What was found in Guthrie'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 | 1130 µg/L 11% of the EPA limit 10000 µg/L Main supplier: GUTHRIE · 9,925 people · 2019
Highest in the city: 1200 µg/L — LOGAN CO RWD #1 · 8,907 people · 2019 | 2/3 | SYR4 |
| Chlorite | 896.25 µg/L 90% of the EPA limit 1000 µg/L Main supplier: GUTHRIE · 9,925 people · 2019 | 1/3 | SYR4 |
| Barium | 153 µg/L 7.7% of the EPA limit 2000 µg/L Main supplier: GUTHRIE · 9,925 people · 2016
Highest in the city: 592.8 µg/L — LOGAN CO RWD #1 · 8,907 people · 2019 | 2/3 | SYR4 |
| Copper | 591.75 µg/L 46% of the EPA limit 1300 µg/L Main supplier: GUTHRIE · 9,925 people · 2019 | 2/3 | SYR4 |
| Fluoride | 583 µg/L 15% of the EPA limit 4000 µg/L Main supplier: GUTHRIE · 9,925 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 175.725 µg/L 586% of the EPA limit, at the 95th percentile of samples — 30 µg/L Highest in the city: LOGAN CO RWD #1 · 8,907 people · 2019 | 1/3 | SYR4 |
| Lead | 106.25 µg/L 708% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: GUTHRIE · 9,925 people · 2019 | 2/3 | SYR4 |
| TTHM | 69.02 µg/L 86% of the EPA limit 80 µg/L Main supplier: GUTHRIE · 9,925 people · 2019 | 2/3 | SYR4 |
| Dibromochloromethane | 24.1 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 3.9365 pCi/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019
Highest in the city: 23.76 pCi/L — LOGAN CO RWD #1 · 8,907 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20.44 µg/L 34% of the EPA limit 60 µg/L Main supplier: GUTHRIE · 9,925 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 20.125 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 2/3 | SYR4 |
| Arsenic | 19.82 µg/L 198% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: LOGAN CO RWD #1 · 8,907 people · 2019 | 1/3 | SYR4 |
| Bromoform | 18.785 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 1/3 | SYR4 |
| Lithium | 12 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2025
Highest in the city: 17.1 µg/L — LOGAN CO RWD #1 · 8,907 people · 2024 | 2/3 | UCMR-5 |
| Chloroform | 10.8 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 1/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.9030 pCi/L 6% of the EPA limit 15 pCi/L Main supplier: GUTHRIE · 9,925 people · 2019
Highest in the city: 10.765 pCi/L — LOGAN CO RWD #1 · 8,907 people · 2019 | 2/3 | SYR4 |
| Dichloroacetic Acid | 10.042 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 7.8775 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 1/3 | SYR4 |
| Monochloroacetic Acid | 6.15 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 3.97 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.5700 pCi/L 11% of the EPA limit 5 pCi/L Main supplier: GUTHRIE · 9,925 people · 2019
Highest in the city: 2.31 pCi/L — LOGAN CO RWD #1 · 8,907 people · 2019 | 2/3 | SYR4 |
| Monobromoacetic Acid | 1.579 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2019 | 1/3 | SYR4 |
| Pfba | 0.0084 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2025
Highest in the city: 0.0104 µg/L — LOGAN CO RWD #1 · 8,907 people · 2025 | 2/3 | UCMR-5 |
| Pfpea | 0.0048 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2025
Highest in the city: 0.0080 µg/L — LOGAN CO RWD #1 · 8,907 people · 2025 | 2/3 | UCMR-5 |
| Pfhxa | 0.0044 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2025
Highest in the city: 0.0064 µg/L — LOGAN CO RWD #1 · 8,907 people · 2025 | 2/3 | UCMR-5 |
| PFBS | 0.0038 µg/L No EPA limit set Main supplier: GUTHRIE · 9,925 people · 2025
Highest in the city: 0.0059 µg/L — LOGAN CO RWD #1 · 8,907 people · 2025 | 2/3 | UCMR-5 |
| Lead | 0.0046 mg/L 31% of the EPA limit 0.0150 mg/L Main supplier: GUTHRIE · 9,925 people · 2025 | 3/3 | LCR |
| PFOA | 0.0043 µg/L No EPA limit set Highest in the city: LOGAN CO RWD #1 · 8,907 people · 2025 | 1/3 | 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 Guthrie
| Supplier | Population served |
|---|---|
| GUTHRIE | 9,925 |
| LOGAN CO RWD #1 | 8,907 |
| PEPPERS RANCH | 99 |
Frequently asked questions about Guthrie tap water
Is Guthrie tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Guthrie. 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 Guthrie?
3 public water suppliers report drinking-water monitoring for Guthrie, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Guthrie's water?
The contaminants EPA monitoring detected in Guthrie include Nitrate-Nitrite, Chlorite, Barium, Copper, Fluoride. 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.