Oklahoma County Water Quality: 4 Cities Ranked by the Records
Oklahoma County, Oklahoma: 4 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
LithiumDetected in 4 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest67.8 µg/L
- OKLAHOMA CITY67.8 µg/LSample date: 2024-01-08 to 2024-10-07
- BETHANY52 µg/LSample date: 2024-04-01 to 2025-01-06
- EDMOND PWA20.7 µg/LSample date: 2024-04-06 to 2025-01-07
- CHOCTAW UA18.1 µg/LSample date: 2024-04-17 to 2024-10-22
Perfluorooctanesulfonic acid (PFOS)Detected in 2 systems of 4 tested4.0 ng/L federal MCL (2024) · US EPAHighest6.4 ng/L
- EDMOND PWA6.4 ng/LSample date: 2024-04-15 to 2025-01-07
- BETHANY5.2 ng/LSample date: 2024-04-01 to 2025-01-06
- CHOCTAW UANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-04-17 to 2024-10-22
- OKLAHOMA CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-10-07
Perfluorooctanoic acid (PFOA)Detected in 1 system of 4 tested4.0 ng/L federal MCL (2024) · US EPAHighest5.3 ng/L
- BETHANY5.3 ng/LSample date: 2024-04-01 to 2025-01-06
- CHOCTAW UANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-04-17 to 2024-10-22
- EDMOND PWANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-04-15 to 2025-01-07
- OKLAHOMA CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-10-07
Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems of 4 tested10 ng/L federal MCL (2024) · US EPAHighest9 ng/L
- BETHANY9 ng/LSample date: 2024-04-01 to 2025-01-06
- EDMOND PWA4.5 ng/LSample date: 2024-04-15 to 2025-01-07
- CHOCTAW UANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-17 to 2024-10-22
- OKLAHOMA CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-10-07
Lead (90th percentile)Detected in 1 system of 4 tested15 µg/L federal action level · US EPAHighest11.4 µg/L
- CHOCTAW UA11.4 µg/LMonitoring period: 2023–2025
- BETHANYNot detectedMonitoring period: 2021–2023
- EDMOND PWANot detectedMonitoring period: 2026–2026 (still open)
- OKLAHOMA CITYNot detectedMonitoring period: 2025–2025
Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems of 4 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest4.7 ng/L
- EDMOND PWA4.7 ng/LSample date: 2024-04-15 to 2025-01-07
- BETHANY3.3 ng/LSample date: 2024-04-01 to 2025-01-06
- CHOCTAW UANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-17 to 2024-10-22
- OKLAHOMA CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-10-07
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 4 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest6.8 ng/L
- EDMOND PWA6.8 ng/LSample date: 2024-04-15 to 2025-01-07
- BETHANYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-01 to 2025-01-06
- CHOCTAW UANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-17 to 2024-10-22
- OKLAHOMA CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-10-07
Perfluorobutanoic acid (PFBA)Detected in 1 system of 4 testedNo federal or state limit; shown for transparencyHighest6 ng/L
- EDMOND PWA6 ng/LSample date: 2024-04-15 to 2025-01-07
- BETHANYNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-04-01 to 2025-01-06
- CHOCTAW UANot detected · below 5.0 ng/L lab reporting limitSample date: 2024-04-17 to 2024-10-22
- OKLAHOMA CITYNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-10-07
1 more contaminant detectedShow
Perfluoropentanoic acid (PFPeA)Detected in 2 systems of 4 testedNo federal or state limit; shown for transparencyHighest4.7 ng/L
- OKLAHOMA CITY4.7 ng/LSample date: 2024-01-08 to 2024-10-07
- EDMOND PWA4.6 ng/LSample date: 2024-04-15 to 2025-01-07
- BETHANYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-01 to 2025-01-06
- CHOCTAW UANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-17 to 2024-10-22
22 PFAS tested, none detected in any systemShow
Tested in these 4 systems: BETHANY, CHOCTAW UA, EDMOND PWA, OKLAHOMA CITY
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorononanoic acid (PFNA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 4 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in OklahomaLargest water systems
- Oklahoma CityOKLAHOMA CITY · OK1020902644,000 served
- EdmondEDMOND PWA · OK102072379,408 served
- BethanyBETHANY · OK200551920,307 served
- ChoctawCHOCTAW UA · OK20055103,926 served
Frequently asked
How does Oklahoma County tap water compare across cities?
PurityMap ranks 4 cities in Oklahoma County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Oklahoma City's main water system: OKLAHOMA CITY · PWSID OK1020902 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Oklahoma County cities had a PFAS sample above a 2024 EPA limit?
2 of 4 Oklahoma County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Edmond (PFOS 6.4 ng/L), Bethany (PFOA 5.3 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 3.
Is there lead in Oklahoma County tap water?
Utilities report lead as a 90th-percentile result from home taps. 1 of 4 Oklahoma County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Have Oklahoma County water systems had drinking-water violations?
1 city in Oklahoma County has a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.
Follow Oklahoma County's water
Get an email when a city record in the county changes. Or go straight to the filters certified for what was found here.
Record changes only
We email when places in Oklahoma County get new results. Unsubscribe any time.
Follow Oklahoma County's water →