Systems with a yearly average above an EPA comparison level
2.6%4 of 155 active community water systems
All 155 systems met the sampling requirement for a yearly average. Of those systems, 4 had at least one yearly average above an EPA comparison level and 151 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. Colorado may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official Colorado drinking-water program →
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Find your water system
A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the provider using a water bill or utility record.
Compound summary
System counts in Colorado
Each count shows how many included water systems had a yearly average above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 1 | 155 | 0.6% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 4 | 155 | 2.6% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 1 | 155 | 0.6% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 155 | 0.0% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 155 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 1 | 155 | 0.6% |
System directory
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| ADVENIR FRENCH QUARTER | CO0116104 | 3,447 | Surface water purchased | 1 | No available average above comparison levels |
| ALAMOSA CITY OF | CO0102100 | 11,271 | Ground water | 1 | No available average above comparison levels |
| ANTONITO TOWN OF | CO0111100 | 981 | Groundwater under influence of surface water | 1 | No available average above comparison levels |
| ARAPAHOE CNTY WWWA | CO0203002 | 31,000 | Ground water | 7 | No available average above comparison levels |
| ARVADA CITY OF | CO0130001 | 171,610 | Surface water | 2 | No available average above comparison levels |
| ASPEN CITY OF | CO0149122 | 31,100 | Surface water | 1 | No available average above comparison levels |
| AURORA CITY OF | CO0103005 | 533,407 | Surface water | 3 | No available average above comparison levels |
| BATTLEMENT MESA MD | CO0123133 | 4,100 | Surface water | 1 | No available average above comparison levels |
| BERTHOUD TOWN OF | CO0135138 | 14,211 | Surface water | 1 | No available average above comparison levels |
| BLACK HAWK CITY OF | CO0124147 | 15,167 | Surface water | 2 | No available average above comparison levels |
| BOULDER CITY OF | CO0107152 | 166,080 | Surface water | 2 | No available average above comparison levels |
| BRECKENRIDGE TOWN OF | CO0159020 | 28,315 | Surface water | 1 | No available average above comparison levels |
| BRIGHTON CITY OF | CO0101025 | 56,304 | Surface water purchased | 4 | Above an EPA comparison level |
| BROOMFIELD CITY AND COUNTY OF | CO0107155 | 106,153 | Surface water | 1 | No available average above comparison levels |
| BRUSH CITY OF | CO0144001 | 5,122 | Ground water | 1 | No available average above comparison levels |
| BUENA VISTA TOWN OF | CO0108300 | 3,776 | Groundwater under influence of surface water | 2 | No available average above comparison levels |
| BURLINGTON CITY OF | CO0132005 | 3,720 | Ground water | 2 | No available average above comparison levels |
| CANON CITY CITY OF | CO0122100 | 34,800 | Surface water | 1 | No available average above comparison levels |
| CARBONDALE TOWN OF | CO0123167 | 6,700 | Surface water | 3 | No available average above comparison levels |
| CASTLE PINES VILLAGE MD | CO0118005 | 5,656 | Ground water | 2 | No available average above comparison levels |
| CASTLE ROCK TOWN OF | CO0118010 | 110,298 | Surface water | 5 | No available average above comparison levels |
| CENTENNIAL WSD | CO0118015 | 103,444 | Surface water | 3 | No available average above comparison levels |
| CENTRAL CITY CITY OF | CO0124171 | 3,750 | Surface water | 1 | No available average above comparison levels |
