Colorado Tap Water Quality: Is It Safe to Drink?

2026 EPA water quality data for 1,046 community water systems serving a combined 7,184,013 people in Colorado. Find your water system to see violations, PFAS results, lead testing, and a safety grade — free.

Colorado draws drinking water from snowmelt-fed reservoirs, mountain streams, and the Denver Basin aquifer system. Uranium and radium occur naturally in some Front Range and Western Slope groundwater. Hard water is common across the state, with many areas exceeding 150 mg/L.

Find Your Water System in Colorado

Enter your ZIP code to see EPA violations, lead test results, PFAS data, and a safety grade for your water.

📊 Data from EPA’s SDWIS · 🔄 Updated quarterly · 🏛️ 1,046 water systems in Colorado

Showing the 250 largest of 1,046 community water systems in Colorado, by population served. Use the ZIP search above or the city links to find a smaller system.

DENVER WATER BOARD DENVER, CO · 1,287,000 people · Surface Water AURORA CITY OF AURORA, CO · 533,407 people · Surface Water COLORADO SPRINGS UTILITIES COLORADO SPRINGS, CO · 464,111 people · Surface Water THORNTON CITY OF THORNTON, CO · 226,465 people · Surface Water WESTMINSTER CITY OF WESTMINSTER, CO · 202,078 people · Surface Water FT COLLINS CITY OF FORT COLLINS, CO · 179,901 people · Surface Water ARVADA CITY OF ARVADA, CO · 171,610 people · Surface Water BOULDER CITY OF BOULDER, CO · 166,080 people · Surface Water GREELEY CITY OF GREELEY, CO · 132,310 people · Surface Water PUEBLO BOARD OF WW PUEBLO, CO · 114,070 people · Surface Water CASTLE ROCK TOWN OF CASTLE ROCK, CO · 106,822 people · Surface Water BROOMFIELD CITY AND COUNTY OF BROOMFIELD, CO · 106,153 people · Surface Water HIGHLANDS RANCH WSD HIGHLANDS RANCH, CO · 103,444 people · Surface Water LONGMONT CITY OF LONGMONT, CO · 102,866 people · Surface Water LOVELAND CITY OF LOVELAND, CO · 95,471 people · Surface Water UTE WCD GRAND JUNCTION, CO · 92,580 people · Surface Water CONSOLIDATED MUTUAL MAPLE GROVE LAKEWOOD, CO · 81,400 people · Surface Water PARKER WSD PARKER, CO · 75,949 people · Surface Water SOUTH ADAMS COUNTY WSD COMMERCE CITY, CO · 75,559 people · Surface Water Purchased EAST CHERRY CREEK VALLEY WSD AURORA, CO · 66,130 people · Surface Water Purchased FT COLLINS LOVELAND WD FORT COLLINS, CO · 63,532 people · Surface Water Purchased ENGLEWOOD CITY OF ENGLEWOOD, CO · 57,332 people · Surface Water BRIGHTON CITY OF BRIGHTON, CO · 56,304 people · Surface Water Purchased SOUTHGATE WSD CENTENNIAL, CO · 55,000 people · Surface Water Purchased EAGLE RIVER WSD VAIL, CO · 51,515 people · Surface Water GREEN MOUNTAIN WSD LAKEWOOD, CO · 49,400 people · Surface Water Purchased NORTHGLENN CITY OF NORTHGLENN, CO · 48,927 people · Surface Water SOUTHWEST METROPOLITAN WSD LITTLETON, CO · 48,648 people · Surface Water Purchased US DEPARTMENT OF THE ARMY FORT CARSON FORT CARSON, CO · 48,000 people · Surface Water Purchased BANCROFT CLOVER WSD LAKEWOOD, CO · 44,000 people · Surface Water Purchased ERIE TOWN OF ERIE, CO · 40,061 people · Surface Water