Simazine violations in Oklahoma
101 active public water systems in Oklahoma had a Simazine violation in the past three years. What Simazine is and why it matters.
Systems with a Simazine violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Tinker Air Force Base Oklahoma County |
24,645 | 4 | 1 | |
|
Coweta Pwa Wagoner County |
9,450 | 11 | 1 | |
|
Piedmont Municipal Authority Canadian County |
7,542 | 6 | 1 | |
|
Kingfisher Kingfisher County |
5,073 | 3 | 0 | |
|
Nichols Hills Oklahoma County |
4,020 | 5 | 0 | |
|
Choctaw UA Oklahoma County |
3,926 | 3 | 1 | |
|
Elgin Pwa Comanche County |
3,300 | 9 | 1 | |
|
Commerce Ottawa County |
2,645 | 7 | 1 | |
|
Oklahoma City Zoo Oklahoma County |
2,500 | 5 | 0 | |
|
Prague Lincoln County |
2,395 | 7 | 1 | |
|
Pawnee Pawnee County |
2,230 | 9 | 1 | |
|
Burns Flat PWS Washita County |
2,057 | 2 | 0 | |
|
Okla Christian University Oklahoma County |
1,800 | 2 | 0 | |
|
Oilton Creek County |
1,435 | 14 | 5 | |
|
Shattuck Ellis County |
1,200 | 6 | 0 | |
|
Medford Grant County |
1,172 | 3 | 0 | |
|
Laverne Harper County |
1,097 | 4 | 0 | |
|
Woodward CO Rwd #2 Woodward County |
920 | 5 | 0 | |
|
Bryan Co. Rwd #9 Bryan County |
820 | 3 | 0 | |
|
Bridge Creek School Grady County |
800 | 3 | 0 | |
|
Welch Pwa Craig County |
800 | 5 | 0 | |
|
Ottawa CO Rwd #5 Ottawa County |
750 | 7 | 0 | |
|
Alex Grady County |
635 | 8 | 2 | |
|
Sooner Utilities-Tinker Town Oklahoma County |
603 | 2 | 0 | |
|
Calumet Pwa Canadian County |
600 | 4 | 0 | |
|
Washington McClain County |
600 | 2 | 0 | |
|
Arnett Ellis County |
496 | 3 | 0 | |
|
Jennings Pawnee County |
400 | 5 | 1 | |
|
Seneca-Cayuga Nation Delaware County |
400 | 10 | 3 | |
|
Clinton-Sherman Industrial Airpark Washita County |
358 | 5 | 0 | |
|
Carmen Public Works Authority Alfalfa County |
355 | 11 | 3 | |
|
Blue Quail Estates Canadian County |
350 | 2 | 0 | |
|
Ralston Pawnee County |
335 | 3 | 0 | |
|
Nicoma Park Oklahoma County |
318 | 4 | 0 | |
|
Woodward CO Rwd #1 Woodward County |
315 | 4 | 0 | |
|
Lakewood Village Delaware County |
293 | 7 | 2 | |
|
Wildfire Estates Homeowners Cleveland County |
285 | 8 | 3 | |
|
Jones State Central Middle School Oklahoma County |
280 | 5 | 2 | |
|
Roosevelt Pwa Kiowa County |
280 | 4 | 0 | |
|
Eakly Development Corp Caddo County |
277 | 4 | 0 | |
|
Lookeba Sickles School Caddo County |
250 | 8 | 2 | |
|
Breckinridge Pwa Garfield County |
239 | 6 | 1 | |
|
Spring Cove RV Park&marina Onlake Hudson Mayes County |
225 | 10 | 2 | |
|
Summit Ridge Retirement Center, Inc. Oklahoma County |
200 | 1 | 0 | |
|
Meno Major County |
195 | 3 | 1 | |
|
Sharon Utilities Woodward County |
175 | 10 | 2 | |
|
Sherwood Forest Mobile Estates Oklahoma County |
172 | 6 | 1 | |
|
Hallett Public Works Authority Pawnee County |
168 | 4 | 0 | |
|
Sooner Utilities-Crosby #1 Oklahoma County |
168 | 4 | 1 | |
|
Kenefic Bryan County |
165 | 5 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Simazine, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Simazine 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. Retrieved from ECHO on Oct 11, 2026.