What was found in Cookson'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 |
|---|---|---|---|
| Copper | 74.1 µg/L 5.7% of the EPA limit 1300 µg/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2018
Highest in the city: 3650 µg/L — CHEROKEE CO. RWD # 16 (WOODHAVEN) · 200 people · 2019 | 5/5 | SYR4 |
| Nitrate-Nitrite | 1100 µg/L 11% of the EPA limit 10000 µg/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019
Highest in the city: 2920 µg/L — CHEROKEE CO. RWD # 16 (WILDCAT) · 200 people · 2019 | 5/5 | SYR4 |
| Fluoride | 120 µg/L 3% of the EPA limit 4000 µg/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2013 | 1/5 | SYR4 |
| TTHM | 119.6 µg/L 150% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019 | 5/5 | SYR4 |
| Chloroform | 106.05 µg/L No EPA limit set Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019 | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 68.88 µg/L 115% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019 | 5/5 | SYR4 |
| Trichloroacetic Acid | 61.11 µg/L No EPA limit set Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019 | 5/5 | SYR4 |
| Lead | 44.6 µg/L 297% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the city: CHEROKEE CO. RWD # 16 (WOODHAVEN) · 200 people · 2019 | 3/5 | SYR4 |
| Dichloroacetic Acid | 28.08 µg/L No EPA limit set Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019
Highest in the city: 38.78 µg/L — CHEROKEE CO. RWD # 16 (WOODHAVEN) · 200 people · 2019 | 5/5 | SYR4 |
| Barium | 32 µg/L 1.6% of the EPA limit 2000 µg/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2013
Highest in the city: 35 µg/L — CHEROKEE CO. RWD # 16 (LAKEWOOD) · 200 people · 2013 | 5/5 | SYR4 |
| Bromodichloromethane | 18.205 µg/L No EPA limit set Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019 | 5/5 | SYR4 |
| Selenium | 8.8 µg/L 18% of the EPA limit 50 µg/L Highest in the city: CHEROKEE CO. RWD # 16 (WOODHAVEN) · 200 people · 2013 | 2/5 | SYR4 |
| Monochloroacetic Acid | 3.473 µg/L No EPA limit set Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019
Highest in the city: 5.7495 µg/L — CHEROKEE CO. RWD # 16 (CHICKEN CREEK) · 272 people · 2019 | 4/5 | SYR4 |
| Dibromochloromethane | 5.046 µg/L No EPA limit set Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019 | 5/5 | SYR4 |
| Gross Beta Particle Activity | 3.1835 pCi/L No EPA limit set Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2015
Highest in the city: 3.52 pCi/L — CHEROKEE CO. RWD # 16 (LAKEWOOD) · 200 people · 2014 | 5/5 | SYR4 |
| Dibromoacetic Acid | 1.0975 µg/L No EPA limit set Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2019
Highest in the city: 3.172 µg/L — CHEROKEE CO. RWD # 16 (WOODHAVEN) · 200 people · 2019 | 5/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.7600 pCi/L 5.1% of the EPA limit 15 pCi/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2015
Highest in the city: 2.07 pCi/L — CHEROKEE CO. RWD # 16 (LAKEWOOD) · 200 people · 2014 | 5/5 | SYR4 |
| Combined Radium (-226 And -228) | 0.4815 pCi/L 9.6% of the EPA limit 5 pCi/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2015
Highest in the city: 1.03 pCi/L — CHEROKEE CO. RWD # 16 (LAKEWOOD) · 200 people · 2014 | 4/5 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: CHEROKEE CO. RWD #13 · 1,640 people · 2024
Highest in the city: 0.0135 mg/L — CHEROKEE CO. RWD # 16 (WOODHAVEN) · 200 people · 2026 | 5/5 | 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 Cookson
| Supplier | Population served |
|---|---|
| CHEROKEE CO. RWD #13 | 1,640 |
| CHEROKEE CO. RWD # 16 (CHICKEN CREEK) | 272 |
| CHEROKEE CO. RWD # 16 (WILDCAT) | 200 |
| CHEROKEE CO. RWD # 16 (WOODHAVEN) | 200 |
| CHEROKEE CO. RWD # 16 (LAKEWOOD) | 200 |
Frequently asked questions about Cookson tap water
Is Cookson tap water safe to drink?
EPA testing detected 19 contaminants in the water serving Cookson. 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 Cookson?
5 public water suppliers report drinking-water monitoring for Cookson, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Cookson's water?
The contaminants EPA monitoring detected in Cookson include Copper, Nitrate-Nitrite, Fluoride, TTHM, Chloroform. 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.