PFAS in Colorado drinking water
158 community water systems tested
9.5%
of tested systems detected PFOA or PFOS
(15/158)
(15/158)
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.
| System | City | Population | PFAS (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 |