GOLDEN CITY OF GOLDEN, CO · 38,288 people · Surface Water CANON CITY CITY OF CANON CITY, CO · 34,800 people · Surface Water CLIFTON WD CLIFTON, CO · 34,500 people · Surface Water DURANGO CITY OF DURANGO, CO · 33,787 people · Surface Water ASPEN CITY OF ASPEN, CO · 31,100 people · Surface Water ARAPAHOE CNTY WWWA CENTENNIAL, CO · 31,000 people · Groundwater BEAR CREEK WSD LAKEWOOD, CO · 30,000 people · Surface Water Purchased PUEBLO WEST MD PUEBLO WEST, CO · 30,000 people · Surface Water CHEROKEE MD COLORADO SPRINGS, CO · 29,610 people · Groundwater LAFAYETTE CITY OF LAFAYETTE, CO · 28,700 people · Surface Water BRECKENRIDGE TOWN OF BRECKENRIDGE, CO · 28,315 people · Surface Water EAST LARIMER COUNTY WD FORT COLLINS, CO · 27,944 people · Surface Water Purchased FIRESTONE TOWN OF FIRESTONE, CO · 27,798 people · Surface Water Purchased WIDEFIELD WSD COLORADO SPRINGS, CO · 27,640 people · Surface Water Purchased CSU MAIN AND WEST HOUSING CAMPUS FORT COLLINS, CO · 27,375 people · Surface Water Purchased JOHNSTOWN TOWN OF JOHNSTOWN, CO · 27,295 people · Surface Water GRAND JUNCTION CITY OF GRAND JUNCTION, CO · 26,000 people · Surface Water LITTLE THOMPSON WD BERTHOUD, CO · 25,654 people · Surface Water Purchased FOUNTAIN CITY OF FOUNTAIN, CO · 25,130 people · Surface Water Purchased CRESTVIEW WSD DENVER, CO · 23,756 people · Surface Water Purchased WINDSOR TOWN OF WINDSOR, CO · 23,500 people · Surface Water Purchased MERIDIAN MD ENGLEWOOD, CO · 23,415 people · Surface Water Purchased CHERRY CREEK VALLEY WSD DENVER, CO · 22,000 people · Surface Water Purchased LOUISVILLE CITY OF LOUISVILLE, CO · 20,975 people · Surface Water TRI COUNTY WCD MONTROSE, CO · 20,490 people · Surface Water Purchased LEFT HAND WD NIWOT, CO · 20,280 people · Surface Water SECURITY WATER DISTRICT COLORADO SPRINGS, CO · 20,000 people · Surface Water Purchased WHEAT RIDGE WATER DISTRICT WHEAT RIDGE, CO · 20,000 people · Surface Water Purchased PLATTE CANYON WSD LITTLETON, CO · 19,485 people · Surface Water Purchased EVANS CITY OF EVANS, CO · 19,369 people · Surface Water Purchased MONTROSE CITY OF MONTROSE, CO · 19,305 people · Surface Water Purchased WILLOWS WD CENTENNIAL, CO · 19,000 people · Surface Water Purchased MT WERNER WD STEAMBOAT SPRINGS, CO · 19,000 people · Surface Water WOODMOOR WSD MONUMENT, CO · 18,031 people · Surface Water SUPERIOR MD NO 1 SUPERIOR, CO · 17,900 people · Surface Water FREDERICK TOWN OF FREDERICK, CO · 17,173 people · Surface Water Purchased US AIR FORCE ACADEMY USAF ACADEMY, CO · 16,876 people · Surface Water Purchased ESTES PARK TOWN OF ESTES PARK, CO · 16,722 people · Surface Water NORTH WELD COUNTY WD LUCERNE, CO · 15,890 people · Surface Water Purchased EVERGREEN MD EVERGREEN, CO · 15,750 people · Surface Water STONEGATE MD PARKER, CO · 15,295 people · Surface Water Purchased GYPSUM TOWN OF GYPSUM, CO · 15,272 people · Surface Water BLACK HAWK CITY OF BLACK HAWK, CO · 15,167 people · Surface Water STERLING CITY OF STERLING, CO · 15,100 people · GWUDI NORTH WASHINGTON STREET WSD DENVER, CO · 14,500 people · Surface