Maywood Water Hardness & Quality Report (2026)

Maywood, Illinois, in Cook County west of Chicago near Melrose Park and Berwyn — a dense inner-ring suburb with a significant industrial heritage on the Des Plaines River corridor — receives its municipal water from the Village of Maywood Water Division or Illinois American Water, drawing from the regional Cook County supply system. Cook County's western suburbs access water through the Northwest Water Commission or Illinois American Water infrastructure drawing from Lake Michigan via the Chicago metropolitan water grid.

The very hard 253.5 mg/L hardness and high TDS of 633.1 mg/L are notably elevated compared to raw Lake Michigan supply (~120–140 mg/L), reflecting the Cook County western suburbs' complex water quality characteristics. The Silurian Niagara Dolomite and Devonian carbonate platform underlie western Cook County at relatively shallow depths, and the aging distribution infrastructure in communities like Maywood accumulates mineral deposits from dolomite-influenced groundwater seepage and distribution system interactions over decades. The Des Plaines River corridor, used as an auxiliary supply or flow augmentation source in some Cook County systems, draws from the highly calcareous northeastern Illinois watershed.

At 253.5 mg/L, Maywood residents face very hard water requiring proactive mineral management throughout the home. Scale accumulates rapidly in kettles and coffee machines within weeks, dishwashers leave white mineral deposits on glassware without water softener treatment, and bathroom surfaces develop calcium crust requiring regular acidic cleaning. Descaling appliances every four to six weeks is the necessary cadence. A whole-house water softener is strongly recommended for Maywood homeowners. The PFAS level of 8.8 ppt warrants use of a certified reverse osmosis filter for all drinking and cooking water.