Grafton Water Hardness & Quality Report (2026)

Grafton Waterworks provides drinking water to the Village of Grafton in Ozaukee County, Wisconsin. The utility operates six wells, drawing from the deep Niagara dolomite aquifer and capable of pumping up to 5.2 million gallons daily. These wells distribute water across east and west pressure zones, managed through a common system. Treatment occurs at well sites and distribution points, ensuring water meets required standards, though a central treatment plant isn't specified. The watershed is the local groundwater recharge area for the Niagara dolomite aquifer, situated in the Silurian bedrock of southeastern Wisconsin.

The water originates in the Niagara dolomite aquifer, a Silurian-period formation abundant in calcium and magnesium-bearing minerals. As groundwater travels through these carbonate rocks, it dissolves substantial amounts of these minerals, resulting in very hard water. The geological makeup of eastern Wisconsin, characterized by layers of limestone and dolomite, contributes to the high mineral content found in these aquifer systems, with well depths ranging from 500 to 600 feet.

Homeowners in Grafton will likely notice significant scale buildup in appliances like water heaters, dishwashers, and washing machines, which can decrease their efficiency and shorten their lifespan. You might also see chalky deposits on faucets and fixtures, and find that soap doesn't lather easily, requiring more detergent for cleaning. Grafton Waterworks strongly recommends installing private water softeners to combat these issues. Routine maintenance, such as deliming water heaters and flushing systems, is also advised for those not using a softener.