Saint Cloud Water Hardness & Quality Report (2026)

Saint Cloud, Minnesota, the Stearns County seat on the Mississippi River — Minnesota's 10th largest city and a regional hub of the St. Cloud metropolitan statistical area — draws its municipal water supply from a blend of Mississippi River surface water and local groundwater wells via the City of Saint Cloud Public Services Water Division, treating Mississippi River water and accessing the Quaternary glacial drift aquifer above the Precambrian Saint Cloud Granite. Water hardness in Saint Cloud measures 120 mg/L — classified as moderately hard.

Saint Cloud's moderate hardness reflects the central Minnesota Mississippi River watershed and the local Quaternary glacial terrain. The Mississippi River at Saint Cloud drains the upper Minnesota headwaters region — draining the Quaternary calcareous glacial till and outwash of central Minnesota (heavy calcareous Wisconsin glaciation deposits), the Precambrian Animikie Group iron-bearing metasediments of the Iron Range, and the central Minnesota prairie terrain with calcareous loess soils. The local St. Cloud area groundwater from the Quaternary glacial drift over the Precambrian Saint Cloud Granite (a distinctive pink megacrystic biotite granite — the 'Granite City' stone of central Minnesota) contributes moderate dissolved calcium from calcareous glacial till minerals. The blend produces the moderate 120 mg/L supply.

At 120 mg/L, Saint Cloud residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. City of Saint Cloud Public Services Water Division consistently delivers water meeting all Minnesota MDH and EPA Safe Drinking Water Act requirements.