What was found in Shawnee'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 | 1320 µg/L 13% of the EPA limit 10000 µg/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019 | 2/5 | SYR4 |
| Chlorite | 953.5 µg/L 95% of the EPA limit 1000 µg/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019 | 1/5 | SYR4 |
| Copper | 326.55 µg/L 25% of the EPA limit 1300 µg/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2017
Highest in the city: 767 µg/L — POTTAWATOMIE CO. RWD #3 (DALE PLANT) · 313 people · 2018 | 5/5 | SYR4 |
| Fluoride | 620 µg/L 16% of the EPA limit 4000 µg/L Highest in the city: STEELMAN ESTATES · 45 people · 2018 | 1/5 | SYR4 |
| Barium | 144 µg/L 7.2% of the EPA limit 2000 µg/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2012 | 3/5 | SYR4 |
| TTHM | 47.965 µg/L 60% of the EPA limit 80 µg/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 128.25 µg/L — POTTAWATOMIE CO DEVELOPMENT AUTH · 1,200 people · 2019 | 5/5 | SYR4 |
| Chloroform | 21.85 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 112.45 µg/L — POTTAWATOMIE COUNTY RWD #3 · 560 people · 2019 | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 37.4 µg/L 62% of the EPA limit 60 µg/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 83.48 µg/L — POTTAWATOMIE COUNTY RWD #3 · 560 people · 2019 | 5/5 | SYR4 |
| Dichloroacetic Acid | 25.705 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 43.7 µg/L — POTTAWATOMIE COUNTY RWD #3 · 560 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 17.215 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 34.67 µg/L — POTTAWATOMIE CO DEVELOPMENT AUTH · 1,200 people · 2019 | 4/5 | SYR4 |
| Trichloroacetic Acid | 8.71 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 32.72 µg/L — POTTAWATOMIE COUNTY RWD #3 · 560 people · 2019 | 5/5 | SYR4 |
| Lead | 24.02 µg/L 160% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2017 | 2/5 | SYR4 |
| Dibromochloromethane | 14.2 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 18.415 µg/L — POTTAWATOMIE CO. RWD #3 (DALE PLANT) · 313 people · 2019 | 4/5 | SYR4 |
| Bromoform | 7.8995 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 12.48 µg/L — POTTAWATOMIE CO. RWD #3 (DALE PLANT) · 313 people · 2019 | 4/5 | SYR4 |
| Dibromoacetic Acid | 6.67 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 10.7 µg/L — POTTAWATOMIE CO DEVELOPMENT AUTH · 1,200 people · 2019 | 4/5 | SYR4 |
| Monochloroacetic Acid | 5.404 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019 | 3/5 | SYR4 |
| Combined Uranium | 5.38 µg/L 18% of the EPA limit 30 µg/L Highest in the city: STEELMAN ESTATES · 45 people · 2017 | 1/5 | SYR4 |
| Gross Beta Particle Activity | 5.163 pCi/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2014 | 2/5 | SYR4 |
| Monobromoacetic Acid | 1.705 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2019
Highest in the city: 2.535 µg/L — POTTAWATOMIE CO DEVELOPMENT AUTH · 1,200 people · 2019 | 4/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.66 pCi/L 11% of the EPA limit 15 pCi/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2014 | 2/5 | SYR4 |
| Combined Radium (-226 And -228) | 0.3200 pCi/L 6.4% of the EPA limit 5 pCi/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2014 | 1/5 | SYR4 |
| Pfba | 0.0079 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2024 | 1/5 | UCMR-5 |
| Pfpea | 0.0032 µg/L No EPA limit set Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2024 | 1/5 | UCMR-5 |
| Lead | 0.0028 mg/L 19% of the EPA limit 0.0150 mg/L Main supplier: SHAWNEE MUNICIPAL AUTHORITY · 29,990 people · 2023 | 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 Shawnee
| Supplier | Population served |
|---|---|
| SHAWNEE MUNICIPAL AUTHORITY | 29,990 |
| POTTAWATOMIE CO DEVELOPMENT AUTH | 1,200 |
| POTTAWATOMIE COUNTY RWD #3 | 560 |
| POTTAWATOMIE CO. RWD #3 (DALE PLANT) | 313 |
| STEELMAN ESTATES | 45 |
Frequently asked questions about Shawnee tap water
Is Shawnee tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Shawnee. 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 Shawnee?
5 public water suppliers report drinking-water monitoring for Shawnee, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Shawnee's water?
The contaminants EPA monitoring detected in Shawnee include Nitrate-Nitrite, Chlorite, Copper, Fluoride, Barium. 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.