New Berlin Water Hardness & Quality Report (2026)

New Berlin, Wisconsin, in Waukesha County — a major Waukesha County suburban community west of Milwaukee, one of the largest communities in Waukesha County, a primarily residential middle-class suburban community in Milwaukee's western exurban corridor, and a diverse southeast Wisconsin community in the growing Milwaukee western suburban ring — draws its municipal water supply from the Silurian Niagara Dolomite Aquifer via the City of New Berlin Water Division. Water hardness in New Berlin measures 172 mg/L — classified as hard.

New Berlin's hard supply reflects the Waukesha County Silurian Niagara Dolomite aquifer's highly calcareous geology — the defining characteristic of southeast Wisconsin water. The Silurian Niagara Dolomite at New Berlin–Waukesha County is: a highly calcareous marine dolomite (approximately 95–98% CaMg(CO3)2 dolomite — among the most calcareous aquifer materials in Wisconsin); the dominant regional aquifer for Waukesha County; and a formation that produces inherently hard water ranging from 150–250 mg/L throughout Waukesha County. New Berlin's City treatment of the Niagara Dolomite produces the hard 172 mg/L.

At 172 mg/L, New Berlin residents face regular hard water challenges. Monthly descaling with citric acid solution is standard maintenance. City of New Berlin Water Division consistently delivers water meeting all Wisconsin DNR and EPA Safe Drinking Water Act requirements.