STATE / TERRITORY LEDGER
Colorado drinking water system records
EPA’s September 2026 export lists 200 active community water systems in Colorado, with 13 current-violation flags and 0 serious-violator flags among covered systems serving at least 2,500 people.
Source: EPA SDWIS system-search export · Active community systems · Snapshot 13 Sep 2026
Systems200active CWS · pop. 2,500+
Population served6,817,420reported total; may overlap
Current violation flag6.5%13 systems
Serious-violator flag0.0%0 systems
01 / LARGEST SYSTEMS
Colorado community water systems
EPA’s covered Colorado records include 200 active community systems reporting a combined population-served total of 6,817,420, which may overlap.
Population served is a system-reported service figure. It is not a count of unique state residents.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Denver Water BoardCO0116001 | 1,287,000 | Surface water | No current violation flagged |
| Aurora City OfCO0103005 | 533,407 | Surface water | No current violation flagged |
| Colorado Springs UtilitiesCO0121150 | 464,111 | Surface water | No current violation flagged |
| Thornton City OfCO0101150 | 226,465 | Surface water | No current violation flagged |
| Westminster City OfCO0101170 | 202,078 | Surface water | No current violation flagged |
| Ft Collins City OfCO0135291 | 179,901 | Surface water | No current violation flagged |
| Arvada City OfCO0130001 | 171,610 | Surface water | No current violation flagged |
| Boulder City OfCO0107152 | 166,080 | Surface water | No current violation flagged |
| Greeley City OfCO0162321 | 132,310 | Surface water | No current violation flagged |
| Pueblo Board Of WwCO0151500 | 114,070 | Surface water | No current violation flagged |
| Castle Rock Town OfCO0118010 | 110,298 | Surface water | No current violation flagged |
| Broomfield City And County OfCO0107155 | 106,153 | Surface water | No current violation flagged |
| Longmont City OfCO0107485 | 104,178 | Surface water | No current violation flagged |
| Highlands Ranch WsdCO0118015 | 103,444 | Surface water | No current violation flagged |
| Ute WcdCO0139791 | 92,580 | Surface water | No current violation flagged |
| Loveland City OfCO0135485 | 91,077 | Surface water | No current violation flagged |
| Consolidated Mutual Maple GroveCO0130020 | 81,400 | Surface water | No current violation flagged |
| Parker WsdCO0118040 | 75,949 | Surface water | No current violation flagged |
| South Adams County WsdCO0101140 | 75,559 | Surface water purchased | No current violation flagged |
| East Cherry Creek Valley WsdCO0103035 | 66,130 | Surface water purchased | No current violation flagged |
| Ft Collins Loveland WdCO0135292 | 63,532 | Surface water purchased | No current violation flagged |
| Englewood City OfCO0103045 | 57,332 | Surface water | No current violation flagged |
| Brighton City OfCO0101025 | 56,304 | Surface water purchased | No current violation flagged |
| Southgate WsdCO0103721 | 55,000 | Surface water purchased | No current violation flagged |
| Eagle River WsdCO0119802 | 51,515 | Surface water | No current violation flagged |
| Green Mountain WsdCO0130321 | 49,400 | Surface water purchased | No current violation flagged |
| Northglenn City OfCO0101115 | 48,927 | Surface water | No current violation flagged |
| Southwest Metropolitan WsdCO0103723 | 48,648 | Surface water purchased | No current violation flagged |
| US Department Of The Army Fort CarsonCO0221445 | 48,000 | Surface water purchased | No current violation flagged |
| Erie Town OfCO0162255 | 47,444 | Surface water | No current violation flagged |
| Bancroft Clover WsdCO0130133 | 44,000 | Surface water purchased | No current violation flagged |
| Golden City OfCO0130040 | 38,288 | Surface water | No current violation flagged |
| Canon City City OfCO0122100 | 34,800 | Surface water | No current violation flagged |
| Clifton WdCO0139180 | 34,500 | Surface water | No current violation flagged |
| Durango City OfCO0134150 | 33,787 | Surface water | No current violation flagged |
| Aspen City OfCO0149122 | 31,100 | Surface water | No current violation flagged |
| Arapahoe Cnty WwwaCO0203002 | 31,000 | Ground water | No current violation flagged |
| Bear Creek WsdCO0130138 | 30,000 | Surface water purchased | No current violation flagged |
| Pueblo West MdCO0151650 | 30,000 | Surface water | No current violation flagged |
