Nitrate-Nitrite (Combined) violations in Oklahoma
236 active public water systems in Oklahoma had a Nitrate-Nitrite (Combined) violation in the past three years, 8 of them in the latest quarter of EPA's data. What Nitrate-Nitrite (Combined) is and why it matters.
Systems with a Nitrate-Nitrite (Combined) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Major County Rwd #1 Major County |
1,000 | 6 | 1 | |
|
Okfuskee Co. Rwd #1 (boley) Okfuskee County |
1,000 | 5 | 2 | |
|
Waynoka Woods County |
993 | 3 | 1 | |
|
Pond Creek Grant County |
982 | 3 | 1 | |
|
Mountain View Pwa Kiowa County |
880 | 5 | 2 | |
|
Seiling Dewey County |
860 | 2 | 0 | |
|
Beckham CO Rwd # 2 Beckham County |
857 | 6 | 1 | |
|
Roger Mills Rwd # 2 (red Star) Roger Mills County |
800 | 5 | 0 | |
|
Copan Pwa Washington County |
733 | 12 | 3 | |
|
Thunder Valley Raceway Park Cleveland County |
700 | 2 | 0 | |
|
Adair CO Rwd #5 Adair County |
675 | 9 | 0 | |
|
Vici Dewey County |
668 | 4 | 0 | |
|
Alfalfa CO Rws & Swmd #1 North Alfalfa County |
600 | 2 | 1 | |
|
Alfalfa CO Rws & Swmd #1 Alfalfa County |
550 | 2 | 1 | |
|
Canute Washita County |
524 | 9 | 1 | |
|
Lake Thunderbird SP Clear Bay Cleveland County |
500 | 2 | 0 | |
|
Lake Thunderbird SP Indian Point Cleveland County |
500 | 1 | 0 | |
|
Lake Thunderbird SP Little Axe Area Cleveland County |
500 | 1 | 0 | |
|
Lake Thunderbird SP North Sentinal Cleveland County |
500 | 3 | 1 | |
|
Lake Thunderbird SP South Dam Cleveland County |
500 | 1 | 0 | |
|
West Davis Rwd Murray County |
500 | 5 | 0 | |
|
Sac & Fox Nation County |
479 | 2 | 0 | |
|
Olive School Creek County |
465 | 6 | 3 | |
|
Wynona Osage County |
450 | 4 | 1 | |
|
Tryon Lincoln County |
448 | 11 | 4 | |
|
Helena Alfalfa County |
443 | 6 | 0 | |
|
Lamont Grant County |
417 | 10 | 0 | |
|
Shidler Osage County |
404 | 2 | 0 | |
|
Dover Public Works Trust Auth Kingfisher County |
400 | 4 | 0 | |
|
Jennings Pawnee County |
400 | 5 | 1 | |
|
Seneca-Cayuga Nation Delaware County |
400 | 10 | 3 | |
|
Terral Jefferson County |
386 | 6 | 1 | |
|
Davidson Tillman County |
375 | 5 | 0 | |
|
Clinton-Sherman Industrial Airpark Washita County |
358 | 5 | 0 | |
|
Carmen Public Works Authority Alfalfa County |
355 | 11 | 3 | |
|
United Pentecostal Church Okla. Dist. Canadian County |
350 | 1 | 0 | |
|
Ralston Pawnee County |
335 | 3 | 0 | |
|
Robin Hill School Cleveland County |
330 | 4 | 0 | |
|
Cleo Springs Major County |
326 | 3 | 0 | |
|
Chisholm Springs Event Center Logan County |
325 | 2 | 0 | |
|
Kremlin-Hillsdale Rural Water District 1 Garfield County |
320 | 4 | 0 | |
|
Mill Creek Johnston County |
310 | 4 | 1 | |
|
Leon Rwd #1 (love County) Love County |
300 | 4 | 1 | |
|
Broken Horn Ranch Event Center Oklahoma County |
299 | 2 | 0 | |
|
Eagle Bluff Resort (thunderbird Resort) Cherokee County |
288 | 4 | 2 | |
|
Wildfire Estates Homeowners Cleveland County |
285 | 8 | 3 | |
|
US Gypsum Blaine County |
280 | 2 | 0 | |
|
Cherokee Co. Rwd # 16 (chicken Creek) Cherokee County |
272 | 6 | 0 | |
|
Cedar Hills Camp Caddo County |
250 | 2 | 0 | |
|
Family of Faith Pottawatomie County |
250 | 6 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate-Nitrite (Combined), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate-Nitrite (Combined) 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.