Water Purchased BERTHOUD TOWN OF BERTHOUD, CO · 14,211 people · Surface Water WOODMEN HILLS MD FALCON, CO · 13,888 people · Groundwater MONTEZUMA WC DOLORES, CO · 13,797 people · Surface Water ROXBOROUGH WSD LITTLETON, CO · 13,765 people · Surface Water PINERY WWD PARKER, CO · 12,901 people · Surface Water Purchased CASTLE PINES NORTH MD CASTLE PINES, CO · 12,800 people · Surface Water Purchased MERIDIAN SERVICE MD PEYTON, CO · 12,760 people · Groundwater FT LUPTON CITY OF FORT LUPTON, CO · 12,099 people · Surface Water KEN CARYL WSD LITTLETON, CO · 12,000 people · Surface Water Purchased LAKEHURST WSD LITTLETON, CO · 12,000 people · Surface Water Purchased FT MORGAN CITY OF FORT MORGAN, CO · 12,000 people · Surface Water SEVERANCE TOWN OF SEVERANCE, CO · 11,733 people · Surface Water Purchased WELLINGTON TOWN OF WELLINGTON, CO · 11,720 people · Surface Water FEDERAL HEIGHTS CITY OF FEDERAL HEIGHTS, CO · 11,678 people · Surface Water Purchased TRINIDAD CITY OF TRINIDAD, CO · 11,400 people · Surface Water STERLING RANCH CAB LITTLETON, CO · 11,357 people · Surface Water Purchased ALAMOSA CITY OF ALAMOSA, CO · 11,271 people · Groundwater PAGOSA AREA WSD PAGOSA SPRINGS, CO · 11,069 people · Surface Water COTTONWOOD WSD ENGLEWOOD, CO · 10,867 people · Surface Water Purchased IDAHO SPRINGS CITY OF IDAHO SPRINGS, CO · 10,432 people · Surface Water NORTH TABLE MOUNTAIN WSD GOLDEN, CO · 10,000 people · Surface Water VALLEY WD WHEAT RIDGE, CO · 10,000 people · Surface Water Purchased STEAMBOAT SPRINGS CITY OF STEAMBOAT SPRINGS, CO · 9,950 people · Surface Water Purchased SNAKE RIVER WD KEYSTONE, CO · 9,900 people · Groundwater MORRISON TOWN OF MORRISON, CO · 9,887 people · Surface Water MOUNTAIN VILLAGE TOWN OF REDVALE, CO · 9,700 people · Groundwater ST CHARLES MESA WD PUEBLO, CO · 9,690 people · Surface Water GUNNISON CITY OF GUNNISON, CO · 9,610 people · Groundwater RIFLE CITY OF RIFLE, CO · 9,489 people · Surface Water GLENWOOD SPRINGS CITY OF GLENWOOD SPRINGS, CO · 9,428 people · Surface Water WILLOWBROOK WSD LAKEWOOD, CO · 9,348 people · Surface Water Purchased CHERRY CREEK VILLAGE WD GREENWOOD VILLAGE, CO · 9,215 people · Surface Water Purchased MILLIKEN TOWN OF MILLIKEN, CO · 9,200 people · Surface Water Purchased CRAIG CITY OF CRAIG, CO · 8,930 people · Surface Water CORTEZ CITY OF CORTEZ, CO · 8,770 people · Surface Water DELTA CITY OF DELTA, CO · 8,700 people · Surface Water Purchased WOODLAND PARK CITY OF WOODLAND, CO · 8,500 people · Surface Water SILVERTHORNE TOWN OF SILVERTHORNE, CO · 8,414 people · Groundwater LA JUNTA CITY OF LA JUNTA, CO · 8,320 people · Groundwater INVERNESS WSD ENGLEWOOD, CO · 8,140 people · Surface Water Purchased MORGAN COUNTY QUALITY WD FORT MORGAN, CO · 8,116 people · Surface Water Purchased TELLURIDE TOWN OF TELLURIDE, CO · 7,900 people · Surface Water CENTRAL WELD CNTY WD GREELEY, CO · 7,662 people · Surface Water Purchased EAGLE TOWN OF EAGLE, CO · 7,511 people · Surface Water FLORENCE CITY OF FLORENCE, CO · 7,500 people · Surface Water PARKVILLE WD LEADVILLE, CO · 7,500 people · Surface Water LAMAR CITY OF LAMAR, CO · 7,500 people · Groundwater EATON TOWN OF EATON, CO · 7,328 people · Surface Water Purchased TODD CREEK VILLAGE MD BRIGHTON, CO · 7,202 people · GWUDI MANITOU SPRINGS CITY OF MANITOU SPRINGS, CO · 6,938 people · Surface Water DACONO CITY OF DACONO, CO · 6,900 people · Surface Water Purchased CARBONDALE TOWN OF CARBONDALE, CO · 6,700 people · Surface Water WINTER PARK WSD WINTER PARK, CO · 6,635 people · Surface Water LOCHBUIE TOWN OF LOCHBUIE, CO · 6,518 people · Groundwater STRATMOOR HILLS WSD COLORADO SPRINGS, CO · 6,500 people · Surface Water Purchased DONALA WSD COLORADO SPRINGS, CO · 6,421 people · Surface Water Purchased SNOWMASS VILLAGE WSD SNOWMASS VILLAGE, CO · 6,353 people · Surface Water NORTHERN DOUGLAS COUNTY WSD GREENWOOD VILLAGE, CO · 6,160 people · Surface Water Purchased LAKEWOOD CITY OF LAKEWOOD, CO · 6,000 people · Surface Water Purchased COPPER MOUNTAIN CONSOLIDATED MD COPPER MOUNTAIN, CO · 5,785 people · Groundwater MONUMENT TOWN OF MONUMENT, CO · 5,740 people · Groundwater TRIVIEW MD MONUMENT, CO · 5,737 people · Surface Water Purchased SALIDA CITY OF SALIDA, CO · 5,666 people · Surface Water CASTLE PINES VILLAGE MD CASTLE ROCK, CO · 5,656 people · Groundwater GRAND COUNTY WATER NO 1 WINTER PARK, CO · 5,400 people · Surface Water GEORGETOWN TOWN OF GEORGETOWN, CO · 5,315 people · Surface Water EDGEWATER CITY OF EDGEWATER, CO · 5,300 people · Surface Water Purchased BRUSH CITY OF HILLROSE, CO · 5,122 people · Groundwater LIMON TOWN OF LIMON, CO · 5,080 people · Groundwater NEW CASTLE TOWN OF NEW CASTLE, CO · 5,024 people · Surface Water PAINT BRUSH HILLS FALCON, CO · 4,994 people · Groundwater NORTHERN COLORADO WA WELLINGTON, CO · 4,675 people · Surface Water Purchased KEENESBURG TOWN OF KEENESBURG, CO · 4,650 people · Groundwater MONTE VISTA CITY OF MONTE VISTA, CO · 4,600 people · Groundwater MID VALLEY MD BASALT, CO · 4,588 people · Groundwater ELIZABETH TOWN OF ELIZABETH, CO · 4,523 people · Groundwater MENOKEN WD MONTROSE, CO · 4,500 people · Surface Water Purchased FRISCO TOWN OF FRISCO, CO · 4,495 people · Surface Water ROCKY FORD CITY OF ROCKY FORD, CO · 4,443 people · Groundwater BENNETT TOWN OF BENNETT, CO · 4,400 people · Groundwater GLENDALE CITY OF GLENDALE, CO · 4,400 people · Surface Water Purchased AULT TOWN OF AULT, CO · 4,220 people · Surface Water Purchased BATTLEMENT MESA MD ADMINISTRATIVE CONTACT, CO · 4,100 people · Surface Water YUMA CITY OF YUMA, CO · 4,049 people · Groundwater PARK CENTER WD CANON CITY, CO · 4,000 people · Surface Water HIGH VIEW WD LAKEWOOD, CO · 4,000 people · Surface Water Purchased WEST FORT COLLINS WD LA PORTE, CO · 4,000 people · Surface Water Purchased HAYDEN TOWN OF HAYDEN, CO · 3,982 people · Surface Water GENESEE WSD GOLDEN, CO · 3,920 people · Surface Water PERRY PARK WSD LARKSPUR, CO · 3,890 people · GWUDI CHIPETA WD MONTROSE, CO · 3,802 people · Surface Water Purchased BUENA VISTA TOWN OF BUENA VISTA, CO · 3,776 people · GWUDI CENTRAL CITY CITY OF CENTRAL CITY, CO · 3,750 people · Surface Water YMCA