Woodland Hills Water Hardness & Quality Report (2026)

Woodland Hills, California, receives its drinking water from the Los Angeles Department of Water and Power (LADWP), the primary utility serving the San Fernando Valley in Los Angeles County. The supply blends local groundwater from wells in the Chatsworth and San Fernando basins with imported surface water from three key sources: the Los Angeles Aqueduct delivering from Owens Valley reservoirs including Haiwee and Tinemaha, the California State Water Project via the Jensen Treatment Plant, and treated Colorado River water from the Metropolitan Water District. Treatment occurs at the Jensen and Griffith Park facilities, serving over 4 million residents across 465 square miles.

The supply draws from the Owens Valley watershed in the Sierra Nevada, the Sacramento-San Joaquin Delta for State Water Project imports, and the Colorado River Basin. Locally, groundwater originates from the San Fernando Valley Groundwater Basin, underlain by Quaternary alluvium overlying older Tertiary sedimentary rocks including the Modelo and Topanga Formations. These geological features, rich in limestone, dolomite, and calcareous shales from Cenozoic marine deposits, dissolve calcium and magnesium, yielding a hard supply with elevated mineral content.

Hard water leads to significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Soap lathering is poor, leaving films on skin, hair, and laundry. Maintenance tips include regular descaling of fixtures with vinegar, installing drain screens, and flushing water heaters annually. A water softener is recommended, especially above the hard threshold. LADWP water typically has a pH of 7.5–8.5, compliant with EPA standards, with lead and copper rules met through corrosion control and 90th percentile copper below 1.3 mg/L. The 2023–2024 Consumer Confidence Report confirms all primary standards met.