States → Oklahoma
State profile · EPA SDWIS + UCMR5
Oklahoma Drinking Water Quality
1,262 public water systems serve 3,699,452 people across Oklahoma, with every Safe Drinking Water Act violation and UCMR5 PFAS result on record.
- 1,262
- Water systems
- 336,706
- Total violations
- 98.2%
- Systems w/ a violation
- 60.8%
- PFAS detection rate
The verdict
Across Oklahoma, 1,239 of 1,262 water systems (98.2%) carry at least one EPA violation, and 101 of 166 UCMR5-tested systems show PFAS.
- 336,706
- Total EPA violations on record
- 34%
- Health-based (MCL / treatment)
- 98.2%
- Systems with ≥1 violation
- 60.8%
- UCMR5 PFAS detection rate
Water Systems
1,262
Total Violations
336,706
Violation Rate
98.2%
PFAS Detection
60.8%
101 of 166 tested
Violation Composition
How Oklahoma's 336,706 violations break down by type, per EPA SDWIS classification.
Health-based (113,804) Monitoring/Reporting (222,902)
| Metric | Value | Share |
|---|---|---|
| Public water systems | 1,262 | - |
| Population served | 3,699,452 | - |
| Total violations | 336,706 | 100% |
| Health-based violations | 113,804 | 33.8% |
| Systems with violations | 1,239 | 98.2% |
| PFAS detection rate | 101 of 166 | 60.8% |
Health-based violations indicate the contaminant exceeded an EPA Maximum Contaminant Level (MCL) or treatment-technique requirement. Monitoring/reporting violations indicate procedural issues (missed tests, late reports) - not necessarily a contamination event.
Largest Water Systems
Oklahoma City
Oklahoma City, OK · 644,000 served
Tulsa
Tulsa, OK · 413,000 served
Broken Arrow Municipal Authority
Broken Arrow, OK · 116,330 served
Norman Utilities Authority
Norman, OK · 104,868 served
Lawton
Lawton, OK · 92,757 served
Edmond PWA
Edmond, OK · 79,408 served
Midwest City
Midwest City, OK · 55,935 served
Moore Public Works Authority
Moore, OK · 55,083 served
Stillwater Utilities Authority
Stillwater, OK · 53,000 served
Enid
Enid, OK · 49,347 served
Muskogee
Muskogee, OK · 38,310 served
Bartlesville
Bartlesville, OK · 34,748 served
Oklahoma University
Norman, OK · 34,000 served
Shawnee Municipal Authority
Shawnee, OK · 29,990 served
Sand Springs
Sand Springs, OK · 28,774 served
Ponca City Mun Water
Ponca City, OK · 27,155 served
Wagoner Co. RWD #4
Broken Arrow, OK · 25,792 served
Washington Co RWD #3 (New,#1)
Collinsville, OK · 25,375 served
Ardmore
Ardmore, OK · 24,893 served
Tinker Air Force Base
Oklahoma City, OK · 24,645 served
Most Violations
#1 Timber Creek MHP East & West McLoud
9,081 #2 Eastside MHP Tuttle
7,572 #3 Prague Prague
4,153 #4 Pine Country Living MHP McLoud
2,879 #5 Walnut Park Estates Prue
2,854 #6 Rock Creek Edmond
2,734 #7 Brooksville Tecumseh
2,724 #8 Oilton Oilton
2,466 #9 Barnsdall Barnsdall
2,431 #10 Canoe Mountain Water System Vian
2,053 #11 Abes RV Park Oklahoma City
2,043 #12 Southern Okla Water Corp Ardmore
1,836 #13 Weleetka Public Works Authority Weleetka
1,812 #14 4T Investors LLC Liberal
1,737 #15 Otoe-Missouria Tribe Red Rock
1,707 Counties in Oklahoma
Oklahoma
121 systems · 889,384 served
· 20,669 violations
Tulsa
15 systems · 666,353 served
· 1,073 violations
Cleveland
73 systems · 216,341 served
· 8,560 violations
Comanche
25 systems · 137,288 served
· 5,160 violations
Payne
22 systems · 87,559 served
· 2,865 violations
Rogers
15 systems · 75,204 served
· 2,062 violations
Canadian
18 systems · 71,324 served
· 3,380 violations
Muskogee
20 systems · 71,012 served
· 7,166 violations
Creek
35 systems · 67,671 served
· 9,374 violations
Garfield
22 systems · 62,290 served
· 3,615 violations
Wagoner
13 systems · 60,271 served
· 4,331 violations
Pittsburg
22 systems · 50,811 served
· 9,873 violations
Pottawatomie
27 systems · 49,766 served
· 18,870 violations
Carter
8 systems · 47,657 served
· 3,630 violations
Le Flore
21 systems · 47,285 served
· 5,202 violations
Washington
11 systems · 45,692 served
· 1,820 violations
Okmulgee
15 systems · 45,674 served
· 7,090 violations
Kay
14 systems · 45,560 served
· 1,384 violations
Mayes
23 systems · 44,551 served
· 5,289 violations
Sequoyah
15 systems · 40,394 served
· 1,738 violations
Bryan
13 systems · 39,612 served
· 3,370 violations
Stephens
10 systems · 38,695 served
· 2,002 violations
Pontotoc
11 systems · 36,830 served
· 615 violations
Cherokee
37 systems · 35,853 served
· 9,781 violations
Grady
31 systems · 34,818 served
· 16,093 violations
Osage
30 systems · 33,607 served
· 16,200 violations
McCurtain
16 systems · 29,914 served
· 3,203 violations
Jackson
11 systems · 29,205 served
· 2,827 violations
Logan
31 systems · 27,600 served
· 7,336 violations
Delaware
37 systems · 25,428 served
· 8,936 violations
Showing top 30 of 77 counties.
Drinking Water Guides
Frequently Asked Questions
How many water systems are in Oklahoma? ▼
Oklahoma has 1,262 public water systems serving approximately 3,699,452 people. These include community water systems, non-transient non-community systems, and transient non-community systems regulated under the Safe Drinking Water Act.
How many drinking water violations are in Oklahoma? ▼
Oklahoma has 336,706 total drinking water violations on record, with 113,804 classified as health-based violations. 98.2% of water systems in the state have at least one violation.
Has PFAS been found in Oklahoma drinking water? ▼
Of 166 water systems tested for PFAS in Oklahoma, 101 had PFAS detected, a 60.8% detection rate. PFAS are persistent "forever chemicals" that do not break down in the environment.
What is the violation rate for Oklahoma water systems? ▼
Oklahoma's violation rate is 98.2%. This measures the percentage of public water systems that have at least one recorded violation in the EPA SDWIS database, including both health-based and monitoring/reporting violations.
Where does this Oklahoma water data come from? ▼
All drinking water data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS is the federal database that tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources & Methodology
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.