PFAS in Colorado tap water

13 of 165 tested systems measured above the federal limit. 39 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
Snake River Wd	5.8 ppt	22 ppt	7 of 29	Above
Widefield Wsd	10.5 ppt	15.8 ppt	8 of 29	Above
Brighton City of	5.3 ppt	10.6 ppt	7 of 29	Above
Mountain Village Town of	none detected	7.5 ppt	2 of 29	Above
Thornton City of	7.1 ppt	5 ppt	8 of 29	Above
Todd Creek Village Md	none detected	6.8 ppt	6 of 29	Above
Cherokee Md	6.1 ppt	none detected	4 of 29	Above
Stonegate Md	5.6 ppt	5.1 ppt	6 of 29	Above
Little Thompson Wd	4.8 ppt	none detected	1 of 29	Above
Parker Wsd	4.8 ppt	none detected	5 of 29	Above
Arapahoe Cnty Wwwa	4.6 ppt	none detected	5 of 29	Above
Gunnison City of	none detected	4.2 ppt	4 of 29	Above
Rocky Ford City of	none detected	4.1 ppt	3 of 29	Above
Cottonwood Wsd	4 ppt	none detected	5 of 29	Within
Englewood City of	4 ppt	none detected	5 of 29	Within
Advenir French Quarter	none detected	none detected	0 of 29	Within
Alamosa City of	none detected	none detected	0 of 29	Within
Antonito Town of	none detected	none detected	0 of 29	Within
Arvada City of	none detected	none detected	0 of 29	Within
Aspen City of	none detected	none detected	0 of 29	Within
Aurora City of	none detected	none detected	4 of 29	Within
Battlement Mesa Md	none detected	none detected	0 of 29	Within
Berthoud Town of	none detected	none detected	0 of 29	Within
Black Hawk City of	none detected	none detected	0 of 29	Within
Boulder City of	none detected	none detected	0 of 29	Within
Breckenridge Town of	none detected	none detected	0 of 29	Within
Broomfield City and County of	none detected	none detected	0 of 29	Within
Brush City of	none detected	none detected	0 of 29	Within
Buena Vista Town of	none detected	none detected	0 of 29	Within
Burlington City of	none detected	none detected	0 of 29	Within
Canon City City of	none detected	none detected	0 of 29	Within
Carbondale Town of	none detected	none detected	0 of 29	Within
Castle Pines North Md	none detected	none detected	4 of 29	Within
Castle Pines Village Md	none detected	none detected	0 of 29	Within
Castle Rock Town of	none detected	none detected	2 of 29	Within
Centennial Wsd	none detected	none detected	4 of 29	Within
Central City City of	none detected	none detected	0 of 29	Within
Central Weld Cnty Wd	none detected	none detected	0 of 29	Within
Chipeta Wd	none detected	none detected	1 of 29	Within
Clifton Wd	none detected	none detected	0 of 29	Within
Clock Tower Center	none detected	none detected	0 of 29	Within
Colorado Centre Md	none detected	none detected	0 of 29	Within
Colorado Springs Utilities	none detected	none detected	0 of 29	Within
Consolidated Mutual Maple Grove	none detected	none detected	3 of 29	Within
Consolidated Mutual Water Company	none detected	none detected	0 of 29	Within
Copper Mountain Consolidated Md	none detected	none detected	0 of 29	Within
Cortez City of	none detected	none detected	0 of 29	Within
Craig City of	none detected	none detected	0 of 29	Within
Crawford Mesa Wa	none detected	none detected	0 of 29	Within
Creede City of	none detected	none detected	0 of 29	Within
Csu Foothills Campus	none detected	none detected	1 of 29	Within
Csu Main and West Housing Campus	none detected	none detected	0 of 29	Within
Csu South Campus	none detected	none detected	0 of 29	Within
Dacono City of	none detected	none detected	0 of 29	Within
Delta City of	none detected	none detected	1 of 29	Within
Denver Water Board	none detected	none detected	0 of 29	Within
Dolores Town of	none detected	none detected	0 of 29	Within
Donala Wsd	none detected	none detected	0 of 29	Within
Durango City of	none detected	none detected	0 of 29	Within
Eagle River Wsd	none detected	none detected	0 of 29	Within
Eagle Town of	none detected	none detected	0 of 29	Within
East Cherry Creek Valley Wsd	none detected	none detected	2 of 29	Within
East Larimer County Wd	none detected	none detected	0 of 29	Within
Eaton Town of	none detected	none detected	0 of 29	Within
Eldora Mountain Resort	none detected	none detected	0 of 29	Within
Erie Town of	none detected	none detected	0 of 29	Within
Estes Park Town of	none detected	none detected	0 of 29	Within
Evans City of	none detected	none detected	0 of 29	Within
Evergreen Md	none detected	none detected	0 of 29	Within
Federal Heights City of	none detected	none detected	0 of 29	Within
Firestone Town of	none detected	none detected	0 of 29	Within
Florence City of	none detected	none detected	0 of 29	Within
Fountain City of	none detected	none detected	3 of 29	Within
Frederick Town of	none detected	none detected	0 of 29	Within
Frisco Town of	none detected	none detected	0 of 29	Within
Ft Collins City of	none detected	none detected	0 of 29	Within
Ft Collins Loveland Wd	none detected	none detected	0 of 29	Within
Ft Lupton City of	none detected	none detected	0 of 29	Within
Ft Morgan City of	none detected	none detected	0 of 29	Within
Genesee Wsd	none detected	none detected	0 of 29	Within
Glenwood Springs City of	none detected	none detected	0 of 29	Within
Golden City of	none detected	none detected	0 of 29	Within
Golden Terrace West	none detected	none detected	0 of 29	Within
