Atrazine violations in Oklahoma
110 active public water systems in Oklahoma had a Atrazine violation in the past three years. What Atrazine is and why it matters.
Health effects: Chronic exposure to atrazine is associated with endocrine disruption — particularly effects on reproductive hormones — and cardiovascular and adrenal effects in animal studies. EPA classifies atrazine as not likely to be a human carcinogen under current guidelines, though its endocrine-disrupting properties remain under research scrutiny. Fetuses and infants may be most sensitive to hormonal effects.
Systems with a Atrazine 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 | |
|
Altus Jackson County |
18,717 | 5 | 0 | |
|
Kingfisher Kingfisher County |
5,073 | 3 | 0 | |
|
Nichols Hills Oklahoma County |
4,020 | 5 | 0 | |
|
Grady CO Rwd #6 Grady County |
3,930 | 11 | 0 | |
|
Choctaw UA Oklahoma County |
3,926 | 3 | 1 | |
|
Elgin Pwa Comanche County |
3,300 | 9 | 1 | |
|
Davis Murray County |
2,610 | 6 | 0 | |
|
Oklahoma City Zoo Oklahoma County |
2,500 | 5 | 0 | |
|
Mayes CO Rwd # 3 Mayes County |
2,400 | 5 | 1 | |
|
Prague Lincoln County |
2,395 | 7 | 1 | |
|
Pawnee Pawnee County |
2,230 | 9 | 1 | |
|
Burns Flat PWS Washita County |
2,057 | 2 | 0 | |
|
US Army Ammunition Plant Pittsburg County |
1,872 | 2 | 0 | |
|
Okla Christian University Oklahoma County |
1,800 | 2 | 0 | |
|
Oilton Creek County |
1,435 | 14 | 5 | |
|
Medford Grant County |
1,172 | 3 | 0 | |
|
Laverne Harper County |
1,097 | 4 | 0 | |
|
Woodward CO Rwd #2 Woodward County |
920 | 5 | 0 | |
|
Seiling Dewey County |
860 | 2 | 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 | |
|
Vici Dewey County |
668 | 4 | 0 | |
|
Fort Cobb Caddo County |
667 | 2 | 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 | |
|
Helena Alfalfa County |
443 | 6 | 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 | |
|
Wakita Grant County |
344 | 1 | 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 |
About this data
A system is counted once if any of its violations in the past three years involved Atrazine, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Atrazine 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.