#46 of 51B
Illinois Water Quality
Illinois ranks #46 out of 51 states for tap water quality with a score of 76.8 out of 100.
Summary
Overall Score
76.8
out of 100
Cities Tested
315
cities
Cities w/ Violations
310
98% of cities
Avg Contaminants
5.2
above guidelines
Population
22.2M
people affected
Best Cities in Illinois
Pop: 177,746Score: 100
Pop: 3,470Score: 96
Pop: 386Score: 90
Pop: 876Score: 90
Pop: 30,468Score: 90
Cities Needing Improvement
Pop: 4,516Score: 70
Pop: 12,709Score: 70
Pop: 11,243Score: 70
Pop: 23,144Score: 70
Pop: 71,034Score: 70
Cities listed have the lowest water quality scores in Illinois.
Get Illinois Water Updates
We analyze new EPA data as it drops. Get the breakdown for Illinois in your inbox.
Free forever. Unsubscribe anytime. We never share your email.
Frequently Asked Questions About Illinois Water Quality
Illinois ranks #46 out of 51 states and territories for water quality with a score of 76.8 out of 100 and a grade of B. A total of 315 cities were tested across the state.
Need contact data for Illinois utilities?
Check Your City's Water Quality
See detailed water quality data and get personalized filter recommendations for your specific location.
Stay Informed About Your Water Quality
Get EPA reports, filter recommendations, and safety alerts for your area.
Join 10,000+ people protecting their families. Unsubscribe anytime.