Burnsville Water Hardness & Quality Report (2026)

Burnsville, Minnesota, in Dakota County — a major south Twin Cities suburban hub at the I-35W and I-35E split junction, one of the largest cities in the south metro — draws its municipal water supply from deep bedrock groundwater wells via the City of Burnsville Public Works Water Division, accessing the Jordan Sandstone (Upper Cambrian) and Prairie du Chien Group (Lower Ordovician — Oneota Dolomite) aquifer system beneath Dakota County. Water hardness in Burnsville measures 217 mg/L — classified as very hard.

Burnsville's very hard supply reflects the Prairie du Chien Group dolomite aquifer — consistent with the south and southeast Twin Cities Metro deep bedrock pattern (Woodbury: 220.5 mg/L, Eagan: 208 mg/L, Eden Prairie: 241 mg/L). The Prairie du Chien Oneota Dolomite ($CaMg(CO_3)_2$) beneath Dakota County is a reactive calcareous dolomite in contact with groundwater at 400–600 feet depth. Burnsville relies exclusively on the deep Prairie du Chien–Jordan Sandstone aquifer for its supply — the south metro location means no blending with Minneapolis surface water, maintaining the pure deep dolomite groundwater at the characteristic 200–240 mg/L range of the south Metro aquifer zone.

At 217 mg/L, Burnsville residents face significant hard water challenges. Scale deposits form rapidly on all fixtures and tile — monthly descaling with citric acid solution is essential maintenance. City of Burnsville Public Works Water Division consistently delivers water meeting all Minnesota MDH and EPA Safe Drinking Water Act requirements.