Missouri Water Quality Ratings
TapWaterSafety has rated 14 public water systems in Missouri, serving a combined 3,692,671 residents. The statewide average grade is C.
State average grade
C
Total utilities rated
14
Population served
3,692,671
Most recent test
2024
🇪🇺 Would fail EU standards
6 of 14
Top water quality concerns in Missouri
- Haloacetic acids (HAA9) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
- Chromium (hexavalent) significantly above health guideline
- Arsenic* significantly above health guideline
Cities in Missouri
Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.
Grade distribution
All rated utilities in Missouri
Sorted by score, highest first. Click any utility to see the full grade card.
| Rank | Utility | City | Population | Score | Grade |
|---|---|---|---|---|---|
| #1 | INDEPENDENCE PWS | INDEPENDENCE | 120,000 | 83 | B |
| #2 | MO AMERICAN ST JOSEPH | ST. JOSEPH | 89,171 | 81 | B |
| #3 | LEES SUMMIT PWS | LEES SUMMIT | 99,400 | 79 | B |
| #4 | BLUE SPRINGS PWS | BLUE SPRINGS | 61,084 | 78 | B |
| #5 | MO AMERICAN JOPLIN | JOPLIN | 73,728 | 77 | B |
| #6 | KANSAS CITY PWS | KANSAS CITY | 513,800 | 75 | B |
| #7 | CITY OF COLUMBIA UTILITIES | COLUMBIA | 126,254 | 73 | C |
| #8 | MO AMERICAN ST LOUIS ST CHARLES COUNTIES | CHESTERFIELD | 1,111,000 | 73 | C |
| #9 | SPRINGFIELD PWS | SPRINGFIELD | 210,898 | 72 | C |
| #10 | Kansas City Water Authority | Kansas City | 508,000 | 72 | C |
| #11 | ST CHARLES PWS | ST. CHARLES | 73,040 | 70 | C |
| #12 | ST LOUIS CITY PWS | ST. LOUIS | 304,709 | 67 | C |
| #13 | ST CHARLES COUNTY PWSD 2 | O'FALLON | 100,587 | 65 | C |
| #14 | St. Louis Water Authority | St. Louis | 301,000 | 62 | D |