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 |
|---|---|---|---|---|
|
Sardis Lake Water Authority Pushmataha County |
307 | 4 | 0 | |
|
Red Rock Noble County |
293 | 6 | 1 | |
|
Pittsburg Pittsburg County |
280 | 5 | 1 | |
|
Kendrick Municipal Authority Lincoln County |
266 | 1 | 1 | |
|
Haskell Pwa-Swp Muskogee County |
250 | 2 | 0 | |
|
Taft Muskogee County |
250 | 3 | 0 | |
|
Choctaw Co. Rwsg & Swmd #3 Choctaw County |
235 | 3 | 0 | |
|
Texoma Hills Marshall County |
212 | 2 | 0 | |
|
Martha Jackson County |
205 | 5 | 0 | |
|
Nowata CO Rwd #2 Nowata County |
205 | 4 | 3 | |
|
Hughes Co. Rwd #3 Hughes County |
200 | 2 | 0 | |
|
McIntosh Co. Rwd #7 McIntosh County |
200 | 3 | 2 | |
|
Latimer Co. Rwd #3 Latimer County |
175 | 7 | 5 | |
|
Red Bird Pwa Wagoner County |
153 | 4 | 1 | |
|
Lone Chimney Water Association Pawnee County |
150 | 1 | 0 | |
|
Atoka Co. Rwd #1 (wardville) Atoka County |
125 | 5 | 1 | |
|
Valley Brook MHP Creek County |
114 | 3 | 2 | |
|
Tullahassee Water Wagoner County |
106 | 4 | 4 | |
|
Grayhorse Rwd Osage County |
100 | 2 | 1 | |
|
Muskogee Co. Rwd #14 Muskogee County |
60 | 5 | 4 | |
|
Oklahoma Academy Cafe Oklahoma County |
60 | 4 | 0 | |
|
Pittsburg Co. Rwd #20 (carlton Landing) Pittsburg County |
38 | 2 | 1 | |
|
Canoe Mountain Water System Cherokee County |
37 | 12 | 2 | |
|
Lawton Comanche County |
92,757 | 2 | 0 | |
|
Enid Garfield County |
49,347 | 3 | 0 | |
|
Wagoner Co. Rwd #4 Wagoner County |
37,658 | 4 | 0 | |
|
Sand Springs Tulsa County |
28,774 | 1 | 0 | |
|
Ponca City Mun Water Kay County |
27,155 | 1 | 0 | |
|
Tinker Air Force Base Oklahoma County |
24,645 | 4 | 1 | |
|
Bethany Oklahoma County |
20,307 | 4 | 0 | |
|
Altus Jackson County |
18,717 | 5 | 0 | |
|
McAlester Pwa Pittsburg County |
18,206 | 5 | 0 | |
|
Jenks Pwa Tulsa County |
16,924 | 1 | 0 | |
|
EL Reno Canadian County |
16,212 | 2 | 0 | |
|
Miami Ottawa County |
13,704 | 1 | 0 | |
|
Okmulgee Pwa Okmulgee County |
13,495 | 6 | 0 | |
|
Osu Water Plant Payne County |
13,000 | 1 | 0 | |
|
Weatherford Custer County |
10,833 | 5 | 1 | |
|
Guthrie Logan County |
9,925 | 3 | 0 | |
|
Coweta Pwa Wagoner County |
9,450 | 11 | 1 | |
|
Clinton Custer County |
8,883 | 8 | 1 | |
|
Okmulgee Co. Rwd #6 (hectorville) Okmulgee County |
8,370 | 1 | 0 | |
|
Anadarko Public Works Authority Caddo County |
6,804 | 3 | 0 | |
|
Purcell McClain County |
6,693 | 1 | 0 | |
|
Henryetta Municipal Authority Okmulgee County |
6,096 | 2 | 0 | |
|
Perry Water & Light Dept Noble County |
5,230 | 8 | 1 | |
|
Alva Woods County |
5,208 | 5 | 1 | |
|
Adamson Rwd #8 Pittsburg County |
4,221 | 1 | 0 | |
|
Nichols Hills Oklahoma County |
4,020 | 5 | 0 | |
|
Nowata Municipal Authority Nowata County |
3,971 | 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.