Tracy Water Hardness & Quality Report (2026)

Tracy, California, a San Joaquin County city at the edge of the East Bay hills and the Central Valley floor — at the gateway between the Bay Area and the Central Valley — draws its municipal water supply through the City of Tracy Public Services Water Division, sourcing from the South San Joaquin Irrigation District (SSJID) treated water and the Delta-Mendota Canal (federal Central Valley Project water delivery from the Sacramento–San Joaquin Delta) in San Joaquin County. Tracy sits at the southwestern edge of the San Joaquin Valley, close to the Delta water source. Water hardness in Tracy measures 70.5 mg/L — classified as moderately soft.

Tracy's moderately soft supply reflects the dominance of Delta water in the South San Joaquin Irrigation District service area at the west San Joaquin Valley margin. The Sacramento–San Joaquin Delta receives blended water from the Sacramento River (Northern Sierra Nevada snowmelt — very soft) and the San Joaquin River (central Sierra Nevada snowmelt, moderately soft) — both originating in crystalline Sierra Nevada terrain (granodiorite and metamorphic rock, calcium-poor). The Delta water delivered to Tracy via the Delta-Mendota Canal retains this moderate softness from the Sierra Nevada source character, with limited additional mineral accumulation in the western San Joaquin Valley delivery system.

With hardness at 70.5 mg/L, Tracy residents experience minimal to moderate scale challenges. Faucet aerators and showerheads develop deposits slowly — bi-monthly cleaning with citric acid solution is sufficient. Dishwashers produce clean glassware. City of Tracy Public Services and South San Joaquin Irrigation District consistently deliver water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.