New Lenox Water Hardness & Quality Report (2026)

The New Lenox Water Department serves approximately 22,574–27,690 residents across New Lenox in Will County, Illinois. The utility's primary water source is treated Lake Michigan surface water purchased from the Village of Tinley Park. Lake Michigan water is accessed via the City of Chicago's treatment plants, which process raw surface water before distribution to New Lenox residents. The utility is located at 2401 Ellis Road, New Lenox, IL 60451, and can be reached at (815) 215-4804.

The water supply draws from Lake Michigan, part of the Great Lakes watershed system shaped by Pleistocene glaciation. The underlying geology of the Lake Michigan basin includes Paleozoic sedimentary formations — primarily Ordovician and Silurian dolomites and limestones — which contribute significant dissolved minerals, particularly calcium and magnesium, to the water. This geological setting produces a hard water supply typical of Illinois and the broader Midwest region, where glacial deposits and carbonate bedrock dominate.

New Lenox's hard water causes mineral buildup in appliances, water heaters, and plumbing fixtures over time. Residents may notice reduced efficiency in dishwashers and washing machines, scale accumulation on faucets and showerheads, and increased soap consumption due to reduced lather. A water softener is recommended for households seeking to reduce these effects and extend appliance lifespan. According to the 2024 Consumer Confidence Report, the water meets EPA standards but 2 contaminants above EPA health-based guidelines have been reported in testing; residents concerned about lead exposure should contact the Water Department at (815) 215-4800 for testing. The water is treated by the City of Chicago before purchase and distribution.