Carmichael Water Hardness & Quality Report (2026)

Carmichael, California, an unincorporated community in northeast Sacramento County — an older, established residential suburb adjacent to Fair Oaks and the American River Parkway — draws its municipal water supply from the Sacramento River and American River (Folsom Lake) via the Sacramento County Water Agency (SCWA), treating Sacramento and American River water for unincorporated northeast Sacramento County communities. Water hardness in Carmichael measures 122.5 mg/L — classified as moderately hard.

Carmichael's moderate hardness reflects the Sacramento County SCWA supply blend of Sacramento River surface water and American River (Folsom Lake) water. The American River at Folsom Lake drains the northern Sierra Nevada — the Jurassic–Cretaceous Smartville Ophiolite (mafic oceanic crust — some calcareous serpentinite), the Calaveras Complex Paleozoic metasediments (some calcareous limestone and phyllite), and the Cretaceous Sierra Nevada Batholith (granodiorite — calcium-poor at source). By the time the American River reaches Folsom Lake, some calcareous input from the ophiolite and Paleozoic limestone in the Sierra foothills has elevated the dissolved calcium. The Sacramento River blending further contributes calcareous Coast Range and upper Sacramento Valley input, producing the moderate 122.5 mg/L at Carmichael.

At 122.5 mg/L, Carmichael residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. Sacramento County Water Agency consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.