West Coon Rapids Water Hardness & Quality Report (2026)

West Coon Rapids (Coon Rapids), Minnesota, in Anoka County on the Mississippi River north of the Twin Cities — a major northern Twin Cities suburban community — draws its municipal water supply from the Minneapolis Water Works treated Mississippi River water and some local Anoka County groundwater via the City of Coon Rapids Water Division, receiving the northwest Anoka County distribution through the Minneapolis regional water grid. Water hardness in West Coon Rapids–Coon Rapids measures 137.5 mg/L — classified as moderately hard.

Coon Rapids's moderate hardness reflects the northwest Anoka County supply blend from the Minneapolis Water Works. The Minneapolis Water Works at the Fridley Water Treatment Facility treats Mississippi River water sourced from the Minneapolis–Fridley intake, producing moderately hard supply at the Twin Cities northern distribution. Coon Rapids receives this surface water supply from the Minneapolis system, supplemented by local Anoka County Quaternary glacial drift wells (the Anoka Sand Plain aquifer — calcareous glaciofluvial sand and gravel). The 137.5 mg/L in Coon Rapids is consistent with the northwest Anoka County distribution zone — slightly harder than Maple Grove's 105.5 mg/L (Hennepin County), reflecting a higher proportion of the local calcareous Anoka Sand Plain groundwater in the Coon Rapids blend.

At 137.5 mg/L, Coon Rapids 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 Coon Rapids Water Division consistently delivers water meeting all Minnesota MDH and EPA Safe Drinking Water Act requirements.