Oklahoma drinking water quality
Oklahoma has 1,291 active public water systems serving 3.7 million people. 1,082 of them, 84%, had at least one EPA violation in the past three years, 402 have an unresolved violation today, and 73 are designated serious violators by the EPA.
Active systems
1,291
in 77 counties
People served
3.7M
901 community systems serve 3.7M
Violations, past 3 years
1,082
84% of active systems
Serious violators
73
113 systems carry a health flag
Largest counties
All 77 countiesLargest community water systems
All 1,291 systems| System | Serves | Status |
|---|---|---|
| Oklahoma City Oklahoma County |
644,000 | |
| Tulsa Tulsa County |
413,000 | |
| Broken Arrow Municipal Authority Tulsa County |
116,330 | |
| Norman Utilities Authority Cleveland County |
104,868 | |
| Lawton Comanche County |
92,757 | |
| Edmond Pwa Oklahoma County |
79,408 | |
| Midwest City Oklahoma County |
55,935 | |
| Moore Public Works Authority Cleveland County |
55,083 | |
| Stillwater Utilities Authority Payne County |
53,000 | |
| Enid Garfield County |
49,347 |
About the Oklahoma data
Retrieved from EPA ECHO on Oct 11, 2026. EPA records for Oklahoma systems do not include town names, so searches here match on ZIP code, street address, or county.