| Cherokee MdCO0121125 | 29,610 | Ground water | No current violation flagged |
| Lafayette City OfCO0107473 | 28,700 | Surface water | No current violation flagged |
| Breckenridge Town OfCO0159020 | 28,315 | Surface water | No current violation flagged |
| East Larimer County WdCO0135233 | 27,944 | Surface water purchased | Current monitoring/reporting flag |
| Firestone Town OfCO0162476 | 27,798 | Surface water purchased | No current violation flagged |
| Widefield WsdCO0121900 | 27,640 | Surface water purchased | No current violation flagged |
| Csu Main And West Housing CampusCO0235184 | 27,375 | Surface water purchased | No current violation flagged |
| Johnstown Town OfCO0162418 | 27,295 | Surface water | No current violation flagged |
| Grand Junction City OfCO0139321 | 26,000 | Surface water | No current violation flagged |
| Little Thompson WdCO0135477 | 25,654 | Surface water purchased | No current violation flagged |
| Fountain City OfCO0121275 | 25,130 | Surface water purchased | No current violation flagged |
| Crestview WsdCO0101040 | 23,756 | Surface water purchased | No current violation flagged |
| Windsor Town OfCO0162843 | 23,500 | Surface water purchased | No current violation flagged |
| Meridian MdCO0218015 | 23,415 | Surface water purchased | No current violation flagged |
| Cherry Creek Valley WsdCO0116175 | 22,000 | Surface water purchased | No current violation flagged |
| Louisville City OfCO0107487 | 20,975 | Surface water | No current violation flagged |
| Tri County WcdCO0143755 | 20,490 | Surface water purchased | No current violation flagged |
| Left Hand WdCO0107471 | 20,280 | Surface water | No current violation flagged |
| Security Water DistrictCO0121775 | 20,000 | Surface water purchased | No current violation flagged |
| Wheat Ridge Water DistrictCO0130842 | 20,000 | Surface water purchased | No current violation flagged |
| Platte Canyon WsdCO0103614 | 19,485 | Surface water purchased | No current violation flagged |
| Evans City OfCO0162260 | 19,369 | Surface water purchased | No current violation flagged |
| Montrose City OfCO0143518 | 19,305 | Surface water purchased | Other current violation flag |
| Mt Werner WdCO0154524 | 19,000 | Surface water | No current violation flagged |
| Willows WdCO0103100 | 19,000 | Surface water purchased | No current violation flagged |
| Woodmoor WsdCO0121950 | 18,031 | Surface water | No current violation flagged |
| Superior Md No 1CO0107725 | 17,900 | Surface water | No current violation flagged |
| Frederick Town OfCO0162288 | 17,173 | Surface water purchased | Current monitoring/reporting flag |
| US Air Force AcademyCO0121845 | 16,876 | Surface water purchased | No current violation flagged |
| Estes Park Town OfCO0135257 | 16,722 | Surface water | No current violation flagged |
| North Weld County WdCO0162553 | 15,890 | Surface water purchased | No current violation flagged |
| Evergreen MdCO0130030 | 15,750 | Surface water | No current violation flagged |
| Stonegate MdCO0118076 | 15,295 | Surface water purchased | No current violation flagged |
| Gypsum Town OfCO0119329 | 15,272 | Surface water | No current violation flagged |
| Black Hawk City OfCO0124147 | 15,167 | Surface water | No current violation flagged |
| Sterling City OfCO0138045 | 15,100 | Groundwater under influence of surface water | No current violation flagged |
| North Washington Street WsdCO0101105 | 14,500 | Surface water purchased | No current violation flagged |
| Berthoud Town OfCO0135138 | 14,211 | Surface water | No current violation flagged |
| Woodmen Hills MdCO0121930 | 13,888 | Ground water | No current violation flagged |
| Montezuma WcCO0142900 | 13,797 | Surface water | Current monitoring/reporting flag |
| Roxborough WsdCO0118055 | 13,765 | Surface water | No current violation flagged |
| Pinery WwdCO0118025 | 12,901 | Surface water purchased | No current violation flagged |
| Castle Pines North MdCO0118006 | 12,800 | Surface water purchased | No current violation flagged |
| Meridian Service MdCO0121455 | 12,760 | Ground water | No current violation flagged |
| Ft Lupton City OfCO0162291 | 12,099 | Surface water | No current violation flagged |
| Ft Morgan City OfCO0144005 | 12,000 | Surface water | No current violation flagged |
| Ken Caryl WsdCO0103075 | 12,000 | Surface water purchased | No current violation flagged |
| Lakehurst WsdCO0130466 | 12,000 | Surface water purchased | No current violation flagged |
