Arroyo Santa Rosa Valley

Source: CA DWR

Arroyo Santa Rosa Valley


  • Basin Name
  • Arroyo Santa Rosa Valley
  • Basin Number
  • 4-007
  • SGMA Basin Priority
  • Very Low
  • Critically Overdrafted
  • No
  • Status
  • Not Subject to SGMA
  • DWR Region & POC
  • Southern Region Office
    Anita Regmi
    (818) 549-2340

  • Number of Wells
  • 58
  • Hydrologic Region Name
  • South Coast Hydrologic Region
  • Counties
  • Ventura


Located in California’s hydrologic region, the Arroyo Santa Rosa Valley is 3,737 acres in size. This Very Low priority basin is home to an estimated 2,211 people (2010 value), which have been at a rate of -17.5. Arroyo Santa Rosa Valley is a(n) basin with approximately 58 wells, of which approximately 4 are water supply wells. Groundwater accounts for approximately 76.10 percent of the basin’s water supply.

Source: CA DWR

Basin Notes

2003: Bulletin 118 basin description

2014: CASGEM basin prioritization – medium. Note: Elevated sulfates, nitrates and TDS in the basin.

2018: Draft basin prioritization – very low. Note: 1) CASGEM/WDL/GWIDS: No data or data insufficent to determine GWL status. Source: DWR 2) GWMP says overdrafted in 1970s, mitigated for it and GWLs have been relatively stable since. Hydrographs show relatively stable hydrographs.

Basin boundary modification request.

GSA Information

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