WaterQ

City Water Quality Rankings in Illinois

631 cities ranked by drinking water quality.

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Popular city water quality comparisons

Alto Pass, IL vs Beach Park, IL Compare → Cahokia Heights, IL vs Chatham, IL Compare → Davis Junction, IL vs Evanston, IL Compare → Freeport, IL vs Groveland, IL Compare →

Trending Cities

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#625
Sauk Village
County, IL
0 F
#626
Silvis
County, IL
0 F
#627
South Jacksonville
County, IL
0 F
#628
St Rose
County, IL
0 F
#629
Staunton
County, IL
0 F
#630
Steeleville
County, IL
0 F
#631
Waterloo
County, IL
0 F

Frequently Asked Questions

How are city water quality rankings calculated in Illinois?

WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.

Can I compare two cities in Illinois?

Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.

How often does WaterQ refresh city data?

City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.

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