Palos Heights Water Hardness & Quality Report (2026)

The Palos Heights Public Works Department supplies water to about 14,442 residents in Palos Heights, Illinois. This treated surface water originates from Lake Michigan and is purchased from the City of Chicago's extensive treatment system. The water enters the Palos Heights system after purification at Chicago's facilities, with Palos Heights managing local distribution from its West College Drive location. No local reservoirs or groundwater wells are part of this supply chain; service is confined strictly within the municipal limits.

The Lake Michigan basin, where the water originates, is characterized by glacial deposits overlaying Paleozoic bedrock, including Silurian and Devonian dolomite, limestone, and shale. The water's chemistry is influenced by its relatively short time in the oligotrophic lake, which limits the leaching of minerals. This setting contributes to the water's naturally soft quality, especially when contrasted with groundwater sources in other parts of Illinois where prolonged contact with limestone bedrock can lead to harder water.

For homeowners, this soft water generally means less scale buildup on appliances like coffee makers, dishwashers, and water heaters, potentially extending their lifespan and improving efficiency. You'll likely notice less spotting on glassware and softer feeling laundry. While significant descaling efforts aren't usually necessary, using low-flow aerators can still be beneficial. If you prefer the feel of softer water or have very sensitive appliances, a whole-house water softener could still be considered. Palos Heights water, treated by Chicago, meets all state and federal drinking water standards, with trace levels of certain contaminants monitored and kept below maximum contaminant limits.