Drinking water / WY
PFAS in Wyoming drinking water
33 Wyoming public water systems tested under UCMR5. 3 detected at least one PFAS compound; 30 detected none at the reporting thresholds. Values are the highest single result per compound, in ng/L (parts per trillion). The federal limit for PFOA and PFOS is 4 ng/L.
| Water system | Serves | Highest results (ng/L) | Reading |
|---|---|---|---|
| RIVERTON, CITY OF WY5600047 | Fremont | PFHxS 37PFHxA 28PFPeA 19PFPeS 13 | above final limit |
| DOUGLAS, CITY OF WY5600137 | Converse | PFBA 10.8 | detected |
| JACKSON, TOWN OF WY5600213 | Teton | PFHxS 3.3 | detected |
* exceeds the final federal MCL for that compound. Detections of compounds whose limits EPA proposed to rescind in May 2026 are shown for information.
Systems with no PFAS detected
30 tested systems reported no PFAS above the laboratory reporting limits. Each has its own page with its sampling detail.
- BLACK THUNDER COAL MINE
- BUFFALO, CITY OF
- CASPER, CITY OF
- CHEYENNE BOARD OF PUBLIC UTILITIES
- CODY, CITY OF
- EVANSTON, CITY OF
- FIRST FIKE SUBDIVISION
- GILLETTE, CITY OF
- GREEN RIVER, CITY OF
- GTNP-COLTER BAY VILLAGE
- HIGH MEADOW RANCH
- KEMMERER-DIAMONDVILLE JPB
- LANDER, CITY OF
- LARAMIE, CITY OF
- LOVELL, TOWN OF
- MILLS, TOWN OF
- NEWCASTLE, CITY OF
- NORTHWEST RURAL WATER DISTRICT, WY
- POWELL, CITY OF
- RAWLINS WATER SUPPLY, CITY OF
- ROCK SPRINGS, CITY OF
- SHERIDAN WY, CITY OF
- SOUTH CHEYENNE WATER & SEWER DISTRICT
- TORRINGTON MUNICIPAL WS
- USAF F.E. WARREN AFB
- WARDWELL WATER & SEWER DISTRICT
- WHEATLAND, TOWN OF
- WORLAND UTILITIES COMMISSION
- YNP-CANYON VILLAGE
- YNP-OLD FAITHFUL
A detection at the system level does not tell you what reaches one specific tap: levels vary by entry point, treatment train and plumbing. A certified lab test of your own tap settles it. Testing and treatment options