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Water Resources
Source of Supply
West Valley Water District is composed of three water sources: groundwater, surface water and imported water.

Groundwater (46%)

The majority of our water supply comes from groundwater.  Approximately 46% of the total water supply is from the District's groundwater wells, located in five local groundwater basins:

    • Chino Basin
    • Bunker Hill Basin
    • Lytle Creek Basin
    • North Riverside Basin
    • Rialto-Colton Basin

Surface Water (13%)

The District receives approximately 13% of our total water supply from Lytle Creek in the San Bernardino Mountains, and is treated through our Oliver P. Roemer Water Filtration Facility.  The water goes through several treatment and disinfection processes prior to delivery.

Imported Water (41%)

Groundwater
The District purchased water from the Baseline Feeder Project through San Bernardino Valley Municipal Water District.  This water comes from water pumped to Rialto from wells in San Bernardino, which makes up approximately 24% of our total water supply.

Surface Water
The District also purchased approximately 17% of our total water supply from the State Water Project's Silverwood Lake reservoir through San Bernardino Valley Municipal Water District.  Also treated through our Oliver P. Roemer Water Filtration Facility.


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West Valley Water District | 855 W. Base Line Road | P.O. Box 920 | Rialto, CA 92377 | Ph: (909) 875-1804 | Fx: (909) 875-1849