Menasha Water Hardness & Quality Report (2026)

Menasha Utilities serves the city of Menasha in Winnebago County, Wisconsin. The utility draws surface water from Lake Winnebago, a large glacial lake in the Fox River system. Water is treated, filtered, and disinfected at the Menasha Water Filtration Plant using biological and conventional filtration before distribution through the municipal system. The utility earned recognition for water quality, winning the title of best-tasting tap water in Wisconsin in 2022 from the Wisconsin Section of the American Water Works Association. Annual Consumer Confidence Reports are published for residents.

Menasha's supply is shaped by the Fox River watershed and the underlying geology of northeastern Wisconsin. The region is underlain by Silurian and Ordovician dolomite and limestone formations typical of Wisconsin's glaciated karst terrain. These carbonate rock formations dissolve as water moves through soil and bedrock, introducing dissolved calcium and magnesium minerals. Lake Winnebago reflects this geology, resulting in a moderately hard water supply characteristic of Wisconsin's mineral-rich groundwater and surface water systems.

At moderately hard levels, residents may experience some scale buildup in kettles, coffee makers, and water heaters over time, though the impact is less severe than in hard or very hard water areas. Soap and detergent efficiency may be slightly reduced, and some spotting on dishes and glassware may occur. Water softening is recommended for those sensitive to scale or seeking to extend appliance lifespan. Menasha Utilities advises using only cold water for drinking, cooking, and baby formula preparation, and recommends flushing pipes for several minutes before use to minimize potential lead exposure from service lines.