Neenah Water Hardness & Quality Report (2026)

Neenah Water Utility serves the City of Neenah, Wisconsin, in Winnebago County, treating and distributing public drinking water to the municipality. The utility operates a Water Treatment Plant supplied primarily by surface water from Lake Winnebago, with an emergency intake in the Fox River near Riverside Park. The utility employs conventional filtration and water softening treatment methods to process the surface water before distribution. The 2024 Water Quality Report is available from the City of Neenah website or by calling (920) 886-6196, providing detailed information on contaminants detected, treatment efficacy, and compliance with EPA and Wisconsin DNR standards.

The Neenah water supply originates from Lake Winnebago, a large glacially formed lake in the Fox River watershed of eastern Wisconsin. The surrounding watershed is characterized by glaciated terrain with bedrock composed of Ordovician and Silurian dolomite and limestone formations. These carbonate rock formations naturally contribute dissolved calcium and magnesium minerals to the water, shaping the chemical character of the supply. The utility's use of softening treatment reflects the notable mineral load typical of Wisconsin's hard-water region.

Homeowners in Neenah may experience scale buildup on fixtures and appliances, reduced soap effectiveness, and potential staining from the mineral-rich supply. The utility's inclusion of softening in its treatment process reflects the water's significant mineral content from Lake Winnebago. A point-of-use or whole-house water softener is commonly recommended for households seeking to mitigate these effects, particularly for washing machines, water heaters, and dishwashers. The utility reported at least one contaminant above EPA health-based guidelines; residents are encouraged to review the annual Consumer Confidence Report for specific pH, lead/copper compliance data, and other water quality parameters.