What was found in Marlow'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 | 1500 µg/L 15% of the EPA limit 10000 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019
Highest in the city: 1985 µg/L — MARLOW MUNICIPAL AUTHORITY · 4,600 people · 2019 | 2/2 | SYR4 |
| Fluoride | 403 µg/L 10% of the EPA limit 4000 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019
Highest in the city: 442.5 µg/L — MARLOW MUNICIPAL AUTHORITY · 4,600 people · 2018 | 2/2 | SYR4 |
| Barium | 352.25 µg/L 18% of the EPA limit 2000 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Copper | 219.19999999999993 µg/L 17% of the EPA limit 1300 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| TTHM | 184.22999999999985 µg/L 230% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 70.525 µg/L 118% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Chloroform | 66.175 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 64.74499999999996 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Lithium | 53 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2024 | 2/2 | UCMR-5 |
| Dibromochloromethane | 50.46499999999997 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 36.22999999999999 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 16.739999999999995 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 15.53 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Bromoform | 11.339999999999996 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 9.989999999999998 pCi/L 67% of the EPA limit 15 pCi/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019
Highest in the city: 10.899999999999999 pCi/L — MARLOW MUNICIPAL AUTHORITY · 4,600 people · 2018 | 2/2 | SYR4 |
| Lead | 10.440999999999999 µg/L 70% of the EPA limit 15 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 7.9799999999999995 µg/L 27% of the EPA limit 30 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 5.4943 pCi/L No EPA limit set Highest in the city: MARLOW MUNICIPAL AUTHORITY · 4,600 people · 2018 | 1/2 | SYR4 |
| Monochloroacetic Acid | 4.140000000000001 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Arsenic | 3.09 µg/L 31% of the EPA limit 10 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 2/2 | SYR4 |
| Chromium | 3 µg/L 3% of the EPA limit 100 µg/L Highest in the city: MARLOW MUNICIPAL AUTHORITY · 4,600 people · 2018 | 1/2 | SYR4 |
| Monobromoacetic Acid | 2.945 µg/L No EPA limit set Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 1/2 | SYR4 |
| Diquat | 1.6 µg/L 8% of the EPA limit 20 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.1448999999999998 pCi/L 23% of the EPA limit 5 pCi/L Highest in the city: MARLOW MUNICIPAL AUTHORITY · 4,600 people · 2018 | 1/2 | SYR4 |
| Selenium | 1.117 µg/L 2.2% of the EPA limit 50 µg/L Highest in the city: MARLOW MUNICIPAL AUTHORITY · 4,600 people · 2018 | 1/2 | SYR4 |
| Picloram | 0.7030 µg/L 0.1% of the EPA limit 500 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 1/2 | SYR4 |
| 2,4-D | 0.3700 µg/L 0.5% of the EPA limit 70 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 1/2 | SYR4 |
| Pentachlorophenol | 0.2100 µg/L 21% of the EPA limit 1 µg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: STEPHENS CO RWD #5 · 6,426 people · 2025
Highest in the city: 0.0022 mg/L — MARLOW MUNICIPAL AUTHORITY · 4,600 people · 2024 | 2/2 | 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 Marlow
| Supplier | Population served |
|---|---|
| STEPHENS CO RWD #5 | 6,426 |
| MARLOW MUNICIPAL AUTHORITY | 4,600 |
Frequently asked questions about Marlow tap water
Is Marlow tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Marlow. 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 Marlow?
2 public water suppliers report drinking-water monitoring for Marlow, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Marlow's water?
The contaminants EPA monitoring detected in Marlow include Nitrate-Nitrite, Fluoride, Barium, Copper, TTHM. 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.