What was found in El Reno's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 480 µg/L 4.8% of the EPA limit 10000 µg/L Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 2824.5 µg/L — CANADIAN CO RWD # 4 · 907 people · 2019 | 2/4 | SYR4 |
| Copper | 302 µg/L 23% of the EPA limit 1300 µg/L Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 472.65 µg/L — CANADIAN CO RWS & SWMD #5 · 316 people · 2017 | 4/4 | SYR4 |
| Fluoride | 415 µg/L 10% of the EPA limit 4000 µg/L Main supplier: EL RENO · 16,212 people · 2019 | 2/4 | SYR4 |
| Barium | 19.8 µg/L 1% of the EPA limit 2000 µg/L Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 254.1 µg/L — CANADIAN CO RWD # 4 · 907 people · 2018 | 2/4 | SYR4 |
| Lithium | 132 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2025 | 1/4 | UCMR-5 |
| TTHM | 91.39 µg/L 114% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 93.81 µg/L — CANADIAN CO RWS & SWMD #5 · 316 people · 2019 | 4/4 | SYR4 |
| Chloroform | 48.05 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 54 µg/L — CANADIAN CO WATER AUTHORITY · 1,700 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 41.24 µg/L 69% of the EPA limit 60 µg/L Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 47.2 µg/L — CANADIAN CO WATER AUTHORITY · 1,700 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 34.75 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 34.855 µg/L — CANADIAN CO RWS & SWMD #5 · 316 people · 2019 | 4/4 | SYR4 |
| Bromoform | 28.32 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 32.535 µg/L — CANADIAN CO RWS & SWMD #5 · 316 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 23.14 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 26.21 µg/L — CANADIAN CO WATER AUTHORITY · 1,700 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 21.6 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 22.765 µg/L — CANADIAN CO RWS & SWMD #5 · 316 people · 2019 | 4/4 | SYR4 |
| Lead | 21.625 µg/L 144% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: EL RENO · 16,212 people · 2019 | 2/4 | SYR4 |
| Trichloroacetic Acid | 14.9 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 18.68 µg/L — CANADIAN CO WATER AUTHORITY · 1,700 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 13.315 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 15.415 µg/L — CANADIAN CO RWS & SWMD #5 · 316 people · 2019 | 4/4 | SYR4 |
| Combined Uranium | 1.297 µg/L 4.3% of the EPA limit 30 µg/L Main supplier: EL RENO · 16,212 people · 2016
Highest in the city: 9.86 µg/L — CANADIAN CO RWD # 4 · 907 people · 2019 | 2/4 | SYR4 |
| Arsenic | 2.172 µg/L 22% of the EPA limit 10 µg/L Main supplier: EL RENO · 16,212 people · 2018
Highest in the city: 7.13 µg/L — CANADIAN CO RWD # 4 · 907 people · 2015 | 2/4 | SYR4 |
| Gross Beta Particle Activity | 6.42 pCi/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2016 | 2/4 | SYR4 |
| Monochloroacetic Acid | 3.93 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019
Highest in the city: 6.15 µg/L — CANADIAN CO RWS & SWMD #5 · 316 people · 2019 | 3/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.48 pCi/L 30% of the EPA limit 15 pCi/L Highest in the city: CANADIAN CO RWD # 4 · 907 people · 2019 | 1/4 | SYR4 |
| Dalapon | 3.94 µg/L 2% of the EPA limit 200 µg/L Main supplier: EL RENO · 16,212 people · 2019 | 1/4 | SYR4 |
| Monobromoacetic Acid | 2 µg/L No EPA limit set Main supplier: EL RENO · 16,212 people · 2019 | 4/4 | SYR4 |
| Combined Radium (-226 And -228) | 1 pCi/L 20% of the EPA limit 5 pCi/L Highest in the city: CANADIAN CO RWD # 4 · 907 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: EL RENO · 16,212 people · 2025
Highest in the city: 0.0032 mg/L — CANADIAN CO RWS & SWMD #5 · 316 people · 2023 | 4/4 | LCR |
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 the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving El Reno
| Supplier | Population served |
|---|---|
| EL RENO | 16,212 |
| CANADIAN CO WATER AUTHORITY | 1,700 |
| CANADIAN CO RWD # 4 | 907 |
| CANADIAN CO RWS & SWMD #5 | 316 |
Frequently asked questions about El Reno tap water
Is El Reno tap water safe to drink?
EPA testing detected 24 contaminants in the water serving El Reno. 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 El Reno?
4 public water suppliers report drinking-water monitoring for El Reno, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in El Reno's water?
The contaminants EPA monitoring detected in El Reno include Nitrate-Nitrite, Copper, Fluoride, Barium, Lithium. The full list, with the level at the main supplier 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.