PFAS in Wyoming tap water

1 of 33 tested systems measured above the federal limit. 3 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water system	Highest PFOA	Highest PFOS	Found	Against the 4 ppt limit
Riverton, City of	none detected	7 ppt	8 of 29	Above
Black Thunder Coal Mine	none detected	none detected	0 of 29	Within
Buffalo, City of	none detected	none detected	0 of 29	Within
Casper, City of	none detected	none detected	0 of 29	Within
Cheyenne Board of Public Utilities	none detected	none detected	0 of 29	Within
Cody, City of	none detected	none detected	0 of 29	Within
Douglas, City of	none detected	none detected	1 of 29	Within
Evanston, City of	none detected	none detected	0 of 29	Within
First Fike Subdivision	none detected	none detected	0 of 29	Within
Gillette, City of	none detected	none detected	0 of 29	Within
Green River, City of	none detected	none detected	0 of 29	Within
Gtnp-colter Bay Village	none detected	none detected	0 of 29	Within
High Meadow Ranch	none detected	none detected	0 of 29	Within
Jackson, Town of	none detected	none detected	1 of 29	Within
Kemmerer-diamondville Jpb	none detected	none detected	0 of 29	Within
Lander, City of	none detected	none detected	0 of 29	Within
Laramie, City of	none detected	none detected	0 of 29	Within
Lovell, Town of	none detected	none detected	0 of 29	Within
Mills, Town of	none detected	none detected	0 of 29	Within
Newcastle, City of	none detected	none detected	0 of 29	Within
Northwest Rural Water District, Wy	none detected	none detected	0 of 29	Within
Powell, City of	none detected	none detected	0 of 29	Within
Rawlins Water Supply, City of	none detected	none detected	0 of 29	Within
Rock Springs, City of	none detected	none detected	0 of 29	Within
Sheridan Wy, City of	none detected	none detected	0 of 29	Within
South Cheyenne Water & Sewer District	none detected	none detected	0 of 29	Within
Torrington Municipal Ws	none detected	none detected	0 of 29	Within
Usaf F.e. Warren Afb	none detected	none detected	0 of 29	Within
Wardwell Water & Sewer District	none detected	none detected	0 of 29	Within
Wheatland, Town of	none detected	none detected	0 of 29	Within
Worland Utilities Commission	none detected	none detected	0 of 29	Within
Ynp-canyon Village	none detected	none detected	0 of 29	Within
Ynp-old Faithful	none detected	none detected	0 of 29	Within

All 33 systems the EPA tested in Wyoming, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →