Encino Water Hardness & Quality Report (2026)

Encino, in the San Fernando Valley of Los Angeles County, California, receives water from the Los Angeles Department of Water and Power (LADWP). Sources include local groundwater from the San Fernando Groundwater Basin, imported surface water via the Los Angeles Aqueduct from Owens Valley reservoirs including Haiwee and Bouquet Canyon, and State Water Project supplies through the California Aqueduct from the Sacramento-San Joaquin Delta. Treatment occurs at plants including the Jensen and Griffith filtration facilities, serving over 465 square miles and approximately 12,000 Encino residents. Blending of roughly 50% local groundwater with 50% imported surface water is employed at the distribution level.

The watershed encompasses the Eastern Sierra Nevada for aqueduct water and local San Fernando Valley recharge areas fed by the Santa Clara River and Big Tujunga Wash. Geology features alluvial aquifers in the valley floor overlying Pleistocene to Holocene sediments from the Pico and Repetto Formations, part of the Los Angeles Forearc Basin, with recharge interacting with mineral-rich formations from surrounding mountains. Dissolution of carbonates and dolomite fragments in the basin fill imparts a hard supply character; blending with moderately mineralised imported Sierra water produces overall hard to moderately hard chemistry at Encino taps.

Hard water in Encino causes scale buildup in pipes, water heaters, dishwashers, and washing machines — water heaters may fail 30–50% sooner. Soap lathering is poor, leaving spots on dishes and dry skin or hair. Annual descaling, vinegar soaks for showerheads, and a water softener are recommended to prevent appliance damage. LADWP's annual Drinking Water Quality Reports confirm compliance; notable contaminants include low levels of hexavalent chromium and disinfection byproducts (TTHMs), managed below MCLs, with trace PFAS detections but no exceedances reported.