TTHM (Total Trihalomethanes) violations in Oklahoma
349 active public water systems in Oklahoma had a TTHM (Total Trihalomethanes) violation in the past three years, 123 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Frederick Tillman County |
3,940 | 4 | 0 | |
|
Grady CO Rwd #6 Grady County |
3,930 | 11 | 0 | |
|
Pawhuska Osage County |
3,800 | 2 | 0 | |
|
Spencer Oklahoma County |
3,746 | 5 | 1 | |
|
Bristow Municipal Authority Creek County |
3,700 | 6 | 1 | |
|
McIntosh Co. Rwd #8 (texanna) McIntosh County |
3,574 | 2 | 0 | |
|
Dewey Public Works Authority Washington County |
3,490 | 2 | 0 | |
|
Checotah Pwa McIntosh County |
3,481 | 3 | 1 | |
|
Tonkawa Kay County |
3,299 | 5 | 1 | |
|
Stickross Mountain Water CO Cherokee County |
3,250 | 6 | 0 | |
|
Comanche CO Rwd #4 Comanche County |
3,000 | 2 | 0 | |
|
Eufaula Pwa McIntosh County |
2,766 | 4 | 0 | |
|
Latimer Co. Rwd #1 Latimer County |
2,750 | 3 | 0 | |
|
Fairview Major County |
2,690 | 5 | 1 | |
|
Commerce Ottawa County |
2,645 | 7 | 1 | |
|
Muskogee Co. Rwd #6 Muskogee County |
2,550 | 2 | 0 | |
|
Water Improvement District #3 Tulsa County |
2,475 | 2 | 0 | |
|
Porter Pwa Wagoner County |
2,400 | 4 | 0 | |
|
Hartshorne Pittsburg County |
2,300 | 1 | 0 | |
|
Hollis Harmon County |
2,264 | 3 | 1 | |
|
Okfuskee Co. Rwd #2 Okfuskee County |
2,250 | 1 | 0 | |
|
Pawnee Pawnee County |
2,230 | 9 | 1 | |
|
Pittsburg Co. Pwa (crowder) Pittsburg County |
2,203 | 4 | 0 | |
|
Arkoma Le Flore County |
2,180 | 2 | 0 | |
|
Krebs Utility Authority Pittsburg County |
2,051 | 3 | 0 | |
|
Adair CO Rwd #1 (cherry Tree) Adair County |
2,000 | 1 | 0 | |
|
Wagoner Co. Rwd #2 Wagoner County |
2,000 | 10 | 0 | |
|
Western Carter CO Water Corp Carter County |
2,000 | 2 | 1 | |
|
McIntosh Co. Rwd #5 McIntosh County |
1,900 | 4 | 0 | |
|
Okmulgee Co. Rwd #1 Okmulgee County |
1,890 | 4 | 0 | |
|
Okfuskee Co. Rwd #3 Okfuskee County |
1,823 | 1 | 0 | |
|
Leflore Co. Consolidated Rwd #12 Le Flore County |
1,800 | 3 | 0 | |
|
Hooker Texas County |
1,788 | 5 | 1 | |
|
Pawnee CO Rwd #2 Pawnee County |
1,775 | 2 | 0 | |
|
McIntosh Co. Rws & Swmd #9 McIntosh County |
1,761 | 3 | 1 | |
|
Pittsburg Co. Rwd #5 Pittsburg County |
1,750 | 2 | 0 | |
|
Comanche Public Works Authority Stephens County |
1,649 | 5 | 0 | |
|
Cherokee Alfalfa County |
1,630 | 2 | 0 | |
|
Beckham CO Rwd # 1 Beckham County |
1,595 | 2 | 0 | |
|
Osage CO Rwd #21 Osage County |
1,500 | 9 | 4 | |
|
South Delaware CO Regional Water Auth. Delaware County |
1,500 | 5 | 0 | |
|
Wagoner Co. Rwd #6 Wagoner County |
1,500 | 5 | 0 | |
|
Oilton Creek County |
1,435 | 14 | 5 | |
|
Tulsa CO W Imp Dist #14 Tulsa County |
1,400 | 4 | 0 | |
|
Washington CO Rwd #1 Washington County |
1,375 | 2 | 0 | |
|
Muskogee Co. Rwd #3 Muskogee County |
1,300 | 4 | 0 | |
|
Geary Blaine County |
1,258 | 8 | 1 | |
|
Buffalo Harper County |
1,200 | 1 | 0 | |
|
Panhandle State University Texas County |
1,200 | 5 | 1 | |
|
Pushmataha Co. Rwd #1 Pushmataha County |
1,200 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) 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.