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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#457
Scott Air Force Base
County, IL
62 C
#458
Carlinville
County, IL
61 C
#459
Hillsboro
County, IL
61 C
#460
Macomb
County, IL
61 C
#461
Mascoutah
County, IL
61 C
#462
Normal
County, IL
61 C
#463
Bensenville
County, IL
60 C
#464
Berwyn
County, IL
60 C
#465
Burnham
County, IL
60 C
#466
Charleston
County, IL
60 C
#467
Diamond
County, IL
60 C
#468
Dieterich
County, IL
60 C
#469
Germantown
County, IL
60 C
#470
Gurnee
County, IL
60 C
#471
Oak Park
County, IL
60 C
#472
Bridgeport
County, IL
59 D
#473
Lake Barrington
County, IL
59 D
#474
Matteson
County, IL
59 D
#475
Benld
County, IL
58 D
#476
Calumet City
County, IL
58 D
#477
Hardwood Heights
County, IL
58 D
#478
Orion
County, IL
58 D
#479
Red Bud
County, IL
58 D
#480
Rockdale
County, IL
58 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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