CA DWR

Santa Clara River Valley – Fillmore


  • Basin Name
  • Santa Clara River Valley – Fillmore
  • Basin Number
  • 4-004.05
  • SGMA Basin Priority
  • High
  • Critically Overdrafted
  • No
  • Status
  • Subject to SGMA
  • DWR Region & POC
  • Southern Region Office
    Eddie Pech
    (818) 549-2324

  • Number of Wells
  • 377
  • Hydrologic Region Name
  • South Coast Hydrologic Region
  • Counties
  • Ventura


Located in California’s South Coast hydrologic region, the Santa Clara River Valley – Fillmore is 21,712 acres in size. This High priority basin is home to an estimated 16,399 people (2010 value), which have been at a rate of 16.5. Santa Clara River Valley – Fillmore is a(n) basin with approximately 377 wells, of which approximately 13 are water supply wells. Groundwater accounts for approximately 91.65 percent of the basin’s water supply.

Source: CA DWR
Source: CA DWR

Basin Notes

2003: Bulletin 118 basin description

2014: CASGEM Basin Prioritization: medium

2018: Draft basin prioritization: high. Groundwater levels, salt intrusion and subsidence comments –

  • Groundwater level decline account in 2014 and 2015 Piru and Fillmore Basins Biennial Groundwater Conditions Report, United Water Conservation District
  • Salt intrusion: Water purveyors in the Piru, Fillmore, Santa Paula, Mound, and Oxnard subbasins include United Water Conservation District and Ventura County. United Water Conservation District operates surface water facilities to encourage groundwater protection through conjunctive use (UWCD 2012). Groundwater issues within the United Water Conservation District service area (which includes all of the basin) include overdraft conditions, sea water intrusion, and high nitrate concentrations. Source: Long Term Operation EIS, Chapter 7, U.S. Bureau of Reclamation (USBR)
  • Subsidence: Section 2.8 (2013); Figure 2.8 shows subsidence zones based on best available data (1973). Subsidence zones not updated due to lack of geodetic survey data. Source: Ventura County General Plan Hazards Appendix 2013


GSA Information

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