What was found in Blackwell'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 | 840 µg/L 8.4% of the EPA limit 10000 µg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 1/3 | SYR4 |
| TTHM | 158.2 µg/L 198% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019
Highest in the city: 193.5 µg/L — KAY COUNTY RURAL WATER DISTRICT 7 · 920 people · 2019 | 2/3 | SYR4 |
| Copper | 87 µg/L 6.7% of the EPA limit 1300 µg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2018
Highest in the city: 178.8 µg/L — KAY COUNTY RURAL WATER DISTRICT 7 · 920 people · 2017 | 2/3 | SYR4 |
| Dibromochloromethane | 58.865 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019
Highest in the city: 75.095 µg/L — KAY COUNTY RURAL WATER DISTRICT 7 · 920 people · 2019 | 2/3 | SYR4 |
| Bromoform | 49.64 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019
Highest in the city: 53.58 µg/L — KAY COUNTY RURAL WATER DISTRICT 7 · 920 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 40.255 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019
Highest in the city: 52.16 µg/L — KAY COUNTY RURAL WATER DISTRICT 7 · 920 people · 2019 | 2/3 | SYR4 |
| Chloroform | 28.54 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019
Highest in the city: 50.15 µg/L — KAY COUNTY RURAL WATER DISTRICT 7 · 920 people · 2019 | 2/3 | SYR4 |
| Lead | 50.01 µg/L 333% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2018 | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 26.905 µg/L 45% of the EPA limit 60 µg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 2/3 | SYR4 |
| Barium | 24.8 µg/L 1.2% of the EPA limit 2000 µg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2013 | 1/3 | SYR4 |
| Lithium | 21 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2023 | 1/3 | UCMR-5 |
| Dibromoacetic Acid | 13.2 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 2/3 | SYR4 |
| Dichloroacetic Acid | 10.075 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 5.342 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 4.4505 pCi/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 1/3 | SYR4 |
| Monochloroacetic Acid | 3.38 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 3.184 µg/L No EPA limit set Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 1.5985 µg/L 5.3% of the EPA limit 30 µg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 1/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.091 pCi/L 7.3% of the EPA limit 15 pCi/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 1/3 | SYR4 |
| Atrazine | 0.5730 µg/L 19% of the EPA limit 3 µg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.3956 pCi/L 7.9% of the EPA limit 5 pCi/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: BLACKWELL MUNICIPAL AUTHORITY · 7,668 people · 2024 | 3/3 | 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 Blackwell
| Supplier | Population served |
|---|---|
| BLACKWELL MUNICIPAL AUTHORITY | 7,668 |
| KAY COUNTY RURAL WATER DISTRICT 7 | 920 |
| KAY ELECTRIC COOPERATIVE | 2 |
Frequently asked questions about Blackwell tap water
Is Blackwell tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Blackwell. 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 Blackwell?
3 public water suppliers report drinking-water monitoring for Blackwell, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Blackwell's water?
The contaminants EPA monitoring detected in Blackwell include Nitrate-Nitrite, TTHM, Copper, Dibromochloromethane, Bromoform. 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.