| CENTRAL WELD CNTY WD | CO0162122 | 7,662 | Surface water purchased | 1 | No available average above comparison levels |
| CHEROKEE MD | CO0121125 | 29,610 | Ground water | 3 | No available average above comparison levels |
| CHIPETA WD | CO0143176 | 3,802 | Surface water purchased | 1 | No available average above comparison levels |
| CLIFTON WD | CO0139180 | 34,500 | Surface water | 1 | No available average above comparison levels |
| COLORADO CENTRE MD | CO0121140 | 3,675 | Ground water | 1 | No available average above comparison levels |
| COLORADO SPRINGS UTILITIES | CO0121150 | 464,111 | Surface water | 6 | No available average above comparison levels |
| CONSOLIDATED MUTUAL MAPLE GROVE | CO0130020 | 81,400 | Surface water | 1 | No available average above comparison levels |
| COPPER MOUNTAIN CONSOLIDATED MD | CO0159030 | 5,785 | Ground water | 2 | No available average above comparison levels |
| COTTONWOOD WSD | CO0118020 | 10,867 | Surface water purchased | 2 | No available average above comparison levels |
| CRAIG CITY OF | CO0141188 | 8,930 | Surface water | 1 | No available average above comparison levels |
| CRAWFORD MESA WA | CO0115189 | 486 | Ground water | 1 | No available average above comparison levels |
| CREEDE CITY OF | CO0140500 | 1,965 | Ground water | 1 | No available average above comparison levels |
| CSU MAIN AND WEST HOUSING CAMPUS | CO0235184 | 27,375 | Surface water purchased | 1 | No available average above comparison levels |
| DACONO CITY OF | CO0162200 | 6,900 | Surface water purchased | 1 | No available average above comparison levels |
| DELTA CITY OF | CO0115205 | 8,700 | Surface water purchased | 1 | No available average above comparison levels |
| DENVER WATER BOARD | CO0116001 | 1,287,000 | Surface water | 4 | No available average above comparison levels |
| DOLORES TOWN OF | CO0142400 | 1,626 | Surface water | 1 | No available average above comparison levels |
| DONALA WSD | CO0121175 | 6,421 | Surface water purchased | 3 | No available average above comparison levels |
| DURANGO CITY OF | CO0134150 | 33,787 | Surface water | 1 | No available average above comparison levels |
| EAGLE RIVER WSD | CO0119802 | 51,515 | Surface water | 11 | No available average above comparison levels |
| EAGLE TOWN OF | CO0119233 | 7,511 | Surface water | 2 | No available average above comparison levels |
| EAST CHERRY CREEK VALLEY WSD | CO0103035 | 66,130 | Surface water purchased | 4 | No available average above comparison levels |
| EAST LARIMER COUNTY WD | CO0135233 | 27,944 | Surface water purchased | 1 | No available average above comparison levels |
| EATON TOWN OF | CO0162233 | 7,328 | Surface water purchased | 1 | No available average above comparison levels |
| ENGLEWOOD CITY OF | CO0103045 | 57,332 | Surface water | 1 | No available average above comparison levels |
| ERIE TOWN OF | CO0162255 | 47,444 | Surface water | 1 | No available average above comparison levels |
| ESTES PARK TOWN OF | CO0135257 | 16,722 | Surface water | 2 | No available average above comparison levels |
| EVANS CITY OF | CO0162260 | 19,369 | Surface water purchased | 1 | No available average above comparison levels |
| EVERGREEN MD | CO0130030 | 15,750 | Surface water | 1 | No available average above comparison levels |
| FEDERAL HEIGHTS CITY OF | CO0101055 | 11,678 | Surface water purchased | 2 | No available average above comparison levels |
| FIRESTONE TOWN OF | CO0162476 | 27,798 | Surface water purchased | 1 | No available average above comparison levels |
| FLORENCE CITY OF | CO0122500 | 7,500 | Surface water | 1 | No available average above comparison levels |
| FOUNTAIN CITY OF | CO0121275 | 25,130 | Surface water purchased | 4 | No available average above comparison levels |
