Kenosha Water Hardness & Quality Report (2026)

City of Kenosha Water Utility provides drinking water to Kenosha and surrounding areas in Kenosha County, Wisconsin, serving approximately 100,000 residents. Water is sourced exclusively from groundwater wells tapping deep sandstone aquifers, with key facilities including the Lance Well Field and Carol Beach wells. Raw groundwater is treated at facilities including the Somers Water Treatment Plant before distribution. Treatment includes disinfection with chlorine, corrosion control via pH adjustment and orthophosphate, and aeration and oxidation at wells to address iron and manganese. No surface water treatment plants are in operation.

The supply originates from the regional groundwater basin associated with the Lake Michigan watershed, recharged by precipitation percolating through glacial deposits and bedrock. Key geological features include Ordovician dolomites of the Sinnipee Group and underlying Cambrian sandstones — specifically the Mount Simon Sandstone and Eau Claire Formation — forming confined aquifers. Contact with Prairie du Chien Group limestone and dolomite layers and Silurian dolomite bedrock, along with glacial till, naturally dissolves minerals into the water, resulting in a hard supply characteristic of the region's carbonate rock formations.

Hard water in this range leads to significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan — water heaters may fail prematurely by 30–50%. Soap lathering is poor, leaving films on skin, hair, fixtures, and laundry. Iron traces can cause orange stains on sinks and toilets. A water softener is strongly recommended for households to mitigate these issues. Regular maintenance such as annual softener salt refills and deliming appliances extends equipment life. Typical pH is 7.2–7.8, and the utility complies with the Lead and Copper Rule.