Lakeville Water Hardness & Quality Report (2026)

City of Lakeville Public Utilities provides drinking water to approximately 70,000 residents in Lakeville, Minnesota, in Dakota County, southeast of Minneapolis. Water is sourced exclusively from 20 groundwater wells ranging from 460 to 864 feet deep. The central Water Treatment Facility employs chlorine, potassium permanganate, and filtration to address iron, manganese, and other issues, with fluoride added per state health guidelines, producing safe water compliant with federal and state standards.

Lakeville's supply originates from deep Cambrian-Ordovician aquifers, including the Prairie du Chien-Jordan, Tunnel City-Wonewoc, and Franconia-Ironton-Galesville formations. These sandstone, dolomite, and limestone layers dissolve substantial amounts of calcium and magnesium into groundwater over time, yielding a very hard supply at 308 mg/L. Iron and manganese are also geologically inherent to these confined bedrock aquifers, requiring oxidation treatment to prevent discoloration; the confined nature preserves consistent chemistry shaped by bedrock dissolution.

At 308 mg/L, Lakeville's very hard water causes significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. White deposits on fixtures and reduced soap lathering are common. Annual descaling is advised, and water softeners should be set to 14–16 grains per gallon to avoid over-softening corrosion. A whole-house water softener is strongly recommended to protect plumbing and appliances. Treatment achieves iron below 0.3 ppm and manganese below 0.05 ppm, with chlorine at ~0.31 ppm and fluoride at 0.74 ppm.