Grand County Water No 1	none detected	none detected	1 of 29	Within
Grand Junction City of	none detected	none detected	0 of 29	Within
Greeley City of	none detected	none detected	0 of 29	Within
Gypsum Town of	none detected	none detected	0 of 29	Within
Hayden Town of	none detected	none detected	0 of 29	Within
Hudson Town of	none detected	none detected	0 of 29	Within
Idaho Springs City of	none detected	none detected	0 of 29	Within
Inverness Wsd	none detected	none detected	1 of 29	Within
Johnstown Town of	none detected	none detected	0 of 29	Within
La Junta City of	none detected	none detected	0 of 29	Within
Lafayette City of	none detected	none detected	0 of 29	Within
Lamar City of	none detected	none detected	2 of 29	Within
Left Hand Wd	none detected	none detected	0 of 29	Within
Limon Town of	none detected	none detected	0 of 29	Within
Lochbuie Town of	none detected	none detected	4 of 29	Within
Longmont City of	none detected	none detected	0 of 29	Within
Louisville City of	none detected	none detected	0 of 29	Within
Loveland City of	none detected	none detected	0 of 29	Within
Manitou Springs City of	none detected	none detected	0 of 29	Within
Menoken Wd	none detected	none detected	0 of 29	Within
Meridian Md	none detected	none detected	0 of 29	Within
Meridian Service Md	none detected	none detected	0 of 29	Within
Mid Valley Md	none detected	none detected	0 of 29	Within
Milliken Town of	none detected	none detected	0 of 29	Within
Monte Vista City of	none detected	none detected	0 of 29	Within
Montezuma Wc	none detected	none detected	0 of 29	Within
Montrose City of	none detected	none detected	0 of 29	Within
Monument Town of	none detected	none detected	0 of 29	Within
Morgan County Quality Wd	none detected	none detected	0 of 29	Within
Morrison Town of	none detected	none detected	2 of 29	Within
Mt Werner Wd	none detected	none detected	0 of 29	Within
Navajo River Ranch Poa	none detected	none detected	0 of 29	Within
New Castle Town of	none detected	none detected	0 of 29	Within
North Holbrook Wc	none detected	none detected	0 of 29	Within
North Table Mountain Wsd	none detected	none detected	0 of 29	Within
North Weld County Wd	none detected	none detected	0 of 29	Within
Northern Colorado Wa	none detected	none detected	0 of 29	Within
Northern Douglas County Wsd	none detected	none detected	4 of 29	Within
Northglenn City of	none detected	none detected	0 of 29	Within
Pagosa Area Wsd	none detected	none detected	0 of 29	Within
Paint Brush Hills	none detected	none detected	0 of 29	Within
Park Center Wd	none detected	none detected	0 of 29	Within
Parkville Wd	none detected	none detected	0 of 29	Within
Patterson Valley Wc	none detected	none detected	0 of 29	Within
Perry Park Wsd	none detected	none detected	0 of 29	Within
Pinery Wwd	none detected	none detected	4 of 29	Within
Pueblo Board of Ww	none detected	none detected	0 of 29	Within
Pueblo West Md	none detected	none detected	0 of 29	Within
Rifle City of	none detected	none detected	0 of 29	Within
Roxborough Wsd	none detected	none detected	0 of 29	Within
Salida City of	none detected	none detected	0 of 29	Within
Security Wsd	none detected	none detected	3 of 29	Within
Severance Town of	none detected	none detected	0 of 29	Within
Silverthorne Town of	none detected	none detected	2 of 29	Within
Snowmass Village Wsd	none detected	none detected	0 of 29	Within
South Adams County Wsd	none detected	none detected	3 of 29	Within
St Charles Mesa Wd	none detected	none detected	1 of 29	Within
Steamboat Springs City of	none detected	none detected	0 of 29	Within
Sterling City of	none detected	none detected	0 of 29	Within
Stratmoor Hills Wsd	none detected	none detected	4 of 29	Within
Suburban Water	none detected	none detected	1 of 29	Within
Superior Md No 1	none detected	none detected	0 of 29	Within
Telluride Town of	none detected	none detected	0 of 29	Within
Tri County Wcd	none detected	none detected	0 of 29	Within
Trinidad City of	none detected	none detected	0 of 29	Within
Triview Md	none detected	none detected	0 of 29	Within
Two Rivers Village	none detected	none detected	0 of 29	Within
US Air Force Academy	none detected	none detected	0 of 29	Within
US Department of the Army Fort Carson	none detected	none detected	0 of 29	Within
Ute Wcd	none detected	none detected	0 of 29	Within
Vail Assoc Midvail Eagle	none detected	none detected	0 of 29	Within
Wellington Town of	none detected	none detected	0 of 29	Within
West Fort Collins Wd	none detected	none detected	0 of 29	Within
Westminster City of	none detected	none detected	0 of 29	Within
Windsor Town of	none detected	none detected	0 of 29	Within
Winter Park Wsd	none detected	none detected	0 of 29	Within
Woodland Park City of	none detected	none detected	0 of 29	Within
Woodmen Hills Md	none detected	none detected	0 of 29	Within
Woodmoor Wsd	none detected	none detected	1 of 29	Within
Ymca Rockies Wind River	none detected	none detected	0 of 29	Within
Ymca Snow Mtn Ranch	none detected	none detected	0 of 29	Within
Yuma City of	none detected	none detected	0 of 29	Within

All 165 systems the EPA tested in Colorado, 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 →