Muskego Water Hardness & Quality Report (2026)

The City of Muskego Public Works Department manages the municipal water supply for Muskego, Waukesha County, Wisconsin, serving approximately 25,000 residents. Water is sourced exclusively from groundwater wells tapping into local aquifers in the Silurian dolomite formations. Key facilities include multiple production wells — including Well #1, Well #3, and Well #5 — with treatment at the city's water plant involving disinfection, aeration, and corrosion control. No surface water reservoirs or rivers are used; the system draws entirely from confined and unconfined aquifers beneath the city.

The supply originates from the Muskego till plain within the broader Fox River watershed drainage basin in southeastern Wisconsin. Groundwater recharges via precipitation infiltrating glacial outwash sands, gravels, and moraines overlying Silurian-age dolomite and limestone bedrock of the Niagaran Group. This karst-influenced aquifer system, shaped by Paleozoic reefal limestones and dolostones, naturally dissolves alkaline earth minerals, resulting in a hard supply distinguished from softer northern Wisconsin waters influenced by granitic shields.

Very hard water in Muskego leads to heavy scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan — often requiring descaling every 1–2 years. Soap lathering is poor, increasing detergent use, with spotting on glassware and fixtures. A water softener is strongly recommended; maintenance includes regular salt refills and resin cleaning. The utility controls pH via orthophosphate addition, with no action level exceedances for lead and no recent PFAS detections above advisory levels; naturally occurring radium from aquifer minerals is addressed via blending and gross alpha monitoring.