Inglewood Water Hardness & Quality Report (2026)

The City of Inglewood Water Department serves approximately 86% of residences and businesses in Inglewood, Los Angeles County, California, with a population of over 100,000. Water is pumped from city-owned deep groundwater wells, treated onsite, and blended with purchased surface water from the West Basin Municipal Water District (WBMWD), sourced via the Metropolitan Water District of Southern California (MWD) from the Colorado River Aqueduct and the State Water Project. The remaining 14% of the service area is supplied by Golden State Water Company and Cal America Water. Treatment at city facilities includes blending and disinfection.

The supply draws from the Los Angeles Basin watershed, combining local groundwater from the San Pedro Aquifer beneath the coastal plain with imported surface water. The aquifer taps Quaternary alluvial sediments overlying Tertiary-age Pico and Repetto Formations — unconsolidated sands, gravels, and silts rich in calcium and magnesium from weathered limestones and dolomites eroded from the San Gabriel and Santa Monica Mountains. Pleistocene marine incursions and fluvial deposition shaped this mineralised coastal plain profile, producing very hard water through prolonged contact with carbonate-rich strata.

At 218 mg/L, very hard water causes significant scale buildup in pipes, water heaters, dishwashers, washing machines, and coffee makers, reducing appliance lifespan by up to 50%. Soap lathering is poor, causing dry skin and hair, while spots appear on glassware and laundry feels stiff. Monthly vinegar descaling of faucets and showerheads, annual heater flushing, and scale-inhibiting filters are recommended. A water softener is strongly advised. The 2026 water quality grade is C (fair) per Tap Water Data, with 3 contaminants exceeding EPA health guidelines including arsenic from natural soil sources.