Oklahoma tap water
8 of 159 Oklahoma water systems with full PFAS testing (5%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 890 active community water systems in the EPA file; 140 serve 3,300+ people and have a full PFAS set.
- 620 systems had at least one health-based violation since 2021-10-26.
- 5 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Oklahoma City | 644,000 | No | 0 |
| Tulsa | 413,000 | No | 0 |
| Broken Arrow Municipal Authority | 116,330 | Yes, at one or more sampling points | 0 |
| Norman Utilities Authority | 104,868 | No | 1 |
| Lawton | 92,757 | No | 0 |
| Edmond Pwa | 79,408 | No | 0 |
| Midwest City | 55,935 | No | 0 |
| Moore Public Works Authority | 55,083 | No | 4 |
Counties
All 10 utilities with a page in Oklahoma
- Broken Arrow Municipal Authority 116,330
- Edmond Pwa 79,408
- Enid 49,347
- Lawton 92,757
- Midwest City 55,935
- Moore Public Works Authority 55,083
- Norman Utilities Authority 104,868
- Oklahoma City 644,000
- Stillwater Utilities Authority 53,000
- Tulsa 413,000
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.