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 |
|---|---|---|---|---|
|
Shattuck Ellis County |
1,200 | 6 | 0 | |
|
Grandfield Tillman County |
1,110 | 2 | 0 | |
|
Elmore City RW Corp Garvin County |
1,107 | 1 | 0 | |
|
Laverne Harper County |
1,097 | 4 | 0 | |
|
Sequoyah Co. Rwd #5 Sequoyah County |
1,075 | 2 | 0 | |
|
Meeker Public Works Authority Lincoln County |
1,044 | 3 | 0 | |
|
Fletcher Comanche County |
1,022 | 3 | 1 | |
|
Major County Rwd #1 Major County |
1,000 | 6 | 1 | |
|
Oklahoma State Reformatory Greer County |
999 | 5 | 1 | |
|
Pond Creek Grant County |
982 | 3 | 1 | |
|
Mack Alford Correctional Center Atoka County |
952 | 1 | 0 | |
|
Kay County Rural Water District 7 Kay County |
920 | 1 | 0 | |
|
Dewar Okmulgee County |
917 | 4 | 0 | |
|
Tyrone Texas County |
880 | 4 | 0 | |
|
West Siloam Springs Delaware County |
877 | 6 | 0 | |
|
Pittsburg Co. Rwd #9 (mcalester) Pittsburg County |
872 | 4 | 0 | |
|
Garvin CO Rwd #6 (sw Purchase) Garvin County |
862 | 1 | 0 | |
|
Tenkiller Waterworks, Inc. Cherokee County |
860 | 5 | 1 | |
|
Wellston Lincoln County |
825 | 3 | 0 | |
|
Welch Pwa Craig County |
800 | 5 | 0 | |
|
Wright City Pwa McCurtain County |
792 | 3 | 0 | |
|
Cheyenne Roger Mills County |
778 | 4 | 0 | |
|
Kay CO Rwd #5 (dale Water Corp) Kay County |
765 | 4 | 1 | |
|
Dewey CO Rwd #3 Woodward County |
755 | 4 | 2 | |
|
McCurtain Co. Rwd #2 McCurtain County |
755 | 3 | 0 | |
|
Arapaho Custer County |
748 | 3 | 0 | |
|
Kiowa Pittsburg County |
731 | 5 | 0 | |
|
Adair Mayes County |
704 | 2 | 1 | |
|
Adair CO Rwd #5 Adair County |
675 | 9 | 0 | |
|
Verden Grady County |
659 | 2 | 0 | |
|
Alex Grady County |
635 | 8 | 2 | |
|
Union City Canadian County |
618 | 2 | 0 | |
|
Elm Bend Rwd INC Nowata County |
600 | 3 | 1 | |
|
Highpoint MHP Garfield County |
600 | 4 | 0 | |
|
Konawa School Seminole County |
600 | 1 | 0 | |
|
Pottawatomie County Rwd #3 Pottawatomie County |
560 | 2 | 0 | |
|
Covington Garfield County |
553 | 3 | 1 | |
|
Dill City Washita County |
526 | 7 | 1 | |
|
Canute Washita County |
524 | 9 | 1 | |
|
Corn Pwa Washita County |
500 | 4 | 0 | |
|
Nowata CO RW & S Dist #1 Nowata County |
500 | 3 | 1 | |
|
Arnett Ellis County |
496 | 3 | 0 | |
|
Ochelata Utility Authority Washington County |
494 | 6 | 1 | |
|
Cole McClain County |
473 | 3 | 0 | |
|
Grady CO Rwd #2 Grady County |
455 | 5 | 0 | |
|
Tryon Lincoln County |
448 | 11 | 4 | |
|
Deerfield Springs Rogers County |
445 | 5 | 2 | |
|
North Miami Ottawa County |
433 | 7 | 3 | |
|
Gage Ellis County |
429 | 5 | 1 | |
|
Woods County Rwd # 1 Woods County |
426 | 5 | 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.