Saint Louis Park Water Hardness & Quality Report (2026)

Saint Louis Park, Minnesota, in Hennepin County west of Minneapolis — an inner Minneapolis west suburb known as the 'Highway 100 Corridor,' home of the Texa-Tonka commercial district, a diverse community with significant Jewish-American and Somali-American populations, birthplace of the Coen Brothers (Joel and Ethan Coen, filmmakers) and Al Franken (US Senator and comedian), and one of the Twin Cities' most walkable inner suburbs — draws its municipal water supply from the Prairie du Chien–Jordan Aquifer via the City of Saint Louis Park Water Division. Water hardness in Saint Louis Park measures 171 mg/L — classified as hard.

Saint Louis Park's hard supply reflects the Hennepin County Twin Cities calcareous dolomite platform. The Prairie du Chien–Jordan Aquifer at Saint Louis Park draws from: the Ordovician Prairie du Chien Group dolomite (the principal Twin Cities aquifer — highly calcareous dolomite of the Upper Midwest calcareous dolomite platform, subcropping at moderate depth across Hennepin County); and the Cambrian Jordan Sandstone (calcareous sandstone underlying the Prairie du Chien Group). The Twin Cities area's Prairie du Chien dolomite produces characteristically hard groundwater throughout the west Minneapolis suburban corridor, yielding the hard 171 mg/L at Saint Louis Park.

At 171 mg/L, Saint Louis Park residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. City of Saint Louis Park Water Division consistently delivers water meeting all Minnesota MDH and EPA Safe Drinking Water Act requirements.