Colorado tap water, by utility.

185 utilities with a full report, serving 6.8 million people as they report it. Regulated PFAS turned up at 26 of them.

Find a Colorado utility, city or county

The 100 largest, by people served

Colorado utilities, The 100 largest, by people served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Denver Water Board	Denver	1,287,000	None found	0
City of Aurora	Aurora	533,407	PFBS	0
Colorado Springs Utilities	Colorado Springs	464,111	None found	0
City of Thornton	Thornton	226,465	PFOA, PFOS, PFHxS, PFBS	0
City of Westminster	Westminster	202,078	None found	0
City of Ft Collins	Fort Collins	179,901	None found	1
City of Arvada	Arvada	171,610	None found	0
City of Boulder	Boulder	166,080	None found	2
City of Greeley	Greeley	132,310	None found	0
Pueblo Board of Ww	Pueblo	114,070	None found	0
Town of Castle Rock	Castle Rock	110,298	None found	0
County of Broomfield City and	Broomfield	106,153	None found	2
City of Longmont	Longmont	104,178	None found	0
Highlands Ranch WSD	Highlands Ranch	103,444	PFBS	0
Ute Wcd	Grand Junction	92,580	None found	0
City of Loveland	Loveland	91,077	None found	0
Consolidated Mutual Maple Grove	Lakewood	81,400	PFBS	0
Parker WSD	Parker	75,949	PFOA, PFBS	0
South Adams County WSD	Commerce City	75,559	None found	0
East Cherry Creek Valley WSD	Aurora	66,130	None found	0
Ft Collins Loveland WD	Fort Collins	63,532	None found	0
City of Englewood	Englewood	57,332	PFOA, PFBS	1
City of Brighton	Brighton	56,304	PFOA, PFOS, PFHxS, PFBS	1
Southgate WSD	Centennial	55,000	Not sampled	0
Eagle River WSD	Vail	51,515	None found	0
Green Mountain WSD	Lakewood	49,400	Not sampled	1
City of Northglenn	Northglenn	48,927	None found	0
Southwest Metropolitan WSD	Littleton	48,648	Not sampled	0
US Department of the Army Fort Carson	Fort Carson	48,000	None found	0
Town of Erie	Erie	47,444	None found	0
Bancroft Clover WSD	Lakewood	44,000	Not sampled	0
City of Golden	Golden	38,288	None found	0
City of Canon City	Canon City	34,800	None found	0
Clifton WD	Clifton	34,500	None found	1
City of Durango	Durango	33,787	None found	0
City of Aspen	Aspen	31,100	None found	0
Arapahoe Cnty Wwwa	Centennial	31,000	PFOA, PFBS	0
Bear Creek WSD	Lakewood	30,000	Not sampled	0
Pueblo West MD	Pueblo West	30,000	None found	3
Cherokee MD	Colorado Springs	29,610	PFOA, PFBS	0
City of Lafayette	Lafayette	28,700	None found	0
Town of Breckenridge	Breckenridge	28,315	None found	2
East Larimer County WD	Fort Collins	27,944	None found	0
Town of Firestone	Firestone	27,798	None found	0
Widefield WSD	Colorado Springs	27,640	PFOA, PFOS, PFHxS, PFBS	1
Csu Main and West Housing Campus	Fort Collins	27,375	None found	0
Town of Johnstown	Johnstown	27,295	None found	2
City of Grand Junction	Grand Junction	26,000	None found	0
Little Thompson WD	Berthoud	25,654	PFOA	0
City of Fountain	Fountain	25,130	None found	0
Crestview WSD	Denver	23,756	Not sampled	0
Town of Windsor	Windsor	23,500	None found	0
Meridian MD	Englewood	23,415	None found	0
Cherry Creek Valley WSD	Denver	22,000	Not sampled	0
City of Louisville	Louisville	20,975	None found	2
Tri County Wcd	Montrose	20,490	None found	0
Left Hand WD	Niwot	20,280	None found	0
Security Water District	Colorado Springs	20,000	None found	0
Wheat Ridge Water District	Wheat Ridge	20,000	Not sampled	1
Platte Canyon WSD	Littleton	19,485	Not sampled	0
City of Evans	Evans	19,369	None found	0
City of Montrose	Montrose	19,305	None found	0
MT Werner WD	Steamboat Springs	19,000	None found	5
Willows WD	Centennial	19,000	Not sampled	0
Woodmoor WSD	Monument	18,031	PFBS	1
Superior MD No 1	Superior	17,900	None found	2
Town of Frederick	Frederick	17,173	None found	0
US Air Force Academy	USAF Academy	16,876	None found	1
Town of Estes Park	Estes Park	16,722	None found	1
North Weld County WD	Lucerne	15,890	None found	0
Evergreen MD	Evergreen	15,750	None found	0
Stonegate MD	Parker	15,295	PFOA, PFOS, PFBS	0
Town of Gypsum	Gypsum	15,272	None found	0
City of Black Hawk	Black Hawk	15,167	None found	0
City of Sterling	Sterling	15,100	None found	0
North Washington Street WSD	Denver	14,500	Not sampled	1
Town of Berthoud	Berthoud	14,211	None found	1
Woodmen Hills MD	Falcon	13,888	None found	0
Montezuma WC	Dolores	13,797	None found	0
Roxborough WSD	Littleton	13,765	None found	1
Pinery Wwd	Parker	12,901	PFBS	1
Castle Pines North MD	Castle Pines	12,800	PFBS	0
Meridian Service MD	Peyton	12,760	None found	0
City of Ft Lupton	Fort Lupton	12,099	None found	14
City of Ft Morgan	Fort Morgan	12,000	None found	0
Ken Caryl WSD	Littleton	12,000	Not sampled	0
Lakehurst WSD	Littleton	12,000	Not sampled	0
Town of Severance	Severance	11,733	None found	0
Town of Wellington	Wellington	11,720	None found	3
City of Federal Heights	Federal Heights	11,678	None found	0
Sterling Ranch Cab	Littleton	11,501	Not sampled	0
City of Trinidad	Trinidad	11,400	None found	0
City of Alamosa	Alamosa	11,271	None found	0
Pagosa Area WSD	Pagosa Springs	11,069	None found	0
Cottonwood WSD	Englewood	10,867	PFOA, PFBS	0
City of Idaho Springs	Idaho Springs	10,432	None found	0
North Table Mountain WSD	Golden	10,000	None found	0
Valley WD	Wheat Ridge	10,000	Not sampled	0
City of Steamboat Springs	Steamboat Springs	9,950	None found	0
Snake River WD	Keystone	9,900	PFOA, PFOS, PFHxS, PFBS	0

Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. People served is what each utility reports to EPA. Data: EPA SDWIS 2026 Q2 and UCMR 5.