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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#457
Nauvoo
County, IL
56 D
#458
Warsaw
County, IL
56 D
#459
Woodstock
County, IL
56 D
#460
Casey
County, IL
55 D
#461
Jonesboro
County, IL
55 D
#462
Libertyville
County, IL
55 D
#463
Macomb
County, IL
55 D
#464
St. Charles
County, IL
55 D
#465
Berwyn
County, IL
54 D
#466
Divernon
County, IL
54 D
#467
Forest Park
County, IL
54 D
#468
Herscher
County, IL
54 D
#469
Oregon
County, IL
54 D
#470
Pingree Grove
County, IL
54 D
#471
Pleasant Hill
County, IL
54 D
#472
Riverside
County, IL
54 D
#473
South Roxana
County, IL
54 D
#474
St Elmo
County, IL
54 D
#475
Duquoin
County, IL
53 D
#476
Galena
County, IL
53 D
#477
Wilmette
County, IL
53 D
#478
Wyoming
County, IL
53 D
#479
Annapolis
County, IL
52 D
#480
Calumet City
County, IL
52 D

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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