| FREDERICK TOWN OF | CO0162288 | 17,173 | Surface water purchased | 1 | No available average above comparison levels |
| FRISCO TOWN OF | CO0159055 | 4,495 | Surface water | 3 | No available average above comparison levels |
| FT COLLINS CITY OF | CO0135291 | 179,901 | Surface water | 1 | No available average above comparison levels |
| FT COLLINS LOVELAND WD | CO0135292 | 63,532 | Surface water purchased | 2 | No available average above comparison levels |
| FT LUPTON CITY OF | CO0162291 | 12,099 | Surface water | 1 | No available average above comparison levels |
| FT MORGAN CITY OF | CO0144005 | 12,000 | Surface water | 1 | No available average above comparison levels |
| GENESEE WSD | CO0130035 | 3,920 | Surface water | 1 | No available average above comparison levels |
| GLENWOOD SPRINGS CITY OF | CO0123314 | 9,428 | Surface water | 1 | No available average above comparison levels |
| GOLDEN CITY OF | CO0130040 | 38,288 | Surface water | 1 | No available average above comparison levels |
| GOLDEN TERRACE WEST | CO0130319 | 825 | Surface water purchased | 1 | No available average above comparison levels |
| GRAND COUNTY WATER NO 1 | CO0125323 | 5,400 | Surface water | 2 | No available average above comparison levels |
| GRAND JUNCTION CITY OF | CO0139321 | 26,000 | Surface water | 1 | No available average above comparison levels |
| GREELEY CITY OF | CO0162321 | 132,310 | Surface water | 2 | No available average above comparison levels |
| GUNNISON CITY OF | CO0126325 | 9,610 | Ground water | 9 | No available average above comparison levels |
| GYPSUM TOWN OF | CO0119329 | 15,272 | Surface water | 2 | No available average above comparison levels |
| HAYDEN TOWN OF | CO0154333 | 3,982 | Surface water | 1 | No available average above comparison levels |
| HUDSON TOWN OF | CO0162359 | 3,350 | Surface water purchased | 1 | No available average above comparison levels |
| IDAHO SPRINGS CITY OF | CO0110020 | 10,432 | Surface water | 1 | No available average above comparison levels |
| INVERNESS WSD | CO0203012 | 8,140 | Surface water purchased | 6 | No available average above comparison levels |
| JOHNSTOWN TOWN OF | CO0162418 | 27,295 | Surface water | 1 | No available average above comparison levels |
| LA JUNTA CITY OF | CO0145420 | 8,320 | Ground water | 1 | No available average above comparison levels |
| LAFAYETTE CITY OF | CO0107473 | 28,700 | Surface water | 2 | No available average above comparison levels |
| LAMAR CITY OF | CO0150700 | 7,500 | Ground water | 1 | No available average above comparison levels |
| LEFT HAND WD | CO0107471 | 20,280 | Surface water | 2 | No available average above comparison levels |
| LIMON TOWN OF | CO0137015 | 5,080 | Ground water | 1 | No available average above comparison levels |
| LITTLE THOMPSON WD | CO0135477 | 25,654 | Surface water purchased | 1 | No available average above comparison levels |
| LOCHBUIE TOWN OF | CO0162486 | 6,518 | Ground water | 1 | No available average above comparison levels |
| LONGMONT CITY OF | CO0107485 | 104,178 | Surface water | 1 | No available average above comparison levels |
| LOUISVILLE CITY OF | CO0107487 | 20,975 | Surface water | 2 | No available average above comparison levels |
| LOVELAND CITY OF | CO0135485 | 91,077 | Surface water | 2 | No available average above comparison levels |
| MANITOU SPRINGS CITY OF | CO0121450 | 6,938 | Surface water | 1 | No available average above comparison levels |
| MENOKEN WD | CO0143506 | 4,500 | Surface water purchased | 1 | No available average above comparison levels |
| MERIDIAN MD | CO0218015 | 23,415 | Surface water purchased | 3 | No available average above comparison levels |
| MERIDIAN SERVICE MD | CO0121455 | 12,760 | Ground water | 1 | No available average above comparison levels |
