Saint Louis Park Water Hardness & Quality Report (2026)

The St. Louis Park Public Works Department operates the municipal water utility, serving approximately 50,010 residents across the city of St. Louis Park in Hennepin County, Minnesota. Water is sourced exclusively from groundwater wells tapping local aquifers in the Twin Cities metropolitan area, with no surface water component in the supply. Treatment occurs at city facilities using pre-oxidation with chlorine and filtration, with chlorine as the primary disinfectant. The utility can be reached at 952-928-2840 or via St. Louis Park City Hall at 5005 Minnetonka Boulevard.

The supply originates from the Twin Cities Groundwater Basin, recharged by precipitation percolating through glacial deposits into Paleozoic bedrock aquifers, including the Jordan Sandstone and Oneota Dolomite within the Prairie du Chien Group. These ancient carbonate rock formations dissolve over time, imparting a hard character to the water due to elevated calcium and magnesium from limestone and dolomite dissolution. Glacial history has shaped the overlying unconsolidated sediments, creating confined aquifer conditions that concentrate geological minerals over millennia.

Very hard water leads to significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. White deposits on fixtures, soap scum, and dry skin or hair are common. Regular maintenance including deliming appliances and using high-efficiency detergents helps; a water softener is strongly recommended for households to prevent scaling, improve soap lathering, and extend plumbing life. Four contaminants have exceeded EPA health-based guidelines in past tests; annual Consumer Confidence Reports from the city's website provide specifics on pH, lead/copper compliance, and PFAS monitoring.