WaterQ

City Water Quality Rankings in Illinois

635 cities ranked by drinking water quality.

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Popular city water quality comparisons

Alto Pass, IL vs Aurora, IL Compare → Beach Park, IL vs Cahokia Heights, IL Compare → Chatham, IL vs Davis Junction, IL Compare → Evanston, IL vs Forrest, IL Compare →

Trending Cities

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#625
Mount Zion
County, IL
0 F
#626
Phoenix
County, IL
0 F
#627
Richton Park
County, IL
0 F
#628
Robbins
County, IL
0 F
#629
Royalton
County, IL
0 F
#630
Sauk Village
County, IL
0 F
#631
Silvis
County, IL
0 F
#632
St Rose
County, IL
0 F
#633
Staunton
County, IL
0 F
#634
Steeleville
County, IL
0 F
#635
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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