| Severance Town OfCO0162707 | 11,733 | Surface water purchased | No current violation flagged |
| Wellington Town OfCO0135838 | 11,720 | Surface water | No current violation flagged |
| Federal Heights City OfCO0101055 | 11,678 | Surface water purchased | No current violation flagged |
| Sterling Ranch CabCO0118724 | 11,501 | Surface water purchased | No current violation flagged |
| Trinidad City OfCO0136800 | 11,400 | Surface water | No current violation flagged |
| Alamosa City OfCO0102100 | 11,271 | Ground water | No current violation flagged |
| Pagosa Area WsdCO0104300 | 11,069 | Surface water | No current violation flagged |
| Cottonwood WsdCO0118020 | 10,867 | Surface water purchased | No current violation flagged |
| Idaho Springs City OfCO0110020 | 10,432 | Surface water | No current violation flagged |
| North Table Mountain WsdCO0130105 | 10,000 | Surface water | No current violation flagged |
| Valley WdCO0130800 | 10,000 | Surface water purchased | No current violation flagged |
| Steamboat Springs City OfCO0154725 | 9,950 | Surface water purchased | No current violation flagged |
| Snake River WdCO0159105 | 9,900 | Ground water | No current violation flagged |
| Morrison Town OfCO0130085 | 9,887 | Surface water | No current violation flagged |
| Mountain Village Town OfCO0157400 | 9,700 | Ground water | No current violation flagged |
| St Charles Mesa WdCO0151750 | 9,690 | Surface water | No current violation flagged |
| Gunnison City OfCO0126325 | 9,610 | Ground water | No current violation flagged |
| Rifle City OfCO0123676 | 9,489 | Surface water | No current violation flagged |
| Glenwood Springs City OfCO0123314 | 9,428 | Surface water | No current violation flagged |
| Willowbrook WsdCO0130843 | 9,348 | Surface water purchased | No current violation flagged |
| Cherry Creek Village WdCO0103176 | 9,215 | Surface water purchased | No current violation flagged |
| Milliken Town OfCO0162511 | 9,200 | Surface water purchased | No current violation flagged |
| Craig City OfCO0141188 | 8,930 | Surface water | No current violation flagged |
| Cortez City OfCO0142200 | 8,770 | Surface water | No current violation flagged |
| Delta City OfCO0115205 | 8,700 | Surface water purchased | No current violation flagged |
| Woodland Park City OfCO0160900 | 8,500 | Surface water | No current violation flagged |
| Silverthorne Town OfCO0159095 | 8,400 | Ground water | No current violation flagged |
| La Junta City OfCO0145420 | 8,320 | Ground water | No current violation flagged |
| Inverness WsdCO0203012 | 8,140 | Surface water purchased | No current violation flagged |
| Morgan County Quality WdCO0144020 | 8,116 | Surface water purchased | No current violation flagged |
| Telluride Town OfCO0157800 | 7,900 | Surface water | No current violation flagged |
| Central Weld Cnty WdCO0162122 | 7,662 | Surface water purchased | No current violation flagged |
| Eagle Town OfCO0119233 | 7,511 | Surface water | No current violation flagged |
| Florence City OfCO0122500 | 7,500 | Surface water | No current violation flagged |
| Lamar City OfCO0150700 | 7,500 | Ground water | No current violation flagged |
| Parkville WdCO0133700 | 7,500 | Surface water | No current violation flagged |
| Todd Creek Village MdCO0101157 | 7,363 | Groundwater under influence of surface water | No current violation flagged |
| Eaton Town OfCO0162233 | 7,328 | Surface water purchased | No current violation flagged |
| Manitou Springs City OfCO0121450 | 6,938 | Surface water | No current violation flagged |
| Dacono City OfCO0162200 | 6,900 | Surface water purchased | No current violation flagged |
| Carbondale Town OfCO0123167 | 6,700 | Surface water | No current violation flagged |
| Winter Park WsdCO0125843 | 6,635 | Surface water | No current violation flagged |
| Lochbuie Town OfCO0162486 | 6,518 | Ground water | No current violation flagged |
| Stratmoor Hills WsdCO0121800 | 6,500 | Surface water purchased | No current violation flagged |
| Donala WsdCO0121175 | 6,421 | Surface water purchased | No current violation flagged |
| Snowmass Village WsdCO0149717 | 6,353 | Surface water | Current monitoring/reporting flag |
| Northern Douglas County WsdCO0118016 | 6,160 | Surface water purchased | No current violation flagged |
| Lakewood City OfCO0130467 | 6,000 | Surface water purchased | No current violation flagged |
| Copper Mountain Consolidated MdCO0159030 | 