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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#601
La Harpe
County, IL
2 F
#602
Assumption
County, IL
0 F
#603
Breese
County, IL
0 F
#604
Brownstown
County, IL
0 F
#605
Chenoa
County, IL
0 F
#606
Crest Hill
County, IL
0 F
#607
Dawson
County, IL
0 F
#608
Edinburg
County, IL
0 F
#609
Gillespie
County, IL
0 F
#610
Kincaid
County, IL
0 F
#611
Lawrenceville
County, IL
0 F
#612
Leroy
County, IL
0 F
#613
Litchfield
County, IL
0 F
#614
Maple Park
County, IL
0 F
#615
Maywood
County, IL
0 F
#616
Menard
County, IL
0 F
#617
Milan
County, IL
0 F
#618
Mount Zion
County, IL
0 F
#619
Mt Carmel
County, IL
0 F
#620
New Douglas
County, IL
0 F
#621
Phoenix
County, IL
0 F
#622
Richton Park
County, IL
0 F
#623
Robbins
County, IL
0 F
#624
Royalton
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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