Lakeville Water Hardness & Quality Report (2026)

Lakeville, Minnesota, in southern Dakota County — one of the fastest-growing cities in Minnesota, a major south Twin Cities suburban hub on I-35 near the Vermillion River — draws its municipal water supply from deep bedrock groundwater wells and some Quaternary glacial aquifer wells via the City of Lakeville Public Works Water Division, accessing the Jordan Sandstone (Upper Cambrian) and Prairie du Chien Group (Lower Ordovician) aquifer system beneath southern Dakota County. Water hardness in Lakeville measures 117.5 mg/L — classified as moderately hard.

Lakeville's supply is moderately hard at 117.5 mg/L — substantially lower than neighboring Burnsville (217 mg/L) or Eagan (208 mg/L) — reflecting Lakeville's blend of deep Prairie du Chien dolomite wells with some shallower Quaternary glacial aquifer wells. The southern Dakota County geology includes the Des Moines Lobe glacial outwash (Quaternary calcareous sand and gravel from the last Wisconsin glaciation) that overlies the deep bedrock. Lakeville's supply blend with shallower glacial well water — which has lower mineral content than the deep Prairie du Chien dolomite — produces the more moderate 117.5 mg/L compared to cities relying exclusively on the deep dolomite aquifer.

At 117.5 mg/L, Lakeville 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 Lakeville Public Works Water Division consistently delivers water meeting all Minnesota MDH and EPA Safe Drinking Water Act requirements.