Freeport Water Hardness & Quality Report (2026)

City of Freeport Water and Sewer Department serves approximately 24,000 residents in Stephenson County, northwest Illinois. Water is sourced from multiple municipal wells drawing from deep aquifers, with no surface water intake. Key facilities include Well No. 8 and others managed under ongoing source evaluation, treated at the city's water treatment plant using aeration, filtration, chlorination, and fluoride addition before distribution through the local network.

Freeport's supply draws from the Galena-Platteville aquifer group, underlain by the St. Peter Sandstone and Ironton-Galesville formations, all of Ordovician and Cambrian-Ordovician age prevalent in northwest Illinois. These dolomite, limestone, and sandstone formations dissolve significant quantities of calcium and magnesium as groundwater percolates through carbonate-rich bedrock, producing a characteristically hard supply. Recharge areas are delineated by the Illinois EPA, with vulnerability assessments classifying most sources as low susceptibility.

Very hard water promotes scale buildup in hot water heaters, boilers, pipes, faucets, and showerheads, reducing efficiency and lifespan. Dishwashers and washing machines suffer from soap inefficiency and mineral deposits on fixtures. Regular vinegar descaling, installing aerator screens, and flushing heaters is advised; a water softener is strongly recommended to mitigate mineral accumulation and extend appliance life. Recent reports note elevated PFAS detections in certain wells, prompting quarterly monitoring, well adjustments, and plans for PFAS-free sources per Illinois EPA directives; no violations for primary contaminants have been issued, with full details in annual Consumer Confidence Reports.