Wyoming tap water, by utility.

34 utilities with a full report, serving 416,703 people as they report it. Regulated PFAS turned up at 3 of them.

Wyoming utilities by population served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Cheyenne Board of Public Utilities	Cheyenne	64,165	None found	0
City of Casper	Casper	59,000	None found	0
City of Laramie	Laramie	32,395	None found	0
City of Gillette	Gillette	32,222	None found	0
Town of Jackson	Jackson	24,760	PFHxS	0
City of Rock Springs	Rock Springs	24,000	None found	0
City of Sheridan	Sheridan	22,700	None found	0
City of Evanston	Evanston	11,727	None found	0
City of Green River	Green River	10,500	None found	0
City of Riverton	Riverton	10,330	PFOS, PFHxS, PFBS	2
City of Cody	Cody	10,224	None found	0
South Cheyenne Water & Sewer District	Cheyenne	10,000	None found	0
City of Rawlins Water Supply	Rawlins	9,006	None found	5
Ynp - Old Faithful	Yellowstone Np	7,675	None found	11
City of Lander	Lander	7,615	None found	1
Northwest Rural Water District	Cody	7,330	None found	0
City of Torrington Municipal Water Dept	Torrington	6,847	None found	0
City of Douglas	Douglas	6,400	None found	0
City of Powell	Powell	6,310	None found	0
Ynp - Lake Village	Yellowstone Nt	5,925	Not sampled	1
USAF F.E. Warren AFB	Cheyenne	5,500	None found	0
Worland Utilities Commission	Worland	4,787	None found	0
Gtnp - Colter Bay Village	Moose	4,514	None found	0
City of Buffalo	Buffalo	4,419	None found	6
Arapahoe Comm Water System	Ethete	4,100	Not sampled	1
City of Mills	Mills	4,050	None found	3
Town of Bar Nunn	Mills	4,000	None found	0
Town of Wheatland	Wheatland	3,659	None found	5
City of Newcastle	Newcastle	3,595	None found	0
Kemmerer - Diamondville Jpb	Kemmerer	3,348	None found	10
Fort Washakie	Fort Washakie	2,620	PFOA	0
Town of Lovell	Lovell	2,250	None found	0
High Meadow Ranch	Pinedale	580	None found	0
First Fike Subdivision	Riverton	150	None found	1
Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. Data: EPA SDWIS 2026 Q2 and UCMR 5.