Drinking water / CO
PFAS in Colorado drinking water
165 Colorado public water systems tested under UCMR5. 39 detected at least one PFAS compound; 126 detected none at the reporting thresholds. Values are the highest single result per compound, in ng/L (parts per trillion). The federal limit for PFOA and PFOS is 4 ng/L.
| Water system | Serves | Highest results (ng/L) | Reading |
|---|---|---|---|
| ARAPAHOE CNTY WWWA CO0203002 | Arapahoe | PFPeA 7.9PFHxA 6.8PFBS 6.1PFBA 5.5 | above final limit |
| BRIGHTON CITY OF CO0101025 | Adams | PFPeA 19.3PFOS 10.6 *PFBA 10.6PFHxA 9.4 | above final limit |
| CHEROKEE MD CO0121125 | El Paso | PFPeA 19.8PFHxA 17.6PFBS 7.6PFOA 6.1 * | above final limit |
| GUNNISON CITY OF CO0126325 | Gunnison | PFHxA 7.2PFPeA 5.1PFOS 4.2 *PFBS 3 | above final limit |
| LITTLE THOMPSON WD CO0135477 | Larimer | PFOA 4.8 * | above final limit |
| MOUNTAIN VILLAGE TOWN OF CO0157400 | San Miguel | PFHxS 8.1PFOS 7.5 * | above final limit |
| PARKER WSD CO0118040 | Douglas | PFPeA 14PFHxA 11.9PFBA 8.6PFOA 4.8 * | above final limit |
| ROCKY FORD CITY OF CO0145600 | Otero | PFBS 8.5PFHxS 6PFOS 4.1 * | above final limit |
| SNAKE RIVER WD CO0159105 | Summit | PFOS 22 *PFHxS 13PFPeA 8PFBS 6.6 | above final limit |
| STONEGATE MD CO0118076 | Douglas | PFOA 5.6 *PFOS 5.1 *PFBS 3.9PFHxA 3.8 | above final limit |
| THORNTON CITY OF CO0101150 | Adams | PFHxA 12.6PFPeA 12.4PFBA 10.4PFBS 8.1 | above final limit |
| TODD CREEK VILLAGE MD CO0101157 | Adams | PFBS 38PFHxA 8.7PFOS 6.8 *PFBA 6.8 | above final limit |
| WIDEFIELD WSD CO0121900 | El Paso | PFHxA 140.6PFPeA 108.9PFBA 42PFHxS 28.4 | above final limit |
| AURORA CITY OF CO0103005 | Arapahoe | PFBA 7.8PFPeA 7.2PFHxA 5.6PFBS 3.3 | detected |
| CASTLE PINES NORTH MD CO0118006 | Douglas | PFBA 6.4PFPeA 3.8PFBS 3.3PFHxA 3.2 | detected |
| CASTLE ROCK TOWN OF CO0118010 | Douglas | PFBA 5.1PFPeA 4.7 | detected |
| CENTENNIAL WSD CO0118015 | Douglas | PFBA 8.7PFPeA 5.7PFHxA 5.1PFBS 5 | detected |
| CHIPETA WD CO0143176 | Montrose | PFBA 29.5 | detected |
| CONSOLIDATED MUTUAL MAPLE GROVE CO0130020 | Jefferson | PFBS 4PFHxA 3.8PFPeA 3.5 | detected |
| COTTONWOOD WSD CO0118020 | Douglas | PFPeA 6.2PFBA 5.6PFHxA 5.4PFBS 4.7 | detected |
| CSU FOOTHILLS CAMPUS CO0235182 | Larimer | PFBA 5.9 | detected |
| DELTA CITY OF CO0115205 | Delta | PFBA 8.3 | detected |
| EAST CHERRY CREEK VALLEY WSD CO0103035 | Arapahoe | PFBA 6.2PFPeA 4.7 | detected |
| ENGLEWOOD CITY OF CO0103045 | Arapahoe | PFBA 6.4PFPeA 5.8PFBS 5.8PFHxA 5.5 | detected |
| FOUNTAIN CITY OF CO0121275 | El Paso | PFPeA 76.7PFHxA 50.8PFBA 33.8 | detected |
| GRAND COUNTY WATER NO 1 CO0125323 | Grand | PFBA 11.8 | detected |
| INVERNESS WSD CO0203012 | Arapahoe | PFBA 6.9 | detected |
| LAMAR CITY OF CO0150700 | Prowers | PFBS 4.7PFHxS 3.3 | detected |
| LOCHBUIE TOWN OF CO0162486 | Weld | PFPeA 6.8PFBS 6.3PFHxA 5.6PFHxS 3 | detected |
| MORRISON TOWN OF CO0130085 | Jefferson | PFHxA 4.4PFBS 3 | detected |
| NORTHERN DOUGLAS COUNTY WSD CO0118016 | Douglas | PFBA 8PFPeA 5.7PFHxA 5.3PFBS 5.3 | detected |
| PINERY WWD CO0118025 | Douglas | PFPeA 9.6PFHxA 8.1PFBA 5.8PFBS 5.3 | detected |
| SECURITY WSD CO0121775 | El Paso | PFPeA 63.6PFBA 35.4PFHxA 6.7 | detected |
| SILVERTHORNE TOWN OF CO0159095 | Summit | PFBS 5.9PFHxS 3.7 | detected |
| SOUTH ADAMS COUNTY WSD CO0101140 | Adams | PFPeA 11.4PFBA 9.5PFHxA 4.4 | detected |
| ST CHARLES MESA WD CO0151750 | Pueblo | PFBA 13 | detected |
| STRATMOOR HILLS WSD CO0121800 | El Paso | PFHxA 42PFPeA 27PFBA 16.1PFHpA 5.1 | detected |
| SUBURBAN WATER CO0143515 | Montrose | PFBA 8 | detected |
| WOODMOOR WSD CO0121950 | El Paso | PFBS 3.3 | detected |
* exceeds the final federal MCL for that compound. Detections of compounds whose limits EPA proposed to rescind in May 2026 are shown for information.
Systems with no PFAS detected
126 tested systems reported no PFAS above the laboratory reporting limits. Each has its own page with its sampling detail.
- ADVENIR FRENCH QUARTER
- ALAMOSA CITY OF
- ANTONITO TOWN OF
- ARVADA CITY OF
- ASPEN CITY OF
- BATTLEMENT MESA MD
- BERTHOUD TOWN OF
- BLACK HAWK CITY OF
- BOULDER CITY OF
- BRECKENRIDGE TOWN OF
- BROOMFIELD CITY AND COUNTY OF
- BRUSH CITY OF
- BUENA VISTA TOWN OF
- BURLINGTON CITY OF
- CANON CITY CITY OF
- CARBONDALE TOWN OF
- CASTLE PINES VILLAGE MD
- CENTRAL CITY CITY OF
- CENTRAL WELD CNTY WD
- CLIFTON WD
- CLOCK TOWER CENTER
- COLORADO CENTRE MD
- COLORADO SPRINGS UTILITIES
- CONSOLIDATED MUTUAL WATER COMPANY
- COPPER MOUNTAIN CONSOLIDATED MD
- CORTEZ CITY OF
- CRAIG CITY OF
- CRAWFORD MESA WA
- CREEDE CITY OF
- CSU MAIN AND WEST HOUSING CAMPUS
- CSU SOUTH CAMPUS
- DACONO CITY OF
- DENVER WATER BOARD
- DOLORES TOWN OF
- DONALA WSD
- DURANGO CITY OF
- EAGLE RIVER WSD
- EAGLE TOWN OF
- EAST LARIMER COUNTY WD
- EATON TOWN OF
- ELDORA MOUNTAIN RESORT
- ERIE TOWN OF
- ESTES PARK TOWN OF
- EVANS CITY OF
- EVERGREEN MD
- FEDERAL HEIGHTS CITY OF
- FIRESTONE TOWN OF
- FLORENCE CITY OF
- FREDERICK TOWN OF
- FRISCO TOWN OF
- FT COLLINS CITY OF
- FT COLLINS LOVELAND WD
- FT LUPTON CITY OF
- FT MORGAN CITY OF
- GENESEE WSD
- GLENWOOD SPRINGS CITY OF
- GOLDEN CITY OF
- GOLDEN TERRACE WEST
- GRAND JUNCTION CITY OF
- GREELEY CITY OF
- GYPSUM TOWN OF
- HAYDEN TOWN OF
- HUDSON TOWN OF
- IDAHO SPRINGS CITY OF
- JOHNSTOWN TOWN OF
- LA JUNTA CITY OF
- LAFAYETTE CITY OF
- LEFT HAND WD
- LIMON TOWN OF
- LONGMONT CITY OF
- LOUISVILLE CITY OF
- LOVELAND CITY OF
- MANITOU SPRINGS CITY OF
- MENOKEN WD
- MERIDIAN MD
- MERIDIAN SERVICE MD
- MID VALLEY MD
- MILLIKEN TOWN OF
- MONTE VISTA CITY OF
- MONTEZUMA WC
- MONTROSE CITY OF
- MONUMENT TOWN OF
- MORGAN COUNTY QUALITY WD
- MT WERNER WD
- NAVAJO RIVER RANCH POA
- NEW CASTLE TOWN OF
- NORTH HOLBROOK WC
- NORTH TABLE MOUNTAIN WSD
- NORTH WELD COUNTY WD
- NORTHERN COLORADO WA
- NORTHGLENN CITY OF
- PAGOSA AREA WSD
- PAINT BRUSH HILLS
- PARK CENTER WD
- PARKVILLE WD
- PATTERSON VALLEY WC
- PERRY PARK WSD
- PUEBLO BOARD OF WW
- PUEBLO WEST MD
- RIFLE CITY OF
- ROXBOROUGH WSD
- SALIDA CITY OF
- SEVERANCE TOWN OF
- SNOWMASS VILLAGE WSD
- STEAMBOAT SPRINGS CITY OF
- STERLING CITY OF
- SUPERIOR MD NO 1
- TELLURIDE TOWN OF
- TRI COUNTY WCD
- TRINIDAD CITY OF
- TRIVIEW MD
- TWO RIVERS VILLAGE
- US AIR FORCE ACADEMY
- US DEPARTMENT OF THE ARMY FORT CARSON
- UTE WCD
- VAIL ASSOC MIDVAIL EAGLE
- WELLINGTON TOWN OF
- WEST FORT COLLINS WD
- WESTMINSTER CITY OF
- WINDSOR TOWN OF
- WINTER PARK WSD
- WOODLAND PARK CITY OF
- WOODMEN HILLS MD
- YMCA ROCKIES WIND RIVER
- YMCA SNOW MTN RANCH
- YUMA CITY OF
A detection at the system level does not tell you what reaches one specific tap: levels vary by entry point, treatment train and plumbing. A certified lab test of your own tap settles it. Testing and treatment options