Interim Enhanced Surface Water Treatment Rule violations in Oklahoma
69 active public water systems in Oklahoma had a Interim Enhanced Surface Water Treatment Rule violation in the past three years, 14 of them in the latest quarter of EPA's data. What Interim Enhanced Surface Water Treatment Rule is and why it matters.
Systems with a Interim Enhanced Surface Water Treatment Rule violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cherokee Alfalfa County |
1,630 | 2 | 0 | |
|
Locust Grove Pwa Mayes County |
1,600 | 5 | 0 | |
|
Wetumka Hughes County |
1,451 | 4 | 1 | |
|
Afton Pwa Ottawa County |
1,428 | 5 | 1 | |
|
Muskogee Co. Rwd #3 Muskogee County |
1,300 | 4 | 0 | |
|
Temple Cotton County |
1,146 | 4 | 0 | |
|
Hulbert Pwa Cherokee County |
1,007 | 2 | 1 | |
|
Tenkiller Waterworks, Inc. Cherokee County |
860 | 5 | 1 | |
|
International Paper McCurtain County |
848 | 4 | 0 | |
|
Kiowa Pittsburg County |
731 | 5 | 0 | |
|
Adair CO Rwd #5 Adair County |
675 | 9 | 0 | |
|
Fort Towson Choctaw County |
611 | 4 | 0 | |
|
Red Oak Pwa Latimer County |
581 | 5 | 0 | |
|
Delaware Nowata County |
456 | 5 | 2 | |
|
Latimer Co. Rwd #4 Latimer County |
412 | 3 | 0 | |
|
Sardis Lake Water Authority Pushmataha County |
307 | 4 | 0 | |
|
Spinnaker Point Estates Delaware County |
120 | 2 | 0 | |
|
Poteau Valley Improvement Authority Le Flore County |
10 | 4 | 0 | |
|
Pittsburg Co. Water Authority Pittsburg County |
5 | 6 | 2 |
About this data
A system is counted once if any of its violations in the past three years involved Interim Enhanced Surface Water Treatment Rule, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Interim Enhanced Surface Water Treatment Rule 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.