166 public water systems in Oklahoma were sampled in EPA's UCMR 5 programme (2023–2025); we show six PFAS and lithium. Read 2026-10-31.
13 of 166 systems had at least one sample above a 2024 federal limit; 73 had at least one PFAS found above the reporting level; 93 had none found above the reporting level.
A single sample above a 2024 limit is a measurement, not a violation. Compliance is judged on running yearly averages, and water systems have until 2029 to meet the limits. On 20 May 2026 EPA proposed giving qualifying systems until 2031 for PFOA and PFOS and removing the limits for PFHxS, PFNA and HFPO-DA; those proposals were not final when we last checked (5 Nov 2026). Counts are per system, not per person; population figures are available only for systems serving more than 25,000 people (about 1,919,738 people across those systems here). UCMR 5 was a one-time national monitoring programme (2023–2025). The results are a snapshot at the system's entry points or taps on the sample dates, not a continuous measurement and not a compliance record.
| System | People served | UCMR 5 result |
|---|---|---|
| Oklahoma City Oklahoma City | 644,000 | None detected (below the reporting level) |
| Tulsa Tulsa | 413,000 | None detected (below the reporting level) |
Pages for these are being added in stages. The data for all 166 systems is in the public dataset.
| System | People served | UCMR 5 result |
|---|---|---|
| Broken Arrow Municipal Authority Broken Arrow Municipal Authority | 116,330 | Above the 2024 limit in at least one sample |
| Norman Norman | 104,868 | Detected, below the 2024 limit |
| Lawton Lawton | 92,757 | None detected (below the reporting level) |
| Edmond Pwa - Arcadia Edmond Pwa - Arcadia | 79,408 | Above the 2024 limit in at least one sample |
| Midwest City Midwest City | 55,935 | None detected (below the reporting level) |
| Moore Moore | 55,083 | None detected (below the reporting level) |
| Stillwater Water Plant Stillwater Water Plant | 53,000 | Above the 2024 limit in at least one sample |
| Enid Enid | 49,347 | None detected (below the reporting level) |
| Muskogee Muskogee | 38,310 | None detected (below the reporting level) |
| Wagoner Co. Rwd #4 Wagoner Co. Rwd #4 | 37,658 | Above the 2024 limit in at least one sample |
| Bartlesville Bartlesville | 34,748 | None detected (below the reporting level) |
| Oklahoma University Oklahoma University | 34,000 | None detected (below the reporting level) |
| Shawnee Municipal Authority Shawnee Municipal Authority | 29,990 | None detected (below the reporting level) |
| Sand Springs Sand Springs | 28,774 | None detected (below the reporting level) |
| Ponca City Mun Water Ponca City Mun Water | 27,155 | Above the 2024 limit in at least one sample |
| Washington Co Rwd #3 (New,#1) Washington Co Rwd #3 (New,#1) | 25,375 | None detected (below the reporting level) |
| Idabel Pwa Idabel Pwa | — | None detected (below the reporting level) |
| Mccurtain Co. Rwd #8 (Mt. Fork Water) Mccurtain Co. Rwd #8 (Mt. Fork Water) | — | None detected (below the reporting level) |
| Broken Bow Pwa Broken Bow Pwa | — | None detected (below the reporting level) |
| Hugo Municipal Authority Hugo Municipal Authority | — | None detected (below the reporting level) |
| Pushmataha Co. Rwd #3 Pushmataha Co. Rwd #3 | — | None detected (below the reporting level) |
| Durant Utilities Authority Durant Utilities Authority | — | None detected (below the reporting level) |
| Bryan Co. Rws & Swmd #2 Bryan Co. Rws & Swmd #2 | — | None detected (below the reporting level) |
| Anadarko Public Works Authority Anadarko Public Works Authority | — | None detected (below the reporting level) |
| Pauls Valley Pauls Valley | — | None detected (below the reporting level) |