ROCKIES WIND RIVER ESTES PARK, CO · 3,730 people · Surface Water Purchased BURLINGTON CITY OF BURLINGTON, CO · 3,720 people · Groundwater COLORADO CENTRE MD COLORADO SPRINGS, CO · 3,675 people · Groundwater SILT TOWN OF SILT, CO · 3,536 people · Surface Water ADVENIR FRENCH QUARTER DENVER, CO · 3,447 people · Surface Water Purchased HUDSON TOWN OF HUDSON, CO · 3,350 people · Surface Water Purchased MOUNT CRESTED BUTTE WSD MOUNT CRESTED BUTTE, CO · 3,296 people · Surface Water MEADOWBROOK WD LAKEWOOD, CO · 3,290 people · Surface Water Purchased DILLON TOWN OF DILLON, CO · 3,254 people · Surface Water WINTER PARK RANCH WSD FRASER, CO · 3,250 people · Groundwater WALSENBURG CITY OF WALSENBURG, CO · 3,230 people · Surface Water LONGS PEAK WD LONGMONT, CO · 3,200 people · Surface Water PENROSE WD PENROSE, CO · 3,149 people · Surface Water ORCHARD CITY TOWN OF AUSTIN, CO · 3,100 people · GWUDI ANIMAS WC DURANGO, CO · 3,096 people · Groundwater DILLON VALLEY DISTRICT DILLON, CO · 3,063 people · Surface Water PALISADE TOWN OF PALISADE, CO · 3,060 people · Surface Water OLATHE TOWN OF OLATHE, CO · 3,015 people · Surface Water Purchased LYONS TOWN OF LYONS, CO · 2,990 people · Surface Water Purchased PLATTEVILLE TOWN OF PLATTEVILLE, CO · 2,900 people · Surface Water Purchased CRIPPLE CREEK CITY OF CRIPPLE CREEK, CO · 2,817 people · Surface Water UPPER SURFACE CREEK DOMESTIC WUA CEDAREDGE, CO · 2,800 people · Surface Water COLORADO CITY MD COLORADO CITY, CO · 2,755 people · Surface Water PALMER LAKE TOWN OF PALMER LAKE, CO · 2,686 people · Surface Water BUFFALO MOUNTAIN MD SILVERTHORNE, CO · 2,650 people · Groundwater CENTER TOWN OF CENTER, CO · 2,575 people · Groundwater HOLYOKE CITY OF HOLYOKE, CO · 2,540 people · Groundwater EAST DILLON WD DILLON, CO · 2,501 people · GWUDI WIKIUP MHP LAKEWOOD, CO · 2,500 people · Groundwater NORTH PECOS WSD DENVER, CO · 2,500 people · Surface Water Purchased SOUTH SHERIDAN WATER AND SEWER DIST GREENWOOD VILLAGE, CO · 2,500 people · Surface Water Purchased PAONIA TOWN OF PAONIA, CO · 2,499 people · GWUDI RANGELY TOWN OF RANGELY, CO · 2,495 people · Surface Water RANGEVIEW MD WATKINS, CO · 2,487 people · Surface Water Purchased EASTERN ADAMS CO MD DENVER, CO · 2,485 people · Groundwater ALAMEDA WSD LAKEWOOD, CO · 2,480 people · Surface Water Purchased MEEKER TOWN OF MEEKER, CO · 2,473 people · Groundwater CRESTED BUTTE TOWN OF CRESTED BUTTE, CO · 2,440 people · Surface Water NEDERLAND TOWN OF NEDERLAND, CO · 2,406 people · Surface Water CEDAREDGE TOWN OF CEDAREDGE, CO · 2,400 people · Surface Water SILVERTON TOWN OF SILVERTON, CO · 2,387 people · Surface Water AKRON TOWN OF AKRON, CO · 2,379 people · Groundwater BASALT TOWN OF BASALT, CO · 2,357 people · GWUDI WRAY CITY OF WRAY, CO · 2,342 people · Groundwater SPRING CANYON WSD FORT COLLINS, CO · 2,320 people · Surface Water Purchased GRANBY TOWN OF SOUTH SERVICE AREA GRANBY, CO · 2,300 people · GWUDI BAYFIELD TOWN OF BAYFIELD, CO · 2,300 people · Surface Water FLAGLER TOWN OF FLAGLER, CO · 2,160 people · Groundwater FRASER TOWN OF FRASER, CO · 2,150 people · Groundwater LAS ANIMAS CITY OF LAS ANIMAS, CO · 2,139 people · Groundwater KERSEY WD KERSEY, CO · 2,101 people · Surface Water Purchased STRASBURG WSD STRASBURG, CO · 2,050 people · Groundwater HOTCHKISS TOWN OF HOTCHKISS, CO · 2,050 people · Surface Water GRAND LAKE TOWN OF GRAND LAKE, CO · 2,035 people · Groundwater GRANBY TOWN OF NORTH SERVICE AREA GRANBY, CO · 2,025 people · Surface Water LA SALLE TOWN OF LASALLE, CO · 2,010 people · Surface Water Purchased BACA GRANDE WSD CRESTONE, CO · 2,006 people · Groundwater KIMBERLY HILLS MHP LAKEWOOD, CO · 2,005 people · Surface Water Purchased CRESTED BUTTE SOUTH CRESTED BUTTE, CO · 2,000 people · Groundwater CREEDE CITY OF CREEDE, CO · 1,965 people · Groundwater EL JEBEL MHP EL JEBEL, CO · 1,962 people · GWUDI ROUND MOUNTAIN WSD WESTCLIFFE, CO · 1,950 people · Groundwater MOUNTAIN WSD CONIFER, CO · 1,941 people · GWUDI ROARING FORK WSD GLENWOOD SPRINGS, CO · 1,912 people · Groundwater WIGGINS TOWN OF WIGGINS, CO · 1,909 people · Groundwater PINE LAKES RANCH LAKEWOOD, CO · 1,905 people · Surface Water Purchased KREMMLING TOWN OF KREMMLING, CO · 1,859 people · Surface Water SPRING VALLEY MD NO 1 LAKEWOOD, CO · 1,788 people · Groundwater FRIENDLY VILLAGE OF AURORA MHP LAKEWOOD, CO · 1,786 people · Surface Water Purchased WOODLAND HILLS MHC THORNTON, CO · 1,740 people · Surface Water Purchased TIMBER RIDGE MHP FORT COLLINS, CO · 1,736 people · Surface Water Purchased ARISTOCRAT RANCHETTE WATER PROJECT FORT LUPTON, CO · 1,715 people · Surface Water Purchased BUENA VISTA CORRECTIONAL FACILITY BUENA VISTA, CO · 1,700 people · Groundwater NORWOOD WATER COMMISSION NORWOOD, CO · 1,700 people · Surface Water FOREST LAKES MD BAYFIELD, CO · 1,699 people · Groundwater BOULDER MEADOWS MHP WINDSOR, CO · 1,657 people · Surface Water Purchased DEER TRAIL TOWN OF DEER TRAIL, CO · 1,648 people · Groundwater DOLORES TOWN OF DOLORES, CO · 1,626 people · Surface Water FRONT RANGE BROOMFIELD, CO · 1,620 people · Surface Water Purchased AVONDALE WSD PUEBLO, CO · 1,615 people · Groundwater RALSTON VALLEY WSD ARVADA, CO · 1,610 people · Surface Water Purchased

Colorado Drinking Water: Frequently Asked Questions

Is Colorado tap water safe to drink?

Colorado has 1,046 community water systems regulated by the EPA serving a combined 7,184,013 people. Water quality varies by system — search above to find your specific utility and see its violation history, lead test results, and safety grade.

How many water systems are in Colorado?

There are 1,046 EPA-regulated community water systems in Colorado serving a combined 7,184,013 people. Each system is required to test for over 90 contaminants and publicly report any violations.

Does Colorado have PFAS in its drinking water?

PFAS (forever chemicals) have been detected in water systems across the country, including Colorado. The EPA finalized enforceable PFAS limits in 2024. Search for your specific water system above to see if PFAS were detected and whether levels exceed the new federal limits.

EPA data last updated: 2026-07-12