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 |
|---|---|---|---|---|
|
Panama Pwa Le Flore County |
1,400 | 2 | 0 | |
|
Beggs Public Works Authority Okmulgee County |
1,364 | 6 | 1 | |
|
Barnsdall Osage County |
1,243 | 7 | 1 | |
|
Maysville Garvin County |
1,212 | 8 | 3 | |
|
Temple Cotton County |
1,146 | 4 | 0 | |
|
Okarche Kingfisher County |
1,110 | 2 | 1 | |
|
Wagoner Co. Rwd #7 (new) Wagoner County |
1,110 | 5 | 0 | |
|
Stringtown Pwa Atoka County |
1,105 | 2 | 0 | |
|
Quinton Pittsburg County |
1,071 | 2 | 1 | |
|
Nowata CO Rwd #7 Nowata County |
1,050 | 6 | 5 | |
|
Oakland Pwa Marshall County |
1,050 | 4 | 2 | |
|
Pushmataha Co. Rwd #2 (albion) Pushmataha County |
959 | 1 | 0 | |
|
Boswell Public Works Authority Choctaw County |
932 | 3 | 0 | |
|
Osage CO Rwd # 1 Osage County |
930 | 3 | 2 | |
|
McIntosh Co. Rwd #3 (victor) McIntosh County |
920 | 1 | 1 | |
|
Tipton Tillman County |
916 | 7 | 3 | |
|
Davenport Utility Auth Lincoln County |
881 | 2 | 1 | |
|
Choctaw Co. Rwsg & Swmd #6 Choctaw County |
850 | 5 | 3 | |
|
Payne CO Rwd #4 Payne County |
820 | 3 | 2 | |
|
Ryan Utilities Authority Jefferson County |
800 | 2 | 1 | |
|
Savanna Pittsburg County |
800 | 5 | 2 | |
|
LE Ann Water Washington County |
750 | 5 | 2 | |
|
Copan Pwa Washington County |
733 | 12 | 3 | |
|
Pushmataha Co. Rwd #5 (nashoba) Pushmataha County |
725 | 4 | 0 | |
|
Cherokee Co. Rwd #1 (ft Gibson) Cherokee County |
710 | 2 | 1 | |
|
Okmulgee Co. Rwd #21 Okmulgee County |
625 | 3 | 1 | |
|
Olustee Public Works Authority Jackson County |
607 | 3 | 0 | |
|
Red Oak Pwa Latimer County |
581 | 5 | 0 | |
|
Lincoln CO Rwd #3 Lincoln County |
575 | 3 | 2 | |
|
Keota Pwa Haskell County |
564 | 6 | 1 | |
|
Ramona Public Works Authority Washington County |
564 | 4 | 2 | |
|
Osage CO Rwd # 5 Osage County |
561 | 4 | 2 | |
|
McCurtain Municipal Authority Haskell County |
560 | 3 | 1 | |
|
Mayes CO Rwd # 7 Mayes County |
538 | 3 | 2 | |
|
Atoka Co. Rwd #2 Atoka County |
500 | 2 | 0 | |
|
West Davis Rwd Murray County |
500 | 5 | 0 | |
|
Mountain Park Public Works Auth Kiowa County |
473 | 5 | 0 | |
|
Bokoshe Pwa Le Flore County |
450 | 3 | 0 | |
|
Boynton Pwa Muskogee County |
450 | 4 | 2 | |
|
Nowata CO Rwd #6 Nowata County |
450 | 4 | 3 | |
|
Eldorado Jackson County |
446 | 2 | 1 | |
|
Duke Public Water Authority Jackson County |
425 | 2 | 0 | |
|
Leflore Co. Rwd #15 Le Flore County |
425 | 3 | 0 | |
|
Wanette Public Works Authority Pottawatomie County |
402 | 6 | 1 | |
|
Seminole Co. Rwd #1 Seminole County |
387 | 2 | 0 | |
|
Asher Util Dev Auth Pottawatomie County |
375 | 4 | 1 | |
|
Avant Utilities Authority Osage County |
361 | 4 | 1 | |
|
Indiahoma Public Works Authority Comanche County |
350 | 5 | 1 | |
|
Seminole Co. Rw&swmd #3 Seminole County |
337 | 2 | 0 | |
|
Seminole Co. Rwd #2 Seminole County |
315 | 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.