Warren Valley

Warren Valley


  • Basin Name
  • Warren Valley
  • Basin Number
  • 7-012
  • SGMA Basin Priority
  • Very Low
  • Critically Overdrafted
  • No
  • Hydrologic Region Name
  • Colorado River
  • Counties
  • San Bernardino
  • Adjacent Basins
  • Joshua Tree 7-062,


Located in California’s hydrologic region, the Warren Valley is 17,475.73 acres in size. This Very Low priority basin is home to an estimated 17,761 people (2010 value), which have been at a rate of 51.

Warren Valley is a(n) basin with approximately 53 wells, of which approximately 15 are water supply wells. Groundwater accounts for approximately 100 percent of the basin’s water supply.

Source: CA DWR

Basin Notes

1977: Basin adjudicated

2004: Bulletin 118 basin description

2019: Basin boundary modification: Per DWR: “The basin boundary modification revises the basin boundary into alignment with the Warren Valley basin description published in Bulletin-118 (Update 2003). The modification aligns the western boundary of the Joshua Tree basin with the geographic location of the Yucca barrier, a feature that affects groundwater flow.”

Phase 2 draft priority: very low