Mequon Water Hardness & Quality Report (2026)

Mequon Water Utility, located at 10800 N Industrial Rd., Mequon, WI 53092, serves the city of Mequon in Ozaukee County, Wisconsin. The utility purchases surface water primarily from Lake Michigan, a major Great Lakes source. No specific treatment plant names are detailed in available reports, but the system delivers treated drinking water to residential and commercial customers throughout the service area. The utility has confirmed that no lead water mains or service lines exist in its distribution infrastructure.

The Lake Michigan watershed spans multiple states, fed by rivers draining glacial till plains and forested uplands. Underlying Silurian dolomites and limestones of the Niagaran series dominate nearshore geology, slowly dissolving to impart calcium and magnesium minerals. This Paleozoic carbonate platform shapes a moderately mineralised supply; the lake's immense volume provides dilution that prevents extreme hardness, unlike concentrated groundwater flows. Glacial history from the Pleistocene epoch created the basin, contributing to low sediment loads and stable water chemistry.

Moderately hard water in Mequon causes moderate scale buildup in pipes, water heaters, and dishwashers, reducing efficiency over time. Faucets and fixtures may develop visible deposits, and laundry can feel stiff without softening. A water softener is recommended for optimal performance, especially for dishwasher use and frequent bathing; regular vinegar descaling helps appliances such as coffee makers. Water quality scores 80/100 with minor concerns and no EPA violations; treatment involves standard surface water processes including coagulation, filtration, and disinfection.