Glen Ellyn Water Hardness & Quality Report (2026)

The Glen Ellyn Water Company serves approximately 27,143 residents in Glen Ellyn, Illinois, located in DuPage County. Water is purchased as surface water from Lake Michigan, a massive reservoir supplying Chicago and over 120 suburban communities. The utility operates from 535 Duane St., Glen Ellyn, IL 60137, contactable at 630-469-5000. Treatment occurs at regional facilities before distribution, ensuring compliance with USEPA and state standards as noted in annual reports and public notices available on the official village website at glenellyn.org.

Lake Michigan forms the core watershed, part of the expansive Great Lakes system spanning multiple states. Underlying geology features Paleozoic-era dolomites and limestones, particularly Silurian formations associated with the Niagara Escarpment, which dissolve to impart calcium and magnesium into the water. This results in a hard supply through natural leaching from carbonate bedrock and interaction with glacial drift deposits. No groundwater aquifer is involved, as the supply derives entirely from this vast freshwater surface reservoir.

Hard water causes scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and increasing energy use over time. Soap lathers poorly, leaving spots on dishes and causing skin dryness. Regular descaling of appliances, installation of sediment filters, and a water softener are recommended to extend equipment life and improve cleaning effectiveness. Recent annual reports confirm compliance with nearly all USEPA and state health standards; monitoring notes trace levels of Isopropylbenzene and Naphthalene at low concentrations. The 2024 Annual Drinking Water Quality Report is available at glenellyn.org/282/Water-Quality-Reports.