Hollywood Water Hardness & Quality Report (2026)

The Los Angeles Department of Water and Power (LADWP) supplies Hollywood, California, as part of central Los Angeles city service areas including Silver Lake, Downtown, and South Los Angeles. Primary sources include the Los Angeles Aqueduct from Owens Valley, State Water Project imports via the California Aqueduct, Colorado River Aqueduct managed by the Metropolitan Water District of Southern California (MWD), and local groundwater from San Fernando Valley basins. Treatment occurs at facilities including the Jensen and Griffith Park plants, with blending at distribution points to balance demand across service zones.

The supply spans the Owens Valley, Sacramento-San Joaquin Delta, and Colorado River Basin watersheds. Source geology features Paleozoic limestones and dolomites in mountain source zones, granitic Sierra batholiths, and local Quaternary alluvial aquifers in the Los Angeles Basin sedimentary fill from the Puente and Fernando Formations. These deposits dissolve calcium and magnesium during surface flow and groundwater recharge, imparting a hard, mineral-rich character to the supply.

Very hard water promotes significant scale buildup in pipes, heaters, and fixtures, reducing efficiency in water heaters, dishwashers, and washing machines while shortening appliance life. Soap lathering is poor, leaving residue on dishes, drying skin, and fading laundry. Regular descaling of faucets and coffee makers is advised; installing a water softener is highly recommended to prevent damage and improve comfort. LADWP meets all state and federal standards, with daily testing at 300+ sites; chloramine disinfection is used and fluoridation at 0.6–1.2 mg/L is applied.