Lynwood Water Hardness & Quality Report (2026)

Lynwood, California, in southeast Los Angeles County adjacent to Compton and South Gate — a predominantly Latino working-class community — draws its municipal water supply through the City of Lynwood Water Division, sourcing from the Central Basin Municipal Water District (CBMWD) which delivers a blend of Metropolitan Water District of Southern California (MWD) imported water (Colorado River Aqueduct and State Water Project, both inherently soft sources) and local Central Basin groundwater from the Los Angeles Coastal Plain aquifer system. Water hardness in Lynwood measures 56.5 mg/L — classified as moderately soft.

Lynwood's soft supply reflects the southeast Los Angeles County Central Basin's high proportion of MWD imported water in the supply blend. The Central Basin groundwater historically faces overdraft and saltwater intrusion concerns — the Los Angeles Department of Water and Power and CBMWD manage active seawater intrusion barriers at the Dominguez Gap and West Coast Basin barrier. In the Lynwood portion of the Central Basin, the managed aquifer recharge (MAR) operations use soft MWD imported water to recharge the basin, effectively softening the groundwater blend. The resulting 56.5 mg/L finished supply is substantially softer than most of the Los Angeles region.

With hardness at 56.5 mg/L, Lynwood residents enjoy soft water with minimal scale challenges. City of Lynwood Water Division and CBMWD consistently deliver water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.