Sacramento Water Hardness & Quality Report (2026)

Sacramento's water is supplied by the City of Sacramento Department of Utilities, blending surface water from two river sources. The Sacramento River — fed by Shasta Lake reservoir north of the city — and the American River — fed by Folsom Lake east of Sacramento — are both drawn into bank-side treatment facilities. The E.A. Fairbairn Water Treatment Plant processes Sacramento River water, while the T.B. Simon Water Treatment Plant handles American River water, with the two streams blended in distribution before reaching Sacramento taps.

The soft hardness of 65 mg/L reflects the Sierra Nevada origins of both supply rivers. Folsom Lake, impounded on the American River, collects snowmelt draining from Cretaceous granodiorite, quartz diorite, and metamorphic basement of the central Sierra Nevada — rock formations highly resistant to chemical weathering that release minimal calcium or magnesium. The Sacramento River likewise captures snowmelt from the Klamath and southern Cascade volcanic highlands north of Redding, where andesitic and granitic bedrock contributes little dissolved mineral content. By the time the blended water reaches Sacramento taps, it carries only modest dissolved solids despite crossing the Central Valley's alluvial floor.

At 65 mg/L, Sacramento water is classified as soft — a genuine advantage for household appliances, plumbing, and personal care. Kettles and water heaters accumulate minimal scale, soap lathers readily, and glassware emerges from dishwashers without the white film common in harder-water California cities supplied by groundwater or Colorado River imports. Sacramento's water quality compares favourably to coastal Bay Area supplies and far outperforms the moderately hard water typical of the Central Valley's agricultural communities.