Ventura River Valley – Upper Ventura River

Source: CA DWR

Ventura River Valley – Upper Ventura River


  • Basin Name
  • Ventura River Valley – Upper Ventura River
  • Basin Number
  • 4-003.01
  • SGMA Basin Priority
  • Medium
  • Critically Overdrafted
  • No
  • Hydrologic Region Name
  • Southern California
  • Counties
  • Ventura
  • Adjacent Basins
  • Ventura River Valley - Lower Ventura River 4-003.02, Ojai Valley 4-002,


Located in California’s South Coast hydrologic region, the Ventura River Valley – Upper Ventura River is 5,278 acres in size. This Medium priority basin is home to an estimated 10,307 people (2010 value), which have been at a rate of -14.51.

Ventura River Valley – Upper Ventura River is a(n) basin with approximately 55 wells, of which approximately 17 are water supply wells. Groundwater accounts for approximately 41.86 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

2016: Basin boundary modification  approved

Revised basin boundary description

2018: Basin prioritization – medium. Comment: Key well hyhdrograph from groundwater budget management plan shows stable groundwater levels. Source: Groundwater Budget and Approach to a groundwater Management Plan Upper and Lower Ventura River Basin, Ventura County Watershed Protection District, 12/30/2010

To Consolidate or Coordinate: Status of the Formation of Groundwater Sustainability Agencies in California, Stanford University / Water in the West / Stanford Law School Martin Daniel Gould Center for Conflict Resolution case study, November 2016

2018 Final Basin Prioritization: Status of basin remains unchanged at medium priority.

GSA Information

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