Franklin Water Hardness & Quality Report (2026)

Franklin Municipal Water Utility (also referred to as Franklin Water Utility) serves the City of Franklin and portions of Hales Corners in Milwaukee County, Wisconsin. The utility sources its drinking water exclusively from groundwater wells tapping into local aquifers across southeastern Wisconsin. No specific treatment plant names are detailed in the utility's annual reports, but the system undergoes standard disinfection and monitoring as required by state regulations. Recharge occurs via precipitation infiltrating glacial drift and bedrock aquifers within the Great Lakes Basin region, maintaining a consistent groundwater supply.

Franklin's groundwater originates from Paleozoic sedimentary formations, including the Cambrian Mount Simon Sandstone and Eau Claire Formation, overlain by glacial till in southeastern Wisconsin. These sandstone and dolomite layers are interbedded with limestone, and prolonged contact with carbonate-bearing strata dissolves calcium and magnesium into the water. The aquifer's confined nature limits variability, maintaining a consistently hard, mineral-rich supply shaped by ancient Ordovician and Cambrian bedrock in a karst-influenced geological setting.

At hard levels, scale buildup occurs noticeably in pipes, heaters, and fixtures, reducing the efficiency and lifespan of water heaters, dishwashers, and washing machines most severely. Soap lathering diminishes, leading to dry skin and higher detergent use. Regular descaling of appliances, installing sediment filters, and flushing hot water tanks annually are recommended. A water softener is advised to mitigate these effects and extend equipment life. Recent 2023–2024 reports confirm excellent compliance with no lead or copper test failures, with treatment involving chlorination for disinfection.