What was found in Thermopolis'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 |
|---|---|---|---|
| Copper | 263 µg/L 20% of the EPA limit 1300 µg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019
Highest in the city: 508 µg/L — SOUTH THERMOPOLIS W&S DISTRICT · 450 people · 2018 | 6/6 | SYR4 |
| Fluoride | 465 µg/L 12% of the EPA limit 4000 µg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 1/6 | SYR4 |
| Nitrate | 300 µg/L 3% of the EPA limit 10000 µg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2012 | 1/6 | SYR4 |
| Nitrate-Nitrite | 300 µg/L 3% of the EPA limit 10000 µg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 1/6 | SYR4 |
| TTHM | 80.345 µg/L 100% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019
Highest in the city: 125.6 µg/L — OWL CREEK WATER DISTRICT · 100 people · 2019 | 6/6 | SYR4 |
| Chloroform | 56.55 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 4/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 34 µg/L 57% of the EPA limit 60 µg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 5/6 | SYR4 |
| Bromodichloromethane | 20.65 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019
Highest in the city: 21 µg/L — EAST THERMOPOLIS, TOWN OF · 254 people · 2019 | 4/6 | SYR4 |
| Dichloroacetic Acid | 20.7 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 4/6 | SYR4 |
| Trichloroacetic Acid | 14 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019
Highest in the city: 15.25 µg/L — OWL CREEK WATER DISTRICT · 100 people · 2019 | 4/6 | SYR4 |
| Dibromochloromethane | 10.65 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 4/6 | SYR4 |
| Lead | 2.85 µg/L 19% of the EPA limit 15 µg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019
Highest in the city: 6.25 µg/L — RED LANE DOMESTIC WATER, INC. · 110 people · 2019 | 4/6 | SYR4 |
| Monochloroacetic Acid | 3.65 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 2/6 | SYR4 |
| Monobromoacetic Acid | 0.8150 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019
Highest in the city: 2.0795 µg/L — EAST THERMOPOLIS, TOWN OF · 254 people · 2019 | 2/6 | SYR4 |
| Dibromoacetic Acid | 1.8 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019
Highest in the city: 1.89 µg/L — EAST THERMOPOLIS, TOWN OF · 254 people · 2019 | 4/6 | SYR4 |
| Bromoform | 1.557 µg/L No EPA limit set Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 4/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.5 pCi/L 10% of the EPA limit 15 pCi/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 1/6 | SYR4 |
| Combined Uranium | 0.3000 µg/L 1% of the EPA limit 30 µg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2019 | 1/6 | SYR4 |
| Asbestos | 0.1900 MFL 2.7% of the EPA limit 7 MFL Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2013 | 1/6 | SYR4 |
| Lead | 0.0040 mg/L 27% of the EPA limit 0.0150 mg/L Main supplier: THERMOPOLIS, TOWN OF · 2,775 people · 2025 | 6/6 | 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 Thermopolis
| Supplier | Population served |
|---|---|
| THERMOPOLIS, TOWN OF | 2,775 |
| SOUTH THERMOPOLIS W&S DISTRICT | 450 |
| LUCERNE WATER AND SEWER DIST. | 350 |
| EAST THERMOPOLIS, TOWN OF | 254 |
| RED LANE DOMESTIC WATER, INC. | 110 |
| OWL CREEK WATER DISTRICT | 100 |
Frequently asked questions about Thermopolis tap water
Is Thermopolis tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Thermopolis. 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 Thermopolis?
6 public water suppliers report drinking-water monitoring for Thermopolis, Wyoming to the EPA. Each is listed above with its population served.
What contaminants are in Thermopolis's water?
The contaminants EPA monitoring detected in Thermopolis include Copper, Fluoride, Nitrate, Nitrate-Nitrite, TTHM. 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.