Upper Santa Ana Valley – San Timoteo
- Basin Name
- Upper Santa Ana Valley – San Timoteo
- Basin Number
- SGMA Basin Priority
- Very Low
- Critically Overdrafted
- Hydrologic Region Name
- South Coast Hydrologic Region
- Riverside, San Bernardino
Located in California’s hydrologic region, the Upper Santa Ana Valley – San Timoteo is 158,534.44 acres in size. This Very Low priority basin is home to an estimated 50,453 people (2010 value), which have been at a rate of 60.73. Upper Santa Ana Valley – San Timoteo is a(n) basin with approximately 390 wells, of which approximately 38 are water supply wells. Groundwater accounts for approximately 98 percent of the basin’s water supply.
2019: Basin boundary modification. Per DWR: It “removes areas of low permeability, well- consolidated bedrock from the basin. The revised basin boundary follows geologic contacts of alluvium and bedrock using a qualified geologic map.” Phase 2 draft priority: very low.