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PFAS in Colorado drinking water

158 community water systems tested

9.5%
of tested systems detected PFOA or PFOS
(15/158)

PFAS — “forever chemicals” — are synthetic compounds that accumulate in the body and are linked to cancer, liver damage and immune effects. In 2024 the EPA set enforceable limits of 4 parts per trillion each for PFOA and PFOS. These are the only nationwide PFAS measurements, from the EPA’s UCMR-5 program.

Water systems

PFAS value per system, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Systems that detected PFOA or PFOS are highlighted and listed first. “Not detected” means the contaminant was measured but not found.
SystemCityPopulationPFAS (ug/L)
SNAKE RIVER WD 9,900 0.0220 ug/L
WIDEFIELD WSD 27,640 0.0158 ug/L
BRIGHTON CITY OF 56,304 0.0106 ug/L
MOUNTAIN VILLAGE TOWN OF 9,700 0.0075 ug/L
THORNTON CITY OF 226,465 0.0071 ug/L
TODD CREEK VILLAGE MD 7,363 0.0068 ug/L
CHEROKEE MD 29,610 0.0061 ug/L
STONEGATE MD 15,295 0.0056 ug/L
PARKER WSD 75,949 0.0048 ug/L
LITTLE THOMPSON WD 25,654 0.0048 ug/L
ARAPAHOE CNTY WWWA 31,000 0.0046 ug/L
GUNNISON CITY OF 9,610 0.0042 ug/L
ROCKY FORD CITY OF 4,443 0.0041 ug/L
ENGLEWOOD CITY OF 57,332 0.0040 ug/L
COTTONWOOD WSD 10,867 0.0040 ug/L
DENVER WATER BOARD 1,287,000 Not detected
AURORA CITY OF 533,407 Not detected
COLORADO SPRINGS UTILITIES 464,111 Not detected
WESTMINSTER CITY OF 202,078 Not detected
FT COLLINS CITY OF 179,901 Not detected
ARVADA CITY OF 171,610 Not detected
BOULDER CITY OF 166,080 Not detected
GREELEY CITY OF 132,310 Not detected
PUEBLO BOARD OF WW 114,070 Not detected
CASTLE ROCK TOWN OF 110,298 Not detected
BROOMFIELD CITY AND COUNTY OF BROOMFIELD 106,153 Not detected
LONGMONT CITY OF 104,178 Not detected
HIGHLANDS RANCH WSD 103,444 Not detected
UTE WCD 92,580 Not detected
LOVELAND CITY OF 91,077 Not detected
CONSOLIDATED MUTUAL MAPLE GROVE 81,400 Not detected
SOUTH ADAMS COUNTY WSD 75,559 Not detected
EAST CHERRY CREEK VALLEY WSD 66,130 Not detected
FT COLLINS LOVELAND WD 63,532 Not detected
EAGLE RIVER WSD 51,515 Not detected
NORTHGLENN CITY OF 48,927 Not detected
US DEPARTMENT OF THE ARMY FORT CARSON 48,000 Not detected
ERIE TOWN OF 47,444 Not detected
GOLDEN CITY OF 38,288 Not detected
CANON CITY CITY OF 34,800 Not detected
CLIFTON WD 34,500 Not detected
DURANGO CITY OF 33,787 Not detected
ASPEN CITY OF 31,100 Not detected
PUEBLO WEST MD 30,000 Not detected
LAFAYETTE CITY OF 28,700 Not detected
BRECKENRIDGE TOWN OF 28,315 Not detected
EAST LARIMER COUNTY WD 27,944 Not detected
FIRESTONE TOWN OF 27,798 Not detected
CSU MAIN AND WEST HOUSING CAMPUS 27,375 Not detected
JOHNSTOWN TOWN OF 27,295 Not detected
GRAND JUNCTION CITY OF 26,000 Not detected
FOUNTAIN CITY OF 25,130 Not detected
WINDSOR TOWN OF 23,500 Not detected
MERIDIAN MD 23,415 Not detected
LOUISVILLE CITY OF 20,975 Not detected
TRI COUNTY WCD 20,490 Not detected
LEFT HAND WD 20,280 Not detected
SECURITY WATER DISTRICT 20,000 Not detected
EVANS CITY OF 19,369 Not detected
MONTROSE CITY OF 19,305 Not detected
MT WERNER WD 19,000 Not detected
WOODMOOR WSD 18,031 Not detected
SUPERIOR MD NO 1 17,900 Not detected
FREDERICK TOWN OF 17,173 Not detected
US AIR FORCE ACADEMY 16,876 Not detected
ESTES PARK TOWN OF 16,722 Not detected
NORTH WELD COUNTY WD 15,890 Not detected
EVERGREEN MD 15,750 Not detected
GYPSUM TOWN OF 15,272 Not detected
BLACK HAWK CITY OF 15,167 Not detected
STERLING CITY OF 15,100 Not detected
BERTHOUD TOWN OF 14,211 Not detected
WOODMEN HILLS MD 13,888 Not detected
MONTEZUMA WC 13,797 Not detected
ROXBOROUGH WSD 13,765 Not detected
PINERY WWD 12,901 Not detected
CASTLE PINES NORTH MD 12,800 Not detected
MERIDIAN SERVICE MD 12,760 Not detected
FT LUPTON CITY OF 12,099 Not detected
FT MORGAN CITY OF 12,000 Not detected
SEVERANCE TOWN OF 11,733 Not detected
WELLINGTON TOWN OF 11,720 Not detected
FEDERAL HEIGHTS CITY OF 11,678 Not detected
TRINIDAD CITY OF 11,400 Not detected
ALAMOSA CITY OF 11,271 Not detected
PAGOSA AREA WSD 11,069 Not detected
IDAHO SPRINGS CITY OF 10,432 Not detected
NORTH TABLE MOUNTAIN WSD 10,000 Not detected
STEAMBOAT SPRINGS CITY OF 9,950 Not detected
MORRISON TOWN OF 9,887 Not detected
ST CHARLES MESA WD 9,690 Not detected
RIFLE CITY OF 9,489 Not detected
GLENWOOD SPRINGS CITY OF 9,428 Not detected
MILLIKEN TOWN OF 9,200 Not detected
CRAIG CITY OF 8,930 Not detected
CORTEZ CITY OF 8,770 Not detected
DELTA CITY OF 8,700 Not detected
WOODLAND PARK CITY OF 8,500 Not detected
SILVERTHORNE TOWN OF 8,400 Not detected
LA JUNTA CITY OF 8,320 Not detected