| MID VALLEY MD | CO0119508 | 4,588 | Ground water | 3 | No available average above comparison levels |
| MILLIKEN TOWN OF | CO0162511 | 9,200 | Surface water purchased | 2 | No available average above comparison levels |
| MONTE VISTA CITY OF | CO0153600 | 4,600 | Ground water | 3 | No available average above comparison levels |
| MONTEZUMA WC | CO0142900 | 13,797 | Surface water | 1 | No available average above comparison levels |
| MONTROSE CITY OF | CO0143518 | 19,305 | Surface water purchased | 1 | No available average above comparison levels |
| MONUMENT TOWN OF | CO0121475 | 5,740 | Ground water | 6 | No available average above comparison levels |
| MORGAN COUNTY QUALITY WD | CO0144020 | 8,116 | Surface water purchased | 3 | No available average above comparison levels |
| MORRISON TOWN OF | CO0130085 | 9,887 | Surface water | 1 | No available average above comparison levels |
| MOUNTAIN VILLAGE TOWN OF | CO0157400 | 9,700 | Ground water | 4 | No available average above comparison levels |
| MT WERNER WD | CO0154524 | 19,000 | Surface water | 2 | No available average above comparison levels |
| NAVAJO RIVER RANCH POA | CO0104533 | 40 | Groundwater under influence of surface water | 1 | No available average above comparison levels |
| NEW CASTLE TOWN OF | CO0123538 | 5,024 | Surface water | 1 | No available average above comparison levels |
| NORTH TABLE MOUNTAIN WSD | CO0130105 | 10,000 | Surface water | 1 | No available average above comparison levels |
| NORTH WELD COUNTY WD | CO0162553 | 15,890 | Surface water purchased | 2 | No available average above comparison levels |
| NORTHERN COLORADO WA | CO0135554 | 4,675 | Surface water purchased | 3 | No available average above comparison levels |
| NORTHERN DOUGLAS COUNTY WSD | CO0118016 | 6,160 | Surface water purchased | 1 | No available average above comparison levels |
| NORTHGLENN CITY OF | CO0101115 | 48,927 | Surface water | 1 | No available average above comparison levels |
| PAGOSA AREA WSD | CO0104300 | 11,069 | Surface water | 3 | No available average above comparison levels |
| PAINT BRUSH HILLS | CO0221690 | 4,994 | Ground water | 2 | No available average above comparison levels |
| PARK CENTER WD | CO0122600 | 4,000 | Surface water | 1 | No available average above comparison levels |
| PARKER WSD | CO0118040 | 75,949 | Surface water | 11 | No available average above comparison levels |
| PARKVILLE WD | CO0133700 | 7,500 | Surface water | 2 | No available average above comparison levels |
| PATTERSON VALLEY WC | CO0145540 | 96 | Ground water | 1 | No available average above comparison levels |
| PERRY PARK WSD | CO0118045 | 3,890 | Groundwater under influence of surface water | 3 | No available average above comparison levels |
| PINERY WWD | CO0118025 | 12,901 | Surface water purchased | 6 | No available average above comparison levels |
| PUEBLO BOARD OF WW | CO0151500 | 114,070 | Surface water | 1 | No available average above comparison levels |
| PUEBLO WEST MD | CO0151650 | 30,000 | Surface water | 3 | No available average above comparison levels |
| RIFLE CITY OF | CO0123676 | 9,489 | Surface water | 1 | No available average above comparison levels |
| ROCKY FORD CITY OF | CO0145600 | 4,443 | Ground water | 1 | No available average above comparison levels |
| ROXBOROUGH WSD | CO0118055 | 13,765 | Surface water | 1 | No available average above comparison levels |
| SALIDA CITY OF | CO0108700 | 5,666 | Surface water | 3 | No available average above comparison levels |
| SECURITY WSD | CO0121775 | 20,000 | Surface water purchased | 3 | No available average above comparison levels |
| SEVERANCE TOWN OF | CO0162707 | 11,733 | Surface water purchased | 1 | No available average above comparison levels |
