Maywood Water Hardness & Quality Report (2026)

Maywood Mutual Water Company #3 (and related systems #1 and #2) serves approximately 9,500 people across Maywood and nearby areas in Los Angeles County, California. The utility operates multiple groundwater wells including Well #4, Maywood Avenue Well, and 52nd Street Well, with no surface water intake or treatment plants. Water is drawn from local aquifers with basic disinfection applied as indicated in available reports. The utility is located at 6151 Heliotrope Avenue, Maywood, CA 90270, and can be reached at 323-560-3657.

The supply originates in the Los Angeles River watershed, recharging the Central Groundwater Basin's shallow alluvial aquifers through infiltration of surface flows and precipitation. Geology comprises unconsolidated Quaternary alluvial sediments — sands and gravels derived from the upstream San Gabriel Mountains — overlying Pliocene-Pleistocene formations rich in carbonates. This mineralised geology dissolves hardness ions during groundwater flow, yielding a hard supply also prone to elevated manganese from natural basin sediments.

Very hard water leads to significant scale buildup in pipes, water heaters, dishwashers, washing machines, and faucets, reducing efficiency and lifespan. Appliances may require two to three times more detergent and energy, with visible spots on dishes and films on fixtures. Maintenance includes regular descaling of heaters every 6–12 months, installing sediment filters, and flushing systems; a water softener is strongly recommended. Water quality shows manganese exceedances of the Secondary MCL (50 µg/L) in several wells — Well #4 at 82.2 µg/L, Maywood Avenue at 61.7 µg/L, 52nd Street at 73.3 µg/L — causing discoloration and taste issues; CADPH requires manganese treatment or blending plans.