Oklahoma Water Quality Ratings
TapWaterSafety has rated 10 public water systems in Oklahoma, serving a combined 2,617,381 residents. The statewide average grade is D.
State average grade
D
Total utilities rated
10
Population served
2,617,381
Most recent test
2024
🇪🇺 Would fail EU standards
3 of 10
Top water quality concerns in Oklahoma
- Haloacetic acids (HAA9) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
- Chromium (hexavalent) significantly above health guideline
- Arsenic significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
Cities in Oklahoma
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 Oklahoma
Sorted by score, highest first. Click any utility to see the full grade card.
| Rank | Utility | City | Population | Score | Grade |
|---|---|---|---|---|---|
| #1 | Tulsa Municipal Water System | Tulsa | 401,000 | 83 | B |
| #2 | Oklahoma City Department of Public Works | Oklahoma City | 655,000 | 80 | B |
| #3 | TULSA | TULSA | 413,000 | 77 | B |
| #4 | LAWTON | LAWTON | 92,757 | 74 | C |
| #5 | OKLAHOMA CITY | OKLAHOMA CITY | 644,000 | 70 | C |
| #6 | MIDWEST CITY | MIDWEST CITY | 55,935 | 66 | C |
| #7 | BROKEN ARROW MUNICIPAL AUTHORITY | BROKEN ARROW | 116,330 | 62 | D |
| #8 | EDMOND PWA | EDMOND | 79,408 | 51 | F |
| #9 | NORMAN UTILITIES AUTHORITY | NORMAN | 104,868 | 50 | F |
| #10 | MOORE PUBLIC WORKS AUTHORITY | MOORE | 55,083 | 38 | F |