| SILVERTHORNE TOWN OF | CO0159095 | 8,400 | Ground water | 4 | No available average above comparison levels |
| SNAKE RIVER WD | CO0159105 | 9,900 | Ground water | 2 | Above an EPA comparison level |
| SNOWMASS VILLAGE WSD | CO0149717 | 6,353 | Surface water | 1 | No available average above comparison levels |
| SOUTH ADAMS COUNTY WSD | CO0101140 | 75,559 | Surface water purchased | 5 | No available average above comparison levels |
| ST CHARLES MESA WD | CO0151750 | 9,690 | Surface water | 2 | No available average above comparison levels |
| STEAMBOAT SPRINGS CITY OF | CO0154725 | 9,950 | Surface water purchased | 1 | No available average above comparison levels |
| STERLING CITY OF | CO0138045 | 15,100 | Groundwater under influence of surface water | 1 | No available average above comparison levels |
| STONEGATE MD | CO0118076 | 15,295 | Surface water purchased | 1 | No available average above comparison levels |
| STRATMOOR HILLS WSD | CO0121800 | 6,500 | Surface water purchased | 1 | No available average above comparison levels |
| SUPERIOR MD NO 1 | CO0107725 | 17,900 | Surface water | 1 | No available average above comparison levels |
| TELLURIDE TOWN OF | CO0157800 | 7,900 | Surface water | 2 | No available average above comparison levels |
| THORNTON CITY OF | CO0101150 | 226,465 | Surface water | 2 | No available average above comparison levels |
| TODD CREEK VILLAGE MD | CO0101157 | 7,363 | Groundwater under influence of surface water | 1 | Above an EPA comparison level |
| TRI COUNTY WCD | CO0143755 | 20,490 | Surface water purchased | 1 | No available average above comparison levels |
| TRINIDAD CITY OF | CO0136800 | 11,400 | Surface water | 1 | No available average above comparison levels |
| TRIVIEW MD | CO0121840 | 5,737 | Surface water purchased | 1 | No available average above comparison levels |
| TWO RIVERS VILLAGE | CO0119720 | 896 | Ground water | 1 | No available average above comparison levels |
| US AIR FORCE ACADEMY | CO0121845 | 16,876 | Surface water purchased | 1 | No available average above comparison levels |
| US DEPARTMENT OF THE ARMY FORT CARSON | CO0221445 | 48,000 | Surface water purchased | 1 | No available average above comparison levels |
| UTE WCD | CO0139791 | 92,580 | Surface water | 1 | No available average above comparison levels |
| WELLINGTON TOWN OF | CO0135838 | 11,720 | Surface water | 2 | No available average above comparison levels |
| WEST FORT COLLINS WD | CO0135290 | 4,000 | Surface water purchased | 1 | No available average above comparison levels |
| WESTMINSTER CITY OF | CO0101170 | 202,078 | Surface water | 2 | No available average above comparison levels |
| WIDEFIELD WSD | CO0121900 | 27,640 | Surface water purchased | 9 | Above an EPA comparison level |
| WINDSOR TOWN OF | CO0162843 | 23,500 | Surface water purchased | 3 | No available average above comparison levels |
| WINTER PARK WSD | CO0125843 | 6,635 | Surface water | 1 | No available average above comparison levels |
| WOODLAND PARK CITY OF | CO0160900 | 8,500 | Surface water | 1 | No available average above comparison levels |
| WOODMEN HILLS MD | CO0121930 | 13,888 | Ground water | 3 | No available average above comparison levels |
| WOODMOOR WSD | CO0121950 | 18,031 | Surface water | 5 | No available average above comparison levels |
| YMCA ROCKIES WIND RIVER | CO0135883 | 3,730 | Surface water purchased | 1 | No available average above comparison levels |
| YMCA SNOW MTN RANCH | CO0125916 | 578 | Groundwater under influence of surface water | 1 | No available average above comparison levels |
| YUMA CITY OF | CO0163020 | 4,049 | Ground water | 6 | No available average above comparison levels |
How the count works
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system.