Fernway Water Hardness & Quality Report (2026)

Fernway District, served by American Water, draws its drinking water from Lake Michigan. This supply is managed through a purchased water agreement with the City of Chicago, with distribution handled by the villages of Oak Lawn and Tinley Park. The utility operates the Fernway treatment plant, utilizing two offshore intakes designed to reduce risks from shoreline contamination. The Fernway treatment plant is the central facility for processing this vital resource for residents in its defined service territory within the Chicago metropolitan area.

The water's journey begins in the Lake Michigan watershed. This extensive area drains ancient Paleozoic bedrock formations, notably Silurian and Devonian dolomite and limestone, alongside Pleistocene glacial deposits. As water naturally filters through these carbonate-rich geological layers, it dissolves significant amounts of calcium and magnesium. The geology of the Great Lakes basin is defined by these strata, which consistently contribute to the characteristic hardness of the water found throughout the region.

This hard water supply predictably leads to mineral scale buildup within appliances like water heaters, dishwashers, and washing machines, as well as in household plumbing fixtures. You'll likely find that soaps and detergents are less effective, necessitating larger amounts for cleaning tasks. Homeowners might notice diminished water pressure over time due to mineral deposits accumulating in faucet aerators and showerheads, and the lifespan of appliances can be shortened. To lessen these impacts, installing a whole-house or point-of-use water softener is often advised, especially for households with substantial hot water usage. The Fernway District publishes detailed water quality information, including treatment results and compliance data, in its annual Consumer Confidence Report.