Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
19
health-based violations
30
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| TT | Health-based | Resolved | 2012-01-01 → 2012-01-31 |
| TT | Health-based | Resolved | 2012-01-01 → 2012-01-31 |
| TT | Health-based | Resolved | 2012-01-01 → 2012-01-31 |
| TT | Health-based | Resolved | 2004-07-01 → 2004-09-30 |
| TT | Health-based | Resolved | 2004-07-01 → 2004-09-30 |
| TT | Health-based | Resolved | 2004-07-01 → 2004-09-30 |
| TT | Health-based | Resolved | 2004-07-01 → 2004-09-30 |
| TT | Health-based | Resolved | 2004-04-01 → 2004-06-30 |
| TT | Health-based | Resolved | 2004-04-01 → 2004-06-30 |
| TT | Health-based | Resolved | 2004-04-01 → 2004-06-30 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| Pfpea | 0.0047 µg/L | 3/8 | 2024 |
Other contaminants detected
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 76.688 µg/L 96% of the EPA limit 80 µg/L
worst single sample: 85.86 µg/L | 633/634 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 46.716 µg/L 78% of the EPA limit 60 µg/L
worst single sample: 63.9 µg/L | 633/634 | SYR4 | 2012–2019 |
| Bromodichloromethane | 17.3725 µg/L No EPA limit set
worst single sample: 26.1 µg/L | 536/537 | SYR4 | 2012–2019 |
| Chloroform | 57.322 µg/L No EPA limit set
worst single sample: 69.82 µg/L | 533/537 | SYR4 | 2012–2019 |
| Dibromochloromethane | 8.63 µg/L No EPA limit set
worst single sample: 26.21 µg/L | 527/537 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 26.352 µg/L No EPA limit set
worst single sample: 40.4 µg/L | 519/522 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 20.705 µg/L No EPA limit set
worst single sample: 23.9 µg/L | 440/522 | SYR4 | 2012–2019 |
| Nitrate | 439.75 µg/L 4.4% of the EPA limit 10000 µg/L
worst single sample: 687 µg/L | 422/456 | SYR4 | 2012–2019 |
| Copper | 260.926 µg/L 20% of the EPA limit 1300 µg/L
worst single sample: 741.95 µg/L | 284/322 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 442 µg/L 4.4% of the EPA limit 10000 µg/L
worst single sample: 691 µg/L | 201/218 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 4.2255 µg/L No EPA limit set
worst single sample: 8.4 µg/L | 200/522 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 4.499 µg/L No EPA limit set
worst single sample: 4.86 µg/L | 198/522 | SYR4 | 2012–2019 |
| Bromoform | 7.825 µg/L No EPA limit set
worst single sample: 9.81 µg/L | 106/537 | SYR4 | 2012–2019 |
| Nitrite | 58.15 µg/L 5.8% of the EPA limit 1000 µg/L
worst single sample: 71 µg/L | 48/218 | SYR4 | 2012–2019 |
| Lead | 13.313 µg/L 89% of the EPA limit 15 µg/L
worst single sample: 23.09 µg/L | 39/322 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 6.284 µg/L No EPA limit set
worst single sample: 6.58 µg/L | 25/522 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 20/20 | LCR | 2025 |
| Bromate | 34.14 µg/L 341% of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 40.5 µg/L | 9/100 | SYR4 | 2012–2019 |
| Lithium | 67.8 µg/L No EPA limit set | 5/8 | UCMR-5 | 2024 |
| Gross Beta Particle Activity | 8.4806 pCi/L No EPA limit set
worst single sample: 8.78 pCi/L | 4/5 | SYR4 | 2012–2018 |
| Barium | 56.23 µg/L 2.8% of the EPA limit 2000 µg/L
worst single sample: 56.7 µg/L | 3/3 | SYR4 | 2013 |
| Fluoride | 845 µg/L 21% of the EPA limit 4000 µg/L
worst single sample: 850 µg/L | 3/3 | SYR4 | 2013 |
| Di(2-ethylhexyl) Phthalate | 2.59 µg/L 43% of the EPA limit 6 µg/L | 1/12 | SYR4 | 2018–2019 |
88 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Oklahoma City
Is Oklahoma City tap water safe to drink?
EPA monitoring detected 24 contaminants in Oklahoma City's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Oklahoma City's water?
EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.
How many people does Oklahoma City serve?
Oklahoma City reports serving 644,000 people in Oklahoma, per its EPA record.
Has Oklahoma City had any water quality violations?
The EPA has 30 violations on file for Oklahoma City, of which 19 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.