West Puente Valley Water Hardness & Quality Report (2026)

West Puente Valley, California, in Los Angeles County in the eastern San Gabriel Valley near La Puente and Industry — an unincorporated community adjacent to the City of Industry industrial corridor along the 60 Freeway — receives its municipal water from the La Puente Valley County Water District (LPVCWD), which draws from Metropolitan Water District of Southern California (MWD) imported supply and local San Gabriel Valley Municipal Water District groundwater resources. The LPVCWD serves the eastern San Gabriel Valley with a blend weighted toward softer State Water Project supply.

The soft 64.5 mg/L hardness and low TDS of 144.1 mg/L are substantially softer than the typical Los Angeles County supply, reflecting the heavy State Water Project (SWP) component in LPVCWD's MWD allocation for this service zone. The State Water Project delivers water from the Feather River in the northern Sierra Nevada — draining Sierra Nevada granodiorite and Precambrian metamorphic terrain with minimal carbonate — through the California Aqueduct to the San Gabriel Valley. The LPVCWD service area in West Puente Valley receives a MWD blend with proportionally more SWP soft water than harder Colorado River Aqueduct water, producing a finished supply significantly softer than coastal South Bay or LADWP service areas.

At 64.5 mg/L, West Puente Valley's water is soft — excellent for household appliances. Scale forms slowly over many months in kettles and appliances, soap lathers well, and the dishwasher produces clean results. Semi-annual descaling of heating appliances is adequate. The PFAS level of 3.7 ppt is favorable — West Puente Valley's position in the eastern San Gabriel Valley, while proximate to the City of Industry industrial corridor, benefits from the LPVCWD supply zone's distance from the historically worst PFAS contamination zones in the San Gabriel Valley Superfund area farther east and north.