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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#433
Kirkland
County, IL
64 C
#434
Mchenry
County, IL
64 C
#435
Onarga
County, IL
64 C
#436
Peoria
County, IL
64 C
#437
Seneca
County, IL
64 C
#438
Streamwood
County, IL
64 C
#439
Sullivan
County, IL
64 C
#440
Sycamore
County, IL
64 C
#441
Utica
County, IL
64 C
#442
Warren
County, IL
64 C
#443
Casey
County, IL
63 C
#444
Country Club Hills
County, IL
63 C
#445
Crestwood
County, IL
63 C
#446
Dekalb
County, IL
63 C
#447
Edwardsville
County, IL
63 C
#448
Georgetown
County, IL
63 C
#449
Harvey
County, IL
63 C
#450
Hazel Crest
County, IL
63 C
#451
Johnston City
County, IL
63 C
#452
Cobden
County, IL
62 C
#453
Mendota
County, IL
62 C
#454
New Lenox
County, IL
62 C
#455
Pleasant Hill
County, IL
62 C
#456
Roanoke
County, IL
62 C

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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