Interim Enhanced Surface Water Treatment Rule violations in Oklahoma
69 active public water systems in Oklahoma had a Interim Enhanced Surface Water Treatment Rule violation in the past three years, 14 of them in the latest quarter of EPA's data. What Interim Enhanced Surface Water Treatment Rule is and why it matters.
Systems with a Interim Enhanced Surface Water Treatment Rule violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Chickasha Municipal Authority Grady County |
16,036 | 5 | 1 | |
|
Perry Water & Light Dept Noble County |
5,230 | 8 | 1 | |
|
Ketchum Pwa Craig County |
4,025 | 1 | 0 | |
|
Healdton Carter County |
2,785 | 1 | 0 | |
|
Hominy Osage County |
2,584 | 9 | 3 | |
|
Waurika Public Works Authority Jefferson County |
2,100 | 5 | 2 | |
|
Peggs Water Company Cherokee County |
1,925 | 3 | 1 | |
|
Osage CO Rwd #21 Osage County |
1,500 | 9 | 4 | |
|
Beggs Public Works Authority Okmulgee County |
1,364 | 6 | 1 | |
|
Barnsdall Osage County |
1,243 | 7 | 1 | |
|
Maysville Garvin County |
1,212 | 8 | 3 | |
|
Copan Pwa Washington County |
733 | 12 | 3 | |
|
Lamont Grant County |
417 | 10 | 0 | |
|
Foss Washita County |
127 | 7 | 0 | |
|
Muskogee Municipal Authority Muskogee County |
38,310 | 2 | 0 | |
|
Wagoner Co. Rwd #4 Wagoner County |
37,658 | 4 | 0 | |
|
Ardmore Carter County |
24,893 | 1 | 0 | |
|
Altus Jackson County |
18,717 | 5 | 0 | |
|
McAlester Pwa Pittsburg County |
18,206 | 5 | 0 | |
|
Southern Okla Water Corp Carter County |
11,250 | 3 | 0 | |
|
Guthrie Logan County |
9,925 | 3 | 0 | |
|
Coweta Pwa Wagoner County |
9,450 | 11 | 1 | |
|
Clinton Custer County |
8,883 | 8 | 1 | |
|
Blackwell Municipal Authority Kay County |
7,668 | 3 | 0 | |
|
Falls Creek Baptist Conference Center Murray County |
7,000 | 1 | 0 | |
|
Vinita Utilities Authority Craig County |
6,472 | 5 | 1 | |
|
Bryan Co. Rws & Swmd #2 Bryan County |
6,270 | 4 | 0 | |
|
Collinsville Tulsa County |
5,400 | 4 | 0 | |
|
Porum Pwa Muskogee County |
5,000 | 2 | 0 | |
|
Holdenville Hughes County |
4,732 | 7 | 1 | |
|
Fort Gibson Muskogee County |
4,700 | 2 | 0 | |
|
Wagoner Co. Rwd #9 Wagoner County |
4,363 | 5 | 0 | |
|
Wewoka Public Works Authority Seminole County |
3,450 | 7 | 1 | |
|
Cherokee Co. Rwd #11 Cherokee County |
3,395 | 1 | 0 | |
|
Cleveland Municipal Authority Pawnee County |
3,262 | 4 | 0 | |
|
Muldrow Pwa Sequoyah County |
3,104 | 3 | 0 | |
|
Atoka Co. Rws & Swmd #4 Atoka County |
3,000 | 5 | 0 | |
|
Haskell Co. Water Company Haskell County |
3,000 | 6 | 1 | |
|
Tishomingo Municipal Authority Johnston County |
3,000 | 7 | 0 | |
|
Davis Murray County |
2,610 | 6 | 0 | |
|
Pawnee Pawnee County |
2,230 | 9 | 1 | |
|
Pittsburg Co. Pwa (crowder) Pittsburg County |
2,203 | 4 | 0 | |
|
Creek CO Rwd # 7 Creek County |
2,100 | 5 | 1 | |
|
Krebs Utility Authority Pittsburg County |
2,051 | 3 | 0 | |
|
Warner Muskogee County |
2,020 | 3 | 1 | |
|
Coalgate Pwa Coal County |
2,005 | 6 | 0 | |
|
Wagoner Co. Rwd #2 Wagoner County |
2,000 | 10 | 0 | |
|
Gore Pwa Sequoyah County |
1,688 | 2 | 0 | |
|
Langston Pwa Logan County |
1,670 | 6 | 1 | |
|
Comanche Public Works Authority Stephens County |
1,649 | 5 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Interim Enhanced Surface Water Treatment Rule, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Interim Enhanced Surface Water Treatment Rule alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Oklahoma records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.