Kewanee Water Hardness & Quality Report (2026)

The City of Kewanee Water Department provides water to about 12,547 residents in Kewanee, Henry County, Illinois. Their supply comes entirely from groundwater, drawn from wells that tap into local aquifers within the Illinois glacial till plain, influenced by the Mississippi River watershed. Water treatment takes place at the city's plant, where processes like aeration, filtration, and chlorine disinfection are used to ensure the water meets safety standards. For questions, residents can call 309-852-2611 or check the city's website for emergency contacts.

Kewanee's water geology is characterized by glacial drift situated above Ordovician and Silurian bedrock, including formations like the Ancell and Maquoketa Groups. These layers are predominantly composed of dolomite and limestone. As water percolates through and sits within these Paleozoic carbonate rocks, it dissolves significant amounts of calcium and magnesium. This prolonged interaction with the mineral-rich bedrock is why Kewanee's groundwater supply is naturally hard, a common trait for central Illinois groundwater with elevated dissolved solids.

Homeowners in Kewanee often notice scale buildup in appliances such as water heaters, dishwashers, and washing machines, which can decrease their efficiency and shorten their lifespan. You might also see white deposits on faucets and other fixtures, and find that soap doesn't lather as well. To combat this, routine maintenance like deliming appliances and flushing out hot water systems is recommended. Many residents find that installing a whole-house water softener is the best solution to prevent appliance damage and improve cleaning results. The utility has reported 3-7 contaminants exceeding EPA health guidelines in recent tests, including PFAS chemicals.