City Water Quality Rankings in Illinois
631 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#289
Carol Stream
County, IL
74 C
#290 Creve Coeur
County, IL
74 C
#291 Cuba
County, IL
74 C
#292 East Hazel Crest
County, IL
74 C
#293 Ladd
County, IL
74 C
#294 Lynwood
County, IL
74 C
#295 Lyons
County, IL
74 C
#296 Meredosia
County, IL
74 C
#297 Minooka
County, IL
74 C
#298 Roselle
County, IL
74 C
#299 Skokie
County, IL
74 C
#300 South Chicago Heights
County, IL
74 C
#301 Springfield
County, IL
74 C
#302 Antioch
County, IL
73 C
#303 Bellwood
County, IL
73 C
#304 Crystal Lake
County, IL
73 C
#305 Deerfield
County, IL
73 C
#306 Delavan
County, IL
73 C
#307 Rantoul
County, IL
73 C
#308 River Grove
County, IL
73 C
#309 Rolling Meadows
County, IL
73 C
#310 Schiller Park
County, IL
73 C
#311 Volo
County, IL
73 C
#312 Addison
County, IL
72 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.