Bensenville Water Hardness & Quality Report (2026)

The Village of Bensenville Public Works Department operates a municipal water utility serving approximately 18,044 residents in DuPage County, Illinois. The utility sources drinking water from purchased surface water supplies supplemented by local groundwater resources, with treatment including standard clarification and chlorination processes. An annual Consumer Confidence Report (CCR) documenting water quality and full contaminant testing results is published each year, available from the village's official website or by request from the Public Works Department at 630-350-3435.

Bensenville's water supply is influenced by the regional geology of northern Illinois, dominated by Ordovician and Silurian carbonate bedrock — primarily dolomite and limestone formations. These soluble carbonate rocks naturally dissolve into both the purchased surface water and local groundwater sources, releasing calcium and magnesium ions. The Illinois Basin aquifer and watershed systems feeding the region are characterised by this carbonate geology as the primary driver of elevated mineral content and very hard water across northern Illinois.

At the very hard level typical of this region, Bensenville residents can expect scale buildup in water heaters, boilers, and hot-water pipes; white mineral deposits on fixtures and glassware; and reduced soap and detergent effectiveness. Water softening is commonly recommended to mitigate these effects and extend appliance life; regular descaling of kettles and periodic flushing of water heaters are practical maintenance steps. The 2026 tap water quality assessment gives Bensenville a grade of B (73/100) with no EPA MCL violations reported; bromodichloromethane (a disinfection byproduct) has been detected but at levels compliant with EPA standards.