Chlorine (MRDL) violations in Oklahoma
293 active public water systems in Oklahoma had a Chlorine (MRDL) violation in the past three years, 36 of them in the latest quarter of EPA's data. What Chlorine (MRDL) is and why it matters.
Systems with a Chlorine (MRDL) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Bryan Co. Rws & Swmd #2 Bryan County |
6,270 | 4 | 0 | |
|
Perry Water & Light Dept Noble County |
5,230 | 8 | 1 | |
|
Alva Woods County |
5,208 | 5 | 1 | |
|
Lone Grove Carter County |
4,863 | 6 | 1 | |
|
Holdenville Hughes County |
4,732 | 7 | 1 | |
|
Altus Afb Jackson County |
4,617 | 3 | 0 | |
|
Grady CO Rwd #6 Grady County |
3,930 | 11 | 0 | |
|
Choctaw UA Oklahoma County |
3,926 | 3 | 1 | |
|
Wewoka Public Works Authority Seminole County |
3,450 | 7 | 1 | |
|
Elgin Pwa Comanche County |
3,300 | 9 | 1 | |
|
Tonkawa Kay County |
3,299 | 5 | 1 | |
|
Stickross Mountain Water CO Cherokee County |
3,250 | 6 | 0 | |
|
Haskell Co. Water Company Haskell County |
3,000 | 6 | 1 | |
|
Joseph Harp Corr Inst Cleveland County |
3,000 | 4 | 0 | |
|
Tishomingo Municipal Authority Johnston County |
3,000 | 7 | 0 | |
|
Mangum PWS Greer County |
2,924 | 4 | 0 | |
|
New Cordell Utility Authority Washita County |
2,903 | 5 | 0 | |
|
Calera Pwa Bryan County |
2,815 | 3 | 0 | |
|
Comanche CO Rwd #1 Comanche County |
2,800 | 3 | 1 | |
|
Jackson CO Water Corp Jackson County |
2,662 | 7 | 2 | |
|
Hominy Osage County |
2,584 | 9 | 3 | |
|
Mayes CO Rwd # 9 Mayes County |
2,578 | 6 | 2 | |
|
Bowlegs Lima Water Seminole County |
2,500 | 5 | 0 | |
|
Grady CO Rwd #7 (ninnekah) Grady County |
2,425 | 4 | 1 | |
|
Porter Pwa Wagoner County |
2,400 | 4 | 0 | |
|
Prague Lincoln County |
2,395 | 7 | 1 | |
|
Colbert Pua Bryan County |
2,312 | 5 | 0 | |
|
Wynnewood Water & Light Garvin County |
2,307 | 4 | 1 | |
|
Choctaw Co. Rwd #1 Choctaw County |
2,300 | 4 | 0 | |
|
Pawnee Pawnee County |
2,230 | 9 | 1 | |
|
Chouteau Mayes County |
2,100 | 3 | 0 | |
|
Indianola Rwd #18 Pittsburg County |
2,000 | 3 | 0 | |
|
McClain CO Rwd # 8 McClain County |
1,897 | 3 | 1 | |
|
Spiro East Water Association Le Flore County |
1,817 | 5 | 1 | |
|
Leflore Co. Consolidated Rwd #12 Le Flore County |
1,800 | 3 | 0 | |
|
Sequoyah Co. Rwd #4 Sequoyah County |
1,750 | 2 | 0 | |
|
Pittsburg Co. Rwd #14 Pittsburg County |
1,680 | 4 | 0 | |
|
Langston Pwa Logan County |
1,670 | 6 | 1 | |
|
Leflore Co. Rwd #3 Le Flore County |
1,643 | 5 | 1 | |
|
Inola Water Works INC Rogers County |
1,589 | 4 | 1 | |
|
Snyder Public Works Authority Kiowa County |
1,509 | 7 | 2 | |
|
Osage CO Rwd #21 Osage County |
1,500 | 9 | 4 | |
|
Tillman CO Rwd #1 Tillman County |
1,500 | 5 | 1 | |
|
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 | |
|
Beggs Public Works Authority Okmulgee County |
1,364 | 6 | 1 | |
|
Geary Blaine County |
1,258 | 8 | 1 | |
|
Barnsdall Osage County |
1,243 | 7 | 1 | |
|
Okeene Blaine County |
1,240 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Chlorine (MRDL), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Chlorine (MRDL) 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.