Fairview Heights Water Hardness & Quality Report (2026)

The Village of Fairview Heights Water Department serves approximately 17,000 residents in St. Clair County, Illinois, part of the Metro East region near St. Louis. The supply is sourced entirely from local groundwater wells tapping glacial drift and bedrock aquifers, with no surface water intake. Treatment occurs at the village's own water plant, involving clarification, chlorination, and pH adjustment; no softening is noted in available records. The system connects to broader regional infrastructure but operates independently, with annual Consumer Confidence Reports documenting compliance with Safe Drinking Water Act standards.

Groundwater originates from shallow glacial till overlying Mississippian and older bedrock in the Kaskaskia River basin influence zone. Key formations include Silurian dolomites and Ordovician limestones of the Edgewood and Galena groups, part of the Galena-Platteville Group, which form productive aquifers due to high porosity from dolomitization and fracturing. This limestone-dolomite geology naturally dissolves alkaline earth metals during recharge, yielding a hard supply characteristic of Illinois' karst-influenced interior plains, where mineral content exceeds soft water norms in 88.7% of public groundwater sources.

Very hard water promotes significant scale buildup in pipes, water heaters, dishwashers, and washing machines — heaters may fail prematurely from calcium deposits insulating elements. White residue on fixtures and spots on glassware are common. Maintenance includes regular vinegar descaling, installing sediment filters, and flushing tanks biannually; a water softener is strongly recommended to mitigate effects and extend appliance life. pH is typically 7.0–7.5 post-treatment; the utility complies with EPA lead/copper rules via corrosion control with no recent violations. Naturally elevated iron and manganese from the aquifer are addressed by filtration; treatment includes aeration/oxidation for iron removal, sedimentation, chlorination, and fluoride addition. Limited PFAS data is available, but no exceedances have been reported.