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 |
|---|---|---|---|---|
|
Lamont Grant County |
417 | 10 | 0 | |
|
Beaver CO Rwd #1 Turpin Beaver County |
412 | 6 | 0 | |
|
Dover Public Works Trust Auth Kingfisher County |
400 | 4 | 0 | |
|
Optima Texas County |
400 | 8 | 4 | |
|
Custer City PWS Custer County |
393 | 1 | 0 | |
|
Terral Jefferson County |
386 | 6 | 1 | |
|
Ripley Pwa Payne County |
376 | 6 | 1 | |
|
Taloga Dewey County |
372 | 3 | 0 | |
|
Barnes School Oklahoma County |
371 | 1 | 0 | |
|
Woods County Rwd # 3 Woods County |
356 | 1 | 0 | |
|
Carmen Public Works Authority Alfalfa County |
355 | 11 | 3 | |
|
Haworth Pwa McCurtain County |
354 | 5 | 1 | |
|
Osage CO Rwd #20 (hulah) Osage County |
350 | 5 | 1 | |
|
Fort Supply Pwa Woodward County |
328 | 2 | 0 | |
|
Fargo Ellis County |
326 | 7 | 1 | |
|
Kremlin-Hillsdale Rural Water District 1 Garfield County |
320 | 4 | 0 | |
|
Randlett Pwa Cotton County |
320 | 6 | 1 | |
|
Canadian CO Rws & Swmd #5 Canadian County |
316 | 1 | 0 | |
|
Craig CO Rwd #1 Craig County |
315 | 4 | 1 | |
|
Osage CO Rwd #18 (evergreen) Osage County |
302 | 4 | 2 | |
|
Arcadia Public Works Authority Oklahoma County |
300 | 2 | 0 | |
|
Hunter Garfield County |
300 | 6 | 2 | |
|
Soper Choctaw County |
300 | 2 | 0 | |
|
Lenapah Public Works Authority Nowata County |
298 | 1 | 0 | |
|
Coyle Logan County |
289 | 2 | 1 | |
|
Garfield CO Rwd #7 Garfield County |
288 | 2 | 0 | |
|
Manitou Tillman County |
278 | 6 | 1 | |
|
Hardesty Utilities Texas County |
277 | 5 | 0 | |
|
Freedom Woods County |
275 | 2 | 1 | |
|
Cherokee Co. Rwd # 16 (chicken Creek) Cherokee County |
272 | 6 | 0 | |
|
Ponca Fancy Dance Casino County |
262 | 2 | 0 | |
|
Washington CO Rwd #7 Washington County |
258 | 6 | 2 | |
|
Lee Creek Rwd Sequoyah County |
250 | 4 | 1 | |
|
Lookeba Sickles School Caddo County |
250 | 8 | 2 | |
|
Oaks Mobile Home Park Creek County |
250 | 5 | 2 | |
|
Osage Nation Industrial Park Pawhuska · County |
250 | 2 | 0 | |
|
Sequoyah Co. Rwd #5 Sequoyah County |
250 | 3 | 0 | |
|
Braman Kay County |
244 | 2 | 0 | |
|
Breckinridge Pwa Garfield County |
239 | 6 | 1 | |
|
Bixby Estates Tulsa County |
225 | 5 | 2 | |
|
Mulhall Logan County |
225 | 5 | 1 | |
|
Nowata County Rwd # 3 Nowata County |
225 | 1 | 0 | |
|
Spring Cove RV Park&marina Onlake Hudson Mayes County |
225 | 10 | 2 | |
|
Nash Grant County |
224 | 2 | 0 | |
|
Sportsmen Acres Mayes County |
218 | 2 | 0 | |
|
Aline, Town of Alfalfa County |
214 | 5 | 0 | |
|
Cherokee Co. Rwd # 16 (lakewood) Cherokee County |
200 | 4 | 0 | |
|
Cherokee Co. Rwd # 16 (wildcat) Cherokee County |
200 | 6 | 0 | |
|
Cherokee Co. Rwd # 16 (woodhaven) Cherokee County |
200 | 6 | 0 | |
|
Cherokee Co. Rwd #9 Cherokee County |
200 | 4 | 1 |
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.