Newman Water Hardness & Quality Report (2026)

Newman, California, in Stanislaus County — a Stanislaus County city adjacent to Gustine and Los Banos in the San Joaquin Valley — receives its water from the City of Newman Water Department, drawing from the San Joaquin River delta water and local groundwater through the central California distribution.

The very soft 38 mg/L hardness and low TDS of 78.6 mg/L reflect the Stanislaus County San Joaquin supply's very soft character — the Sierra Nevada granodiorite is largely insoluble, and the vast volume of Sierra Nevada snowmelt dilutes mineral content as it flows through the San Joaquin Valley aquifer system (compare Gustine CA: 36/74 in Merced County comparable; Los Banos CA: 39/82 in Merced County comparable; Newman consistent very soft from the same Stanislaus County San Joaquin River Sierra Nevada insoluble supply). The Central Valley supply — Sierra Nevada granodiorite (insoluble — primary dilutant), Quaternary San Joaquin alluvium (slightly calcareous — primary hardness contributor), and Holocene San Joaquin River alluvium (slightly calcareous — minor TDS).

At 38 mg/L with TDS 79, Newman's water is very soft — virtually no scale buildup. Soft water can be mildly corrosive — monitor for copper staining in older plumbing. The PFAS level of 3.1 ppt is low — a clean result for the San Joaquin Valley. Review the City of Newman's annual water quality report.