Water Quality in Chicago, IL
Detailed water quality data for Chicago, Illinois including contaminant levels, EPA comparisons, AquaScore™ grading, and treatment recommendations.
Water utility: City of Chicago Department of Water Management.
Water source: Lake Michigan.
Key Contaminants Found
- Chromium (hexavalent)
- Haloacetic acids (HAA5)
- Total trihalomethanes (TTHMs)
- Lead
- Chloroform
While Lake Michigan provides relatively clean source water, Chicago's aging lead service lines — estimated at over 400,000 — pose significant lead exposure risks, especially in older neighborhoods.