What was found in Oklahoma City's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Copper | 2790 µg/L 215% of the EPA limit, in the worst sample — 1300 µg/L | 6/6 | SYR4 |
| Nitrate | 2420 µg/L 24% of the EPA limit 10000 µg/L | 5/6 | SYR4 |
| Nitrate-Nitrite | 2420 µg/L 24% of the EPA limit 10000 µg/L | 6/6 | SYR4 |
| Fluoride | 950 µg/L 24% of the EPA limit 4000 µg/L | 4/6 | SYR4 |
| Barium | 640 µg/L 32% of the EPA limit 2000 µg/L | 6/6 | SYR4 |
| Nitrite | 340 µg/L 34% of the EPA limit 1000 µg/L | 3/6 | SYR4 |
| TTHM | 85.86 µg/L 107% of the EPA limit, in the worst sample — 80 µg/L | 4/6 | SYR4 |
| Chloroform | 69.82 µg/L No EPA limit set | 4/6 | SYR4 |
| Lithium | 67.8 µg/L No EPA limit set | 2/6 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 63.9 µg/L 107% of the EPA limit, in the worst sample — 60 µg/L | 3/6 | SYR4 |
| Combined Uranium | 51.8 µg/L 173% of the EPA limit, in the worst sample — 30 µg/L | 4/6 | SYR4 |
| Lead | 43.5 µg/L 290% of the EPA limit, in the worst sample — 15 µg/L | 3/6 | SYR4 |
| Bromate | 40.5 µg/L 405% of the EPA limit, in the worst sample — 10 µg/L | 1/6 | SYR4 |
| Dichloroacetic Acid | 40.4 µg/L No EPA limit set | 3/6 | SYR4 |
| Dibromochloromethane | 26.21 µg/L No EPA limit set | 5/6 | SYR4 |
| Bromodichloromethane | 26.1 µg/L No EPA limit set | 3/6 | SYR4 |
| Chromium | 26 µg/L 26% of the EPA limit 100 µg/L | 1/6 | SYR4 |
| Trichloroacetic Acid | 23.9 µg/L No EPA limit set | 2/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 20.2 pCi/L 135% of the EPA limit, in the worst sample — 15 pCi/L | 4/6 | SYR4 |
| Gross Beta Particle Activity | 15.1 pCi/L No EPA limit set | 5/6 | SYR4 |
| Arsenic | 15 µg/L 150% of the EPA limit, in the worst sample — 10 µg/L | 2/6 | SYR4 |
| Bromoform | 9.81 µg/L No EPA limit set | 5/6 | SYR4 |
| Dibromoacetic Acid | 8.4 µg/L No EPA limit set | 2/6 | SYR4 |
| Monobromoacetic Acid | 6.58 µg/L No EPA limit set | 1/6 | SYR4 |
| Carbon Tetrachloride | 6.4 µg/L 128% of the EPA limit, in the worst sample — 5 µg/L | 1/6 | SYR4 |
| Monochloroacetic Acid | 4.86 µg/L No EPA limit set | 1/6 | SYR4 |
| Combined Radium (-226 And -228) | 4.03 pCi/L 81% of the EPA limit 5 pCi/L | 4/6 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.59 µg/L 43% of the EPA limit 6 µg/L | 2/6 | SYR4 |
| Toluene | 1 µg/L 0.1% of the EPA limit 1000 µg/L | 2/6 | SYR4 |
| Trichloroethylene | 0.9000 µg/L 18% of the EPA limit 5 µg/L | 1/6 | SYR4 |
| Lead | 0.0435 mg/L 290% above the EPA limit of 0.0150 mg/L | 6/6 | LCR |
| PFHXS | 0.0052 µg/L No EPA limit set | 1/6 | UCMR-5 |
| Pfpea | 0.0047 µg/L No EPA limit set | 1/6 | UCMR-5 |
Water suppliers serving Oklahoma City
| Supplier | Population served |
|---|---|
| OKLAHOMA CITY | 644,000 |
| TINKER AIR FORCE BASE | 24,645 |
| HILLCREST MHP | 400 |
| ABES RV PARK | 175 |
| HILLTOP MHP | 125 |
| HOLLIDAY OUTT MHP | 100 |
Frequently asked questions about Oklahoma City tap water
Is Oklahoma City tap water safe to drink?
EPA testing detected 33 contaminants in the water serving Oklahoma City. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Oklahoma City?
6 public water suppliers report drinking-water monitoring for Oklahoma City, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Oklahoma City's water?
The contaminants EPA monitoring detected in Oklahoma City include Copper, Nitrate, Nitrate-Nitrite, Fluoride, Barium. The full list, with the highest level found and the data source, is in the table above.
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.