Baraboo Water Hardness & Quality Report (2026)

The Baraboo Waterworks supplies water to the City of Baraboo and nearby communities in Sauk County, Wisconsin, serving about 12,000 people. This municipal water comes from groundwater wells that tap into Cambrian-Ordovician aquifers located under the Baraboo Hills. The Baraboo Water Treatment Plant handles the purification process, which includes disinfection, fluoridation, and basic conditioning before the water enters the distribution system. The utility does not use any surface water sources. While the supply is within the Baraboo River watershed, it relies solely on groundwater replenished by rain and snowmelt that seeps into the Baraboo Range's glacial till and fractured bedrock.

The region's geology features Paleozoic bedrock, specifically Cambrian sandstone and Ordovician dolomite formations, sitting beneath glacial drift. These dolomitic limestones and magnesium-rich rock types are responsible for the water's very hard character, as they dissolve calcium and magnesium ions when water percolates through. The local landscape also includes karst features within the Lower Paleozoic carbonates, which further enhance mineral dissolution from the Potosi and Galena dolomites, contributing to the high mineral content typical of groundwater in south-central Wisconsin.

This very hard water significantly contributes to limescale buildup in household appliances and plumbing. You'll often find scale accumulating in pipes, water heaters, dishwashers, washing machines, and coffee makers, which can reduce their efficiency and shorten their lifespan, sometimes necessitating replacements every 5-7 years if not managed. Using soap and detergents becomes less effective, potentially leaving residue on dishes, skin, and clothing. Homeowners might consider regular descaling of fixtures with vinegar, ensuring water heaters have functional anode rods, and setting water softeners to a residual hardness of 6-8 ppm. Installing a water softener is highly recommended to prevent damage to appliances and improve overall water usability. Baraboo's water quality meets EPA standards, with typical groundwater pH ranging from 7.2 to 7.6, and the utility employs corrosion control measures to comply with lead and copper rules.