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All 60 cities ranked by water quality score
How Illinois's 60 cities are distributed by water quality grade
41 out of 60 cities meet or exceed a B grade for water quality
Sorted by water quality score from best to worst. Click any city for a detailed water quality report.
| Rank | City | Score | Grade |
|---|---|---|---|
| 1 | Romeoville | 98/100 | A+ |
| 2 | Naperville | 97/100 | A+ |
| 3 | Peoria | 96/100 | A+ |
| #4 | Crystal Lake | 94/100 | A |
| #5 | Wheeling | 94/100 | A |
| #6 | Joliet | 93/100 | A |
| #7 | Tinley Park | 93/100 | A |
| #8 | St. Charles | 92/100 | A |
| #9 | Calumet City | 91/100 | A |
| #10 | Carpentersville | 90/100 | A |
| #11 | Quincy | 90/100 | A |
| #12 | Arlington Heights | 89/100 | A- |
| #13 | Champaign | 89/100 | A- |
| #14 | Moline | 89/100 | A- |
| #15 | Bartlett | 87/100 | A- |
| #16 | Galesburg | 87/100 | A- |
| #17 | Berwyn | 86/100 | A- |
| #18 | Bolingbrook | 86/100 | A- |
| #19 | Granite City | 86/100 | A- |
| #20 | Oak Lawn | 86/100 | A- |
| #21 | Park Ridge | 86/100 | A- |
| #22 | Schaumburg | 86/100 | A- |
| #23 | Elmhurst | 85/100 | A- |
| #24 | North Chicago | 85/100 | A- |
| #25 | Carol Stream | 84/100 | B+ |
| #26 | Des Plaines | 84/100 | B+ |
| #27 | Buffalo Grove | 83/100 | B+ |
| #28 | Evanston | 83/100 | B+ |
| #29 | Orland Park | 83/100 | B+ |
| #30 | Chicago | 82/100 | B+ |
| #31 | Decatur | 82/100 | B+ |
| #32 | Downers Grove | 82/100 | B+ |
| #33 | Rockford | 82/100 | B+ |
| #34 | Springfield | 82/100 | B+ |
| #35 | Waukegan | 82/100 | B+ |
| #36 | Wheaton | 82/100 | B+ |
| #37 | Glenview | 81/100 | B+ |
| #38 | Elgin | 80/100 | B+ |
| #39 | Urbana | 80/100 | B+ |
| #40 | Danville | 76/100 | B |
| #41 | Cicero | 75/100 | B |
| #42 | Gurnee | 74/100 | B- |
| #43 | Lombard | 71/100 | B- |
| #44 | Addison | 70/100 | B- |
| #45 | Normal | 70/100 | B- |
| #46 | Bloomington | 69/100 | C+ |
| #47 | Rock Island | 69/100 | C+ |
| #48 | Streamwood | 69/100 | C+ |
| #49 | Algonquin | 68/100 | C+ |
| #50 | Mount Prospect | 68/100 | C+ |
| #51 | Skokie | 68/100 | C+ |
| #52 | DeKalb | 67/100 | C+ |
| #53 | Oak Park | 67/100 | C+ |
| #54 | Plainfield | 67/100 | C+ |
| #55 | Hoffman Estates | 65/100 | C+ |
| #56 | Aurora | 55/100 | C- |
| #57 | Belleville | 53/100 | D |
| #58 | Palatine | 53/100 | D |
| #59 | Oswego | 51/100 | D |
| #60 | Hanover Park | 47/100 | F |
The best water quality in Illinois is found in Romeoville with a score of 98/100 and a grade of A+. This puts Romeoville among the top-performing cities in the country for drinking water safety.
The most concerning water quality is in Hanover Park scoring 47/100 with a grade of F. Residents may want to consider home water testing and filtration options.
4 cities with D or F grades:
The statewide average score is 79/100, which is 7 points above the national average of 72/100. Over half (70%) of Illinois cities score above the national average, though some areas face challenges.
Romeoville has the best water quality in Illinois with a score of 98/100 and a grade of A+. This score is based on contaminant levels, EPA compliance history, and infrastructure quality. Romeoville ranks among the top cities nationally for water quality.
Water quality varies across Illinois. The state average score is 79/100. 68% of Illinois cities have good water quality (grade B or better). However, 4 cities have water quality concerns with a grade of D or F. Residents in those areas should consider water testing and filtration. Always check your specific city's water quality report for the most accurate local information.
Of the 60 cities tracked in Illinois, 4 cities have a D or F grade, indicating significant water quality concerns. An additional 11 cities fall in the C range, suggesting moderate issues. 42 out of 60 cities (70%) score above the national average of 72/100. Residents concerned about their water quality can check their city's detailed report for specific contaminant information.
State water quality summary and key statistics
Top 20 cities with the cleanest water
Top-ranked cities nationwide
Cities with the most concerning water
Compare water quality across all 50 states
Side-by-side water quality comparison