Hanover Park Water Hardness & Quality Report (2026)

Hanover Park Water Company, operated by the Village of Hanover Park, serves approximately 38,508 residents in the northwest Chicago suburb of DuPage and Cook Counties, Illinois. The utility purchases treated surface water from Lake Michigan via the City of Chicago's system; no local treatment plants are operated, and water arrives pre-treated with chlorine and hypochlorite disinfectants. The utility is contactable at 630-823-5600 and distributes water from 2121 W Lake Street, Hanover Park, IL 60133 to residential and commercial customers throughout the area.

The supply originates from the Lake Michigan watershed, with the lake lying atop Paleozoic bedrock including Silurian dolomite and limestone formations from the Niagaran Series. Pleistocene Wisconsinan glacial drift overlies these formations and enriches nearshore runoff with dissolved carbonates. This geology yields a hard supply driven by dolomite and limestone dissolution; the lake's expansive volume offers only limited dilution of these elevated calcium and magnesium levels, shaping a mineral-rich character typical of northern Illinois surface supplies.

Hard water promotes limescale buildup in pipes, heaters, and fixtures, reducing water heater efficiency by up to 20–30% and shortening appliance life. Kettles, dishwashers, and washing machines are most affected by white deposits and glassware spotting. Regular vinegar descaling, installing sediment filters, and choosing scale-resistant appliance models help manage buildup; a water softener is recommended for households with noticeable scale to extend plumbing longevity and improve soap efficiency. Reports indicate 5 contaminants exceeding EPA health guidelines, including potential chloroform, metribuzin, and naphthalene traces; the utility complies with lead and copper rules via corrosion control, and no specific PFAS data has been noted.