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Comprehensive water quality reports for major cities in Illinois. Access Consumer Confidence Reports, contaminant data, EPA compliance information, and historical trends for water systems across the state.
Illinois relies primarily on Lake Michigan for Chicago and northeastern suburbs. Central and southern Illinois use the Illinois and Mississippi Rivers, along with groundwater from deep sandstone aquifers. The state has abundant water resources.
Chicago operates one of the world's largest water treatment plants using Lake Michigan. Other cities employ conventional filtration and disinfection. Lead service line replacement is a major infrastructure priority across the state.
Major concern in Chicago and older cities with lead service lines. Illinois has aggressive lead service line replacement programs and enhanced monitoring.
Common in Lake Michigan and river water systems. Formed when chlorine reacts with organic matter in source water, particularly during warm months.
Naturally occurring in deep groundwater aquifers. More common in northern Illinois communities using deep sandstone aquifer wells.
Agricultural runoff affects rural areas with shallow wells. Central and southern Illinois agricultural regions most impacted.
Found near military installations, airports, and industrial areas. State has enhanced monitoring and working toward treatment solutions.
Illinois follows federal EPA regulations and has additional state requirements through the Illinois Environmental Protection Agency:
Requires all community water systems to create comprehensive inventories of lead service lines and prioritize replacement in high-risk areas.
Stricter requirements for corrosion control treatment to minimize lead leaching from pipes and plumbing fixtures.
Enhanced protection for Lake Michigan intake structures and groundwater wellhead protection areas to prevent contamination.
Click any city to view detailed water quality report and Consumer Confidence Report
Bureau of Water
1021 North Grand Avenue East
Springfield, IL 62794-9276
Contact Information
Phone: (217) 782-3397
Email: epa.water@illinois.gov
Website: epa.illinois.gov/topics/water-quality
EPA Region 5 (Great Lakes)
77 West Jackson Boulevard, Chicago, IL 60604
Phone: (312) 353-2000 | Toll-free: (800) 621-8431
Select your city from the list above to view its detailed water quality report. Each report includes contaminant levels, source water information, treatment methods, and links to official Consumer Confidence Reports from your local water utility.
Illinois water systems commonly monitor for lead, disinfection byproducts (TTHMs and HAA5), radium, nitrates, and PFAS. Lead from aging infrastructure is a major concern in Chicago and older cities.
Water quality in Illinois is regulated by the Illinois Environmental Protection Agency (EPA), working in conjunction with the federal EPA to ensure drinking water safety standards are met.