Upper Santa Ana Valley – Riverside-Arlington

Source: CA DWP

Upper Santa Ana Valley – Riverside-Arlington



Located in California’s South Coast hydrologic region, the Upper Santa Ana Valley – Riverside-Arlington is 56,563 acres in size. This Very Low priority basin is home to an estimated 337,000 people (2010 value), which have been at a rate of 13.95.

Upper Santa Ana Valley – Riverside-Arlington is a(n) basin with approximately 685 wells, of which approximately 38 are water supply wells. Groundwater accounts for approximately 76.92 percent of the basin’s water supply.

Source: CA DWP
Source: CA DWP

Basin Notes

2003: Bulletin 118 basin description

65.80% adjudicated basin

2014: CASGEM basin prioritization – high. Comment: Water quality degradation issues known in several public supply wells.

2016:  Basin boundary modified along with boundaries of Yucaipa 8-002.07, Bunker Hill 8-002.06, Rialto-Colton 8-002.04 subbasins to align with adjudicated areas

Revised basin boundary description

2018: Draft basin priority – high. Comment: 1) CASGEM/WDL/GWIDS: Longterm hydrographs show groundwater level decline. Source: DWR 2) Hydrographs of water levels at 3 selected wells, shown on Figures 2.7 and 2.8, demonstrate water level changes over time through different hydrologic conditions. Generally, these hydrographs show increasing water levels starting around 1960 and stabilizing or declining somewhat after the 1980s. Source: Arlington Basin Groundwater Management Plan, 2011

References: Santa Ana Watershed Project Authority

2018 Final Basin Prioritization: Basin priority changed from high to very low.

GSA Information

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