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PFAS in drinking water: Colorado

EPA UCMR 5 results for 165 public water systems. 39 had at least one PFAS detected; 13 had a highest single PFOA or PFOS result above 4.0 ppt.

UCMR 5 is a one-time EPA monitoring program, not a compliance determination. The values shown are the highest single sample result at any of the system's sampling points; one result above 4.0 ppt does not mean the system violates the PFAS rule, which is judged on running annual averages under separate compliance monitoring. Results describe the public water system, not an individual home.

Water systemServesPFOA max (ppt)PFOS max (ppt)PFAS detected
Advenir French Quarter
CO0116104		DenverNDND0
Alamosa City Of
CO0102100		Alamosa CountyNDND0
Antonito Town Of
CO0111100		Conejos CountyNDND0
Arapahoe Cnty Wwwa
CO0203002		Arapahoe County4.6ND5
Arvada City Of
CO0130001		Jefferson CountyNDND0
Aspen City Of
CO0149122		Pitkin CountyNDND0
Aurora City Of
CO0103005		Arapahoe CountyNDND4
Battlement Mesa MD
CO0123133		Garfield CountyNDND0
Berthoud Town Of
CO0135138		Larimer CountyNDND0
Black Hawk City Of
CO0124147		Gilpin CountyNDND0
Boulder City Of
CO0107152		Boulder CountyNDND0
Breckenridge Town Of
CO0159020		Summit CountyNDND0
Brighton City Of
CO0101025		Adams County5.310.67
Broomfield City and County Of
CO0107155		BroomfieldNDND0
Brush City Of
CO0144001		Morgan CountyNDND0
Buena Vista Town Of
CO0108300		Chaffee CountyNDND0
Burlington City Of
CO0132005		Kit Carson CountyNDND0
Canon City City Of
CO0122100		Fremont CountyNDND0
Carbondale Town Of
CO0123167		Garfield CountyNDND0
Castle Pines North MD
CO0118006		Douglas CountyNDND4
Castle Pines Village MD
CO0118005		Douglas CountyNDND0
Castle Rock Town Of
CO0118010		Douglas CountyNDND2
Centennial WSD
CO0118015		Douglas CountyNDND4
Central City City Of
CO0124171		Gilpin CountyNDND0
Central Weld Cnty WD
CO0162122		Weld CountyNDND0
Cherokee MD
CO0121125		El Paso County6.1ND4
Chipeta WD
CO0143176		Montrose CountyNDND1
Clifton WD
CO0139180		Mesa CountyNDND0
Clock Tower Center
CO0218099		Douglas CountyNDND0
Colorado Centre MD
CO0121140		El Paso CountyNDND0
Colorado Springs Utilities
CO0121150		El Paso CountyNDND0
Consolidated Mutual Maple Grove
CO0130020		Jefferson CountyNDND3
Consolidated Mutual Water Company
CO0130145		Jefferson CountyNDND0
Copper Mountain Consolidated MD
CO0159030		Summit CountyNDND0
Cortez City Of
CO0142200		Montezuma CountyNDND0
Cottonwood WSD
CO0118020		Douglas County4ND5
Craig City Of
CO0141188		Moffat CountyNDND0
Crawford Mesa WA
CO0115189		Delta CountyNDND0
Creede City Of
CO0140500		Mineral CountyNDND0
Csu Foothills Campus
CO0235182		Larimer CountyNDND1
Csu Main and West Housing Campus
CO0235184		Larimer CountyNDND0
Csu South Campus
CO0235181		Fort CollinsNDND0
Dacono City Of
CO0162200		Weld CountyNDND0
Delta City Of
CO0115205		Delta CountyNDND1
Denver Water Board
CO0116001		Denver CountyNDND0
Dolores Town Of
CO0142400		Montezuma CountyNDND0
Donala WSD
CO0121175		El Paso CountyNDND0
Durango City Of
CO0134150		La Plata CountyNDND0
Eagle River WSD
CO0119802		Eagle CountyNDND0
Eagle Town Of
CO0119233		Eagle CountyNDND0
East Cherry Creek Valley WSD
CO0103035		Arapahoe CountyNDND2
East Larimer County WD
CO0135233		Larimer CountyNDND0
Eaton Town Of
CO0162233		Weld CountyNDND0
Eldora Mountain Resort
CO0207466		Boulder CountyNDND0
Englewood City Of
CO0103045		Arapahoe County4ND5
Erie Town Of
CO0162255		Boulder CountyNDND0
Estes Park Town Of
CO0135257		Larimer CountyNDND0
Evans City Of
CO0162260		Weld CountyNDND0
Evergreen MD
CO0130030		Jefferson CountyNDND0
Federal Heights City Of
CO0101055		Adams CountyNDND0
Firestone Town Of
CO0162476		Weld CountyNDND0
Florence City Of
CO0122500		Fremont CountyNDND0
Fountain City Of
CO0121275		El Paso CountyNDND3
Frederick Town Of
CO0162288		Weld CountyNDND0
Frisco Town Of
CO0159055		Summit CountyNDND0
Ft Collins City Of
CO0135291		Larimer CountyNDND0
Ft Collins Loveland WD
CO0135292		Larimer CountyNDND0
Ft Lupton City Of
CO0162291		Weld CountyNDND0
Ft Morgan City Of
CO0144005		Morgan CountyNDND0
Genesee WSD
CO0130035		Jefferson CountyNDND0
Glenwood Springs City Of
CO0123314		Garfield CountyNDND0
Golden City Of
CO0130040		Jefferson CountyNDND0
Golden Terrace West
CO0130319		GoldenNDND0
Grand County Water No 1
CO0125323		Grand CountyNDND1
Grand Junction City Of
CO0139321		Mesa CountyNDND0
Greeley City Of
CO0162321		Weld CountyNDND0
Gunnison City Of
CO0126325		Gunnison CountyND4.24
Gypsum Town Of
CO0119329		Eagle CountyNDND0
Hayden Town Of
CO0154333		Routt CountyNDND0
Hudson Town Of
CO0162359		Weld CountyNDND0
Idaho Springs City Of
CO0110020		Clear Creek CountyNDND0
Inverness WSD
CO0203012		Arapahoe CountyNDND1
Johnstown Town Of
CO0162418		Weld CountyNDND0
La Junta City Of
CO0145420		Otero CountyNDND0
Lafayette City Of
CO0107473		Boulder CountyNDND0
Lamar City Of
CO0150700		Prowers CountyNDND2
Left Hand WD
CO0107471		Boulder CountyNDND0
Limon Town Of
CO0137015		Lincoln CountyNDND0
Little Thompson WD
CO0135477		Larimer County4.8ND1
Lochbuie Town Of
CO0162486		Weld CountyNDND4
Longmont City Of
CO0107485		Boulder CountyNDND0
Louisville City Of
CO0107487		Boulder CountyNDND0
Loveland City Of
CO0135485		Larimer CountyNDND0
Manitou Springs City Of
CO0121450		El Paso CountyNDND0
Menoken WD
CO0143506		Montrose CountyNDND0
Meridian MD
CO0218015		Douglas CountyNDND0
Meridian Service MD
CO0121455		El Paso CountyNDND0
Mid Valley MD
CO0119508		Eagle CountyNDND0
Milliken Town Of
CO0162511		Weld CountyNDND0
Monte Vista City Of
CO0153600		Rio Grande CountyNDND0
Montezuma WC
CO0142900		Montezuma CountyNDND0
Montrose City Of
CO0143518		Montrose CountyNDND0
Monument Town Of
CO0121475		El Paso CountyNDND0
Morgan County Quality WD
CO0144020		Morgan CountyNDND0
Morrison Town Of
CO0130085		Jefferson CountyNDND2
Mountain Village Town Of
CO0157400		San Miguel CountyND7.52
Mt Werner WD
CO0154524		Routt CountyNDND0
Navajo River Ranch Poa
CO0104533		Archuleta CountyNDND0
New Castle Town Of
CO0123538		Garfield CountyNDND0
North Holbrook WC
CO0145630		Otero CountyNDND0
North Table Mountain WSD
CO0130105		Jefferson CountyNDND0
North Weld County WD
CO0162553		Weld CountyNDND0
Northern Colorado WA
CO0135554		Larimer CountyNDND0
Northern Douglas County WSD
CO0118016		Douglas CountyNDND4
Northglenn City Of
CO0101115		Adams CountyNDND0
Pagosa Area WSD
CO0104300		Archuleta CountyNDND0
Paint Brush Hills
CO0221690		El Paso CountyNDND0
Park Center WD
CO0122600		Fremont CountyNDND0
Parker WSD
CO0118040		Douglas County4.8ND5
Parkville WD
CO0133700		Lake CountyNDND0
Patterson Valley WC
CO0145540		Otero CountyNDND0
Perry Park WSD
CO0118045		Douglas CountyNDND0
Pinery WWD
CO0118025		Douglas CountyNDND4
Pueblo Board of WW
CO0151500		Pueblo CountyNDND0
Pueblo West MD
CO0151650		Pueblo CountyNDND0
Rifle City Of
CO0123676		Garfield CountyNDND0
Rocky Ford City Of
CO0145600		Otero CountyND4.13
Roxborough WSD
CO0118055		Douglas CountyNDND0
Salida City Of
CO0108700		Chaffee CountyNDND0
Security WSD
CO0121775		El Paso CountyNDND3
Severance Town Of
CO0162707		Weld CountyNDND0
Silverthorne Town Of
CO0159095		Summit CountyNDND2
Snake River WD
CO0159105		Summit County5.8227
Snowmass Village WSD
CO0149717		Pitkin CountyNDND0
South Adams County WSD
CO0101140		Adams CountyNDND3
St Charles Mesa WD
CO0151750		Pueblo CountyNDND1
Steamboat Springs City Of
CO0154725		Routt CountyNDND0
Sterling City Of
CO0138045		Logan CountyNDND0
Stonegate MD
CO0118076		Douglas County5.65.16
Stratmoor Hills WSD
CO0121800		El Paso CountyNDND4
Suburban Water
CO0143515		Montrose CountyNDND1
Superior MD No 1
CO0107725		Boulder CountyNDND0
Telluride Town Of
CO0157800		San Miguel CountyNDND0
Thornton City Of
CO0101150		Adams County7.158
Todd Creek Village MD
CO0101157		Adams CountyND6.86
Tri County WCD
CO0143755		Montrose CountyNDND0
Trinidad City Of
CO0136800		Las Animas CountyNDND0
Triview MD
CO0121840		El Paso CountyNDND0
Two Rivers Village
CO0119720		Eagle CountyNDND0
Us Air Force Academy
CO0121845		El Paso CountyNDND0
Us Department of the Army Fort Carson
CO0221445		El Paso CountyNDND0
Ute WCD
CO0139791		Mesa CountyNDND0
Vail Assoc Midvail Eagle
CO0219800		Eagle CountyNDND0
Wellington Town Of
CO0135838		Larimer CountyNDND0
West Fort Collins WD
CO0135290		Larimer CountyNDND0
Westminster City Of
CO0101170		Adams CountyNDND0
Widefield WSD
CO0121900		El Paso County10.515.88
Windsor Town Of
CO0162843		Weld CountyNDND0
Winter Park WSD
CO0125843		Grand CountyNDND0
Woodland Park City Of
CO0160900		Teller CountyNDND0
Woodmen Hills MD
CO0121930		El Paso CountyNDND0
Woodmoor WSD
CO0121950		El Paso CountyNDND1
Ymca Rockies Wind River
CO0135883		Larimer CountyNDND0
Ymca Snow Mtn Ranch
CO0125916		Grand CountyNDND0
Yuma City Of
CO0163020		Yuma CountyNDND0

ND = not detected (below the 4 ppt UCMR 5 reporting level). Values are the highest single sample result, not an annual average.

Source: EPA UCMR 5 final occurrence data (EPA page last updated 2026-08-28; samples collected January 2023 – December 2025) ↗.

PFAS disclaimer: PFAS results are copied from EPA's UCMR 5 dataset and describe samples taken at a public water system's entry points between 2023 and 2025, not water at any specific address. Levels may have changed since sampling (for example, after new treatment). “Not detected” means below EPA's UCMR 5 minimum reporting level, not zero. This is not a compliance determination or a water test. Contact your water utility for current information.