What was found in Stillwater'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 | 1111 µg/L 11% of the EPA limit 10000 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 10490 µg/L — PAYNE CO RWD #3 · 1,400 people · 2018 | 3/5 | SYR4 |
| Nitrate-Nitrite | 1204 µg/L 12% of the EPA limit 10000 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 6200 µg/L — PAYNE CO RWD #3 · 1,400 people · 2019 | 3/5 | SYR4 |
| Fluoride | 928 µg/L 23% of the EPA limit 4000 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019 | 3/5 | SYR4 |
| Barium | 51.85 µg/L 2.6% of the EPA limit 2000 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2015
Highest in the city: 223 µg/L — PAYNE CO RWD #3 · 1,400 people · 2014 | 3/5 | SYR4 |
| Copper | 117 µg/L 9% of the EPA limit 1300 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2018 | 5/5 | SYR4 |
| TTHM | 31.275 µg/L 39% of the EPA limit 80 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 93.34 µg/L — PAYNE CO RW CORP #3 · 3,000 people · 2019 | 4/5 | SYR4 |
| Lead | 21.4 µg/L 143% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2018
Highest in the city: 41.3 µg/L — 51 EAST WATER · 2,500 people · 2018 | 4/5 | SYR4 |
| Bromodichloromethane | 11.6 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 34.19 µg/L — PAYNE CO RW CORP #3 · 3,000 people · 2019 | 4/5 | SYR4 |
| Combined Uranium | 33.24 µg/L 111% of the EPA limit, at the 95th percentile of samples — 30 µg/L Highest in the city: RED WAGON MHP · 46 people · 2019 | 2/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 31.9 µg/L 53% of the EPA limit 60 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019 | 4/5 | SYR4 |
| Chloroform | 16.9 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 27.2 µg/L — PAYNE CO RW CORP #3 · 3,000 people · 2019 | 4/5 | SYR4 |
| Dibromochloromethane | 6.9195 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 27.19 µg/L — PAYNE CO RW CORP #3 · 3,000 people · 2019 | 4/5 | SYR4 |
| Chromium | 25 µg/L 25% of the EPA limit 100 µg/L Highest in the city: PAYNE CO RWD #3 · 1,400 people · 2014 | 1/5 | SYR4 |
| Dichloroacetic Acid | 22.2 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019 | 3/5 | SYR4 |
| Lithium | 21.6 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2024 | 1/5 | UCMR-5 |
| Bromoform | 4.0075 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 18.155 µg/L — PAYNE CO RW CORP #3 · 3,000 people · 2019 | 4/5 | SYR4 |
| Cyanide | 15 µg/L 7.5% of the EPA limit 200 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2012 | 1/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.05 pCi/L 7% of the EPA limit 15 pCi/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2014
Highest in the city: 14.55 pCi/L — RED WAGON MHP · 46 people · 2019 | 3/5 | SYR4 |
| Gross Beta Particle Activity | 5 pCi/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2014
Highest in the city: 13.565 pCi/L — RED WAGON MHP · 46 people · 2019 | 3/5 | SYR4 |
| Bromate | 9.146 µg/L 91% of the EPA limit 10 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019 | 1/5 | SYR4 |
| Selenium | 8 µg/L 16% of the EPA limit 50 µg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2015 | 1/5 | SYR4 |
| Trichloroacetic Acid | 6.2875 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 6.52 µg/L — PAYNE CO RW CORP #3 · 3,000 people · 2019 | 3/5 | SYR4 |
| Monochloroacetic Acid | 6.236 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019 | 1/5 | SYR4 |
| Dibromoacetic Acid | 4.535 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 6.125 µg/L — PAYNE CO RW CORP #3 · 3,000 people · 2019 | 4/5 | SYR4 |
| Arsenic | 6 µg/L 60% of the EPA limit 10 µg/L Highest in the city: RED WAGON MHP · 46 people · 2019 | 1/5 | SYR4 |
| Monobromoacetic Acid | 2.048 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2019
Highest in the city: 2.74 µg/L — PAYNE CO RW CORP #3 · 3,000 people · 2019 | 3/5 | SYR4 |
| Combined Radium (-226 And -228) | 0.1580 pCi/L 3.2% of the EPA limit 5 pCi/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2014
Highest in the city: 2.5435 pCi/L — RED WAGON MHP · 46 people · 2019 | 3/5 | SYR4 |
| PFOS | 0.0086 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2024 | 1/5 | UCMR-5 |
| PFHXS | 0.0064 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2024 | 1/5 | UCMR-5 |
| Pfhxa | 0.0049 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2024 | 1/5 | UCMR-5 |
| Pfpea | 0.0044 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2024 | 1/5 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2025
Highest in the city: 0.0032 mg/L — 51 EAST WATER · 2,500 people · 2021 | 5/5 | LCR |
| PFBS | 0.0030 µg/L No EPA limit set Main supplier: STILLWATER UTILITIES AUTHORITY · 53,000 people · 2024 | 1/5 | UCMR-5 |
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 Stillwater
| Supplier | Population served |
|---|---|
| STILLWATER UTILITIES AUTHORITY | 53,000 |
| PAYNE CO RW CORP #3 | 3,000 |
| 51 EAST WATER | 2,500 |
| PAYNE CO RWD #3 | 1,400 |
| RED WAGON MHP | 46 |
Frequently asked questions about Stillwater tap water
Is Stillwater tap water safe to drink?
EPA testing detected 33 contaminants in the water serving Stillwater. 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 Stillwater?
5 public water suppliers report drinking-water monitoring for Stillwater, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Stillwater's water?
The contaminants EPA monitoring detected in Stillwater include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper. 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.