What was found in Green River'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 | 1361 µg/L 105% of the EPA limit, at the 95th percentile of samples — 1300 µg/L Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019 | 5/6 | SYR4 |
| Nitrate-Nitrite | 290 µg/L 2.9% of the EPA limit 10000 µg/L Highest in the city: ROCK SPRINGS/GREEN RIVER JPB · 25 people · 2019 | 1/6 | SYR4 |
| Fluoride | 200 µg/L 5% of the EPA limit 4000 µg/L Highest in the city: ROCK SPRINGS/GREEN RIVER JPB · 25 people · 2019 | 1/6 | SYR4 |
| TTHM | 42 µg/L 53% of the EPA limit 80 µg/L Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 69.8 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 5/6 | SYR4 |
| Chloroform | 32.2 µg/L No EPA limit set Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 62.38 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 5/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 30 µg/L 50% of the EPA limit 60 µg/L Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 52.1 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 5/6 | SYR4 |
| Trichloroacetic Acid | 17 µg/L No EPA limit set Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 29.3 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 4/6 | SYR4 |
| Dichloroacetic Acid | 15 µg/L No EPA limit set Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 23.1 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 4/6 | SYR4 |
| Bromodichloromethane | 8.26 µg/L No EPA limit set Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 11 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 5/6 | SYR4 |
| Lead | 5.75 µg/L 38% of the EPA limit 15 µg/L Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 8 µg/L — PIONEER MOBILE HOME PARK · 1,000 people · 2019 | 5/6 | SYR4 |
| Combined Uranium | 5.7 µg/L 19% of the EPA limit 30 µg/L Highest in the city: ROCK SPRINGS/GREEN RIVER JPB · 25 people · 2019 | 1/6 | SYR4 |
| Gross Beta Particle Activity | 5.5 pCi/L No EPA limit set Highest in the city: ROCK SPRINGS/GREEN RIVER JPB · 25 people · 2017 | 1/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.08 pCi/L 27% of the EPA limit 15 pCi/L Highest in the city: ROCK SPRINGS/GREEN RIVER JPB · 25 people · 2019 | 1/6 | SYR4 |
| Dibromochloromethane | 3.22 µg/L No EPA limit set Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019 | 5/6 | SYR4 |
| Monochloroacetic Acid | 1.5 µg/L No EPA limit set Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 2.075 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 4/6 | SYR4 |
| Combined Radium (-226 And -228) | 1.965 pCi/L 39% of the EPA limit 5 pCi/L Highest in the city: ROCK SPRINGS/GREEN RIVER JPB · 25 people · 2018 | 1/6 | SYR4 |
| Bromate | 1.66 µg/L 17% of the EPA limit 10 µg/L Highest in the city: ROCK SPRINGS/GREEN RIVER JPB · 25 people · 2019 | 1/6 | SYR4 |
| Dibromoacetic Acid | 1.02 µg/L No EPA limit set Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 1.045 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 4/6 | SYR4 |
| Monobromoacetic Acid | 0.5200 µg/L No EPA limit set Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2019
Highest in the city: 0.7310 µg/L — JAMESTOWN-RIO VISTA W&S DISTRICT · 560 people · 2019 | 2/6 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: GREEN RIVER, CITY OF · 10,500 people · 2025
Highest in the city: 0.0030 mg/L — PIONEER MOBILE HOME PARK · 1,000 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 Green River
| Supplier | Population served |
|---|---|
| GREEN RIVER, CITY OF | 10,500 |
| PIONEER MOBILE HOME PARK | 1,000 |
| JAMESTOWN-RIO VISTA W&S DISTRICT | 560 |
| DESERT TRAILS MHP | 112 |
| EMERALD RIVER ESTATES | 62 |
| ROCK SPRINGS/GREEN RIVER JPB | 25 |
Frequently asked questions about Green River tap water
Is Green River tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Green River. 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 Green River?
6 public water suppliers report drinking-water monitoring for Green River, Wyoming to the EPA. Each is listed above with its population served.
What contaminants are in Green River's water?
The contaminants EPA monitoring detected in Green River include Copper, Nitrate-Nitrite, Fluoride, TTHM, Chloroform. 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.