Bartlett Water Hardness & Quality Report (2026)

The Bartlett Water System, operated by the Village of Bartlett Public Works Water Division, serves approximately 113,911 residents in the Village of Bartlett, Illinois, primarily in DuPage and Cook Counties. The utility is a member of the DuPage Water Commission and receives 100% of its drinking water from Lake Michigan, allocated through the Chicago-area intake system. Water is treated at regional facilities managed by the City of Chicago Department of Water Management before distribution via the commission's infrastructure to Bartlett's service area; no local treatment plants are operated by the village itself.

The watershed is Lake Michigan, the third-largest Great Lakes by volume, fed by rivers like the Fox and Menominee within a massive multi-state basin. Underlying geology features Paleozoic-era sedimentary rocks, predominantly Silurian dolomites and limestones of the Niagaran Series that weather to release alkaline earth metals, imparting a hard character to the water. Glacial till from Pleistocene advances further influences mineral content through surface runoff and shoreline erosion, resulting in naturally mineralised water with elevated calcium and magnesium typical of carbonate terrain surface supplies.

Hard water leads to scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency, increasing energy costs, and leaving white deposits on glassware. Regular system flushing, vinegar descaling for fixtures, and sediment filters help manage effects. A water softener is recommended to improve soap efficiency and prevent dry skin or dull hair from mineral residues. The annual Water Quality Report meets Safe Drinking Water Act standards with no MCL violations as of August 2024; lead levels in 2021 testing were below the IEPA action level, though isolated 2020 elevations prompted enhanced sampling and corrosion control. Third-party sources note potential PFAS and haloacetic acids above health guidelines, though the utility reports full compliance; treatment at Chicago plants involves screening, coagulation, sedimentation, filtration, and chlorination.