WaterQ

City Water Quality Rankings in Illinois

631 cities ranked by drinking water quality.

All States AL AK AZ AR CA CO CT DE FL GA HI ID IL IN IA KS KY LA ME MD MA MI MN MS MO MT NE NV NH NJ NM NY NC ND OH OK OR PA RI SC SD TN TX UT VT VA WA WV WI WY

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

Fairbanks, AK Fresno, CA San Jose, CA Sacramento, CA San Francisco, CA Houston, TX Fargo, ND
#49
Macon
County, IL
94 A
#50
Marquette Heights
County, IL
94 A
#51
Mason City
County, IL
94 A
#52
Minonk
County, IL
94 A
#53
New Athens
County, IL
94 A
#54
Odin
County, IL
94 A
#55
Pekin
County, IL
94 A
#56
Winchester
County, IL
94 A
#57
Winfield
County, IL
94 A
#58
Decatur
County, IL
93 A
#59
Glen Carbon
County, IL
93 A
#60
Gridley
County, IL
93 A
#61
Maroa
County, IL
93 A
#62
Park Ridge
County, IL
93 A
#63
Posen
County, IL
93 A
#64
Tremont
County, IL
93 A
#65
Atlanta
County, IL
92 A
#66
Bethalto
County, IL
92 A
#67
Bluford
County, IL
92 A
#68
Forreston
County, IL
92 A
#69
Galesburg
County, IL
92 A
#70
Gilberts
County, IL
92 A
#71
Hickory Hills
County, IL
92 A
#72
New Baden
County, IL
92 A

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.

Explore More Water Quality Data

State Rankings National Rankings Compare Cities All Water Systems