Is Green River, WY Tap Water Safe? Quality & Contaminants

What was found in Green River's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Copper	2240 µg/L 172% of the EPA limit, in the worst sample — 1300 µg/L	5/6	SYR4
Nitrate-Nitrite	300 µg/L 3% of the EPA limit 10000 µg/L	1/6	SYR4
Fluoride	200 µg/L 5% of the EPA limit 4000 µg/L	1/6	SYR4
TTHM	103 µg/L 129% of the EPA limit, in the worst sample — 80 µg/L	5/6	SYR4
Chloroform	91 µg/L No EPA limit set	5/6	SYR4
Total Haloacetic Acids (HAA5)	57 µg/L 95% of the EPA limit 60 µg/L	5/6	SYR4
Trichloroacetic Acid	32 µg/L No EPA limit set	4/6	SYR4
Dichloroacetic Acid	24 µg/L No EPA limit set	4/6	SYR4
Lead	14 µg/L 93% of the EPA limit 15 µg/L	5/6	SYR4
Bromodichloromethane	12 µg/L No EPA limit set	5/6	SYR4
Combined Uranium	6.6 µg/L 22% of the EPA limit 30 µg/L	1/6	SYR4
Gross Beta Particle Activity	5.5 pCi/L No EPA limit set	1/6	SYR4
Gross Alpha, Excl. Radon And U	4.2 pCi/L 28% of the EPA limit 15 pCi/L	1/6	SYR4
Dibromochloromethane	3.9 µg/L No EPA limit set	5/6	SYR4
Monochloroacetic Acid	2.3 µg/L No EPA limit set	4/6	SYR4
Combined Radium (-226 And -228)	2.1 pCi/L 42% of the EPA limit 5 pCi/L	1/6	SYR4
Bromate	1.8 µg/L 18% of the EPA limit 10 µg/L	1/6	SYR4
Dibromoacetic Acid	1.3 µg/L No EPA limit set	4/6	SYR4
Monobromoacetic Acid	0.7400 µg/L No EPA limit set	2/6	SYR4
Lead	0.0030 mg/L 20% of the EPA limit 0.0150 mg/L	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 single worst sample on record — 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 highest level found 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.