Andover Water Hardness & Quality Report (2026)

Andover, Minnesota, in Anoka County — a major north Minneapolis–St. Paul suburban community (Andover is one of the fastest-growing cities in the Twin Cities suburban area — an Anoka County community in the north suburbs along US-10 and Highway 169, with rapid residential development serving families moving out of the north Twin Cities inner-ring suburbs), a diverse Anoka County community with a primarily working-class and middle-class suburban population, adjacent to Elk River and Blaine in the north Anoka County metro, home of significant retail development along the Ramsey–Andover commercial corridor, and a community with numerous parks and outdoor recreation areas — draws its municipal water supply from the Prairie du Chien–Jordan aquifer via the City of Andover Water Division. Water hardness in Andover measures 149 mg/L — classified as moderately hard.

Andover's moderate hardness reflects the north Anoka County Twin Cities bedrock aquifer geology. The Prairie du Chien–Jordan aquifer at Andover–Anoka County draws from: the Cambrian Jordan Sandstone (calcareous-moderate); and the Ordovician Prairie du Chien Dolomite (calcareous-moderate carbonate). City of Andover applies limited softening, producing the moderate 149 mg/L.

At 149 mg/L, Andover residents encounter moderate scale accumulation. Monthly cleaning is recommended. City of Andover Water Division consistently delivers water meeting all Minnesota PCA and EPA Safe Drinking Water Act requirements.