Oklahoma
Water quality data from the EPA Safe Drinking Water Information System
Water Systems
5,688
Active public water systems
Population Served
3.72M
Residents with piped water
Lead Violations
29
Systems exceeding 15 ppb
Copper Violations
171
Lead & Copper Rule
Average Lead Level
EPA Action Level: 15 ppb
MCLG (health goal): 0 ppb
Average across 1556 systems with reported lead data.
Violations Detected
200 water systems in Oklahoma have reported violations under the Lead and Copper Rule. These utilities are required to notify customers and take corrective action.
Schools & Daycares
2 school or daycare water systems identified in this state.
Children are especially vulnerable to lead exposure. Schools are required to test for lead and remediate violations.
Water Systems: Highest Lead Levels
| System Name | City | Population | Lead Level | Status | Sample Date |
|---|---|---|---|---|---|
| ARDMORE | 24,893 | 19.20 ppb | Violation | 2025-12-31 | |
| SAND SPRINGS | 28,774 | 6.90 ppb | OK | 2024-12-31 | |
| SAPULPA | 19,702 | 5.90 ppb | OK | 2024-12-31 | |
| MUSKOGEE | 38,310 | 5.40 ppb | OK | 2025-12-31 | |
| ENID | 49,347 | 5.10 ppb | OK | 2024-12-31 | |
| CHICKASHA | 16,036 | 3.75 ppb | OK | 2024-12-31 | |
| BARTLESVILLE | 34,748 | 3.60 ppb | OK | 2024-12-31 | |
| MCALESTER | 18,206 | 3.60 ppb | OK | 2025-12-31 | |
| DURANT | 15,545 | 3.11 ppb | OK | 2025-12-31 | |
| CLAREMORE | 11,782 | 3.00 ppb | OK | 2025-12-31 | |
| ARDMORE | 11,250 | 2.94 ppb | OK | 2024-12-31 | |
| SHAWNEE | 29,990 | 2.80 ppb | OK | 2023-12-31 | |
| ELK CITY | 10,510 | 2.40 ppb | OK | 2023-12-31 | |
| STILLWATER | 53,000 | 2.10 ppb | OK | 2025-12-31 | |
| MIAMI | 13,704 | 2.10 ppb | OK | 2025-12-31 |
Showing top 15 of 1531 systems with lead data. Action level: 15 ppb.
Systems With Active Violations
These water systems have exceeded EPA limits and must take corrective action.
ENID · Pop. 49,347
Lead: 5.10 ppb (2024-12-31)
PONCA CITY · Pop. 27,155
Lead: 0.00 ppb (2025-12-31)
ARDMORE · Pop. 24,893
Lead: 19.20 ppb (2025-12-31)
CLAREMORE · Pop. 11,782
Lead: 3.00 ppb (2025-12-31)
Water Source Types
Air Quality
GoodAvg AQI
46.1
PM2.5
6.7 µg/m³
Unhealthy Days
7
Primary Pollutant
Ozone, Dust
Source: EPA AirNow & American Lung Association 2024 State of the Air. AQI scale: 0–50 Good · 51–100 Moderate · 101–150 Sensitive Groups · 151+ Unhealthy.
PFAS Contamination
Moderate DetectionPFAS (per- and polyfluoroalkyl substances), known as “forever chemicals,” are a group of synthetic chemicals that persist indefinitely in the environment and human body. The EPA set a maximum contaminant level (MCL) of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024. View national PFAS tracker →
Systems Tested
168
PFAS Detected
52
Detection Rate
31.0%
Exceeding MCL (4 ppt)
8(4.8%)
Highest recorded level: 20 ppt (EPA MCL: 4 ppt). Military installations; Tinker AFB contamination documented