Morton Grove Water Hardness & Quality Report (2026)

Morton Grove, Illinois, in Cook County in the north suburban Chicago corridor between Skokie and Niles — a diverse north Cook County community with a historic main street along Lincoln Avenue and proximity to the Forest Preserves of Cook County — receives its municipal water from the Village of Morton Grove Water Division or Illinois American Water, drawing from the regional Cook County supply system. North Cook County communities access water through connections to the Chicago Water System (Lake Michigan origin) or from the Des Plaines River corridor utilities.

The moderately hard 158 mg/L hardness and TDS of 296.8 mg/L reflect north Cook County's carbonate-influenced water supply character. The Des Plaines River corridor drains from southern Wisconsin's Silurian Niagara Dolomite platform across northeastern Illinois, and the underlying dolomite aquifer contributes carbonate hardness throughout the north Cook County distribution system. Even Cook County communities on Lake Michigan supply experience mineral accumulation from the Silurian and Devonian carbonate bedrock that contacts the Chicago-area infrastructure and the lake's own carbonate basin drainage.

At 158 mg/L, Morton Grove's water is moderately hard — par for the north Chicago suburban corridor. Scale builds gradually in kettles and appliances over months, the dishwasher benefits from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling of heating appliances is the standard schedule for north Cook County households. The PFAS level of 5.6 ppt is moderate for the Chicago metro area — the north suburban Cook County corridor's pharmaceutical, chemical, and manufacturing industries contribute to the regional PFAS baseline, though Morton Grove remains below the higher levels seen in industrial south Cook and Lake County communities.