Kaukauna Water Hardness & Quality Report (2026)

Kaukauna Utilities supplies water to the City of Kaukauna, Wisconsin, serving about 16,000 residents. The utility relies entirely on deep groundwater wells, drawing from aquifers within the Fox River watershed in Outagamie County. There are no major surface water intakes like rivers or reservoirs, and the water is processed at wellheads before distribution. The city itself is situated along the Fox River, a historically significant waterway in northeastern Wisconsin. This groundwater supply originates from beneath Paleozoic sedimentary rock layers, including limestone, dolomite, and shale. These formations, characteristic of the region's geology, are rich in minerals. As groundwater percolates through these underground strata, it dissolves significant amounts of calcium and magnesium, resulting in a naturally very hard water supply. The Maquoketa and Sinnipee Groups are examples of the geological units influencing this water chemistry. Homeowners in Kaukauna often notice the effects of very hard water on their plumbing and appliances. Scale buildup is a common issue, appearing in pipes, water heaters, dishwashers, and washing machines, which can decrease their efficiency and shorten their lifespan. Frequent descaling, sometimes every few months, becomes necessary. You'll also find that soap doesn't lather as well, leaving behind residue on dishes, skin, and clothes. Fixtures can develop stubborn mineral stains. To combat these problems, many households opt for water softeners, which are highly recommended for preventing appliance damage and improving the general usability of the water. While the water is very hard, Kaukauna Utilities confirms it's safe to drink, meeting EPA standards. The 2024 Annual Water Quality Report shows compliance with all regulations, including acceptable levels of pH, no issues with lead or copper, and low concentrations of iron and total dissolved solids. Disinfection is handled through chlorination at the wellheads, with additional corrosion control measures in place.