What was found in St. Marys'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 | 4562.5 µg/L 46% of the EPA limit 10000 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 1/2 | SYR4 |
| Nitrate | 3850 µg/L 39% of the EPA limit 10000 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 1/2 | SYR4 |
| Copper | 822.55 µg/L 63% of the EPA limit 1300 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 2/2 | SYR4 |
| Fluoride | 469.5 µg/L 12% of the EPA limit 4000 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 1/2 | SYR4 |
| Nitrite | 284.5 µg/L 28% of the EPA limit 1000 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 1/2 | SYR4 |
| Barium | 72.915 µg/L 3.6% of the EPA limit 2000 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 1/2 | SYR4 |
| TTHM | 13.54 µg/L 17% of the EPA limit 80 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 40.505 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4.3275 µg/L 7.2% of the EPA limit 60 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 14.845 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 3.855 µg/L No EPA limit set Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 13.84 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Chloroform | 1.5125 µg/L No EPA limit set Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 12.2 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 5.731 µg/L No EPA limit set Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 11.49 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 5.9 µg/L No EPA limit set Highest in the city: PLEASANTS CO PSD · 2,357 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 1.346 µg/L No EPA limit set Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 5.765 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Lead | 1.47 µg/L 9.8% of the EPA limit 15 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 4.74 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 3.2125 µg/L No EPA limit set Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 4.16 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Bromoform | 4 µg/L No EPA limit set Main supplier: SAINT MARYS · 2,711 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 3.3155 µg/L No EPA limit set Highest in the city: PLEASANTS CO PSD · 2,357 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 1.04 µg/L No EPA limit set Main supplier: SAINT MARYS · 2,711 people · 2019
Highest in the city: 2.424 µg/L — PLEASANTS CO PSD · 2,357 people · 2019 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.33 pCi/L 8.9% of the EPA limit 15 pCi/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 1/2 | SYR4 |
| Tetrachloroethylene | 0.5400 µg/L 11% of the EPA limit 5 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 1/2 | SYR4 |
| Thallium, Total | 0.3000 µg/L 15% of the EPA limit 2 µg/L Main supplier: SAINT MARYS · 2,711 people · 2019 | 1/2 | SYR4 |
| Lead | 0.00055 mg/L 3.7% of the EPA limit 0.0150 mg/L Main supplier: SAINT MARYS · 2,711 people · 2025 | 2/2 | 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 St. Marys
| Supplier | Population served |
|---|---|
| SAINT MARYS | 2,711 |
| PLEASANTS CO PSD | 2,357 |
Frequently asked questions about St. Marys tap water
Is St. Marys tap water safe to drink?
EPA testing detected 22 contaminants in the water serving St. Marys. 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 St. Marys?
2 public water suppliers report drinking-water monitoring for St. Marys, West Virginia to the EPA. Each is listed above with its population served.
What contaminants are in St. Marys's water?
The contaminants EPA monitoring detected in St. Marys include Nitrate-Nitrite, Nitrate, Copper, Fluoride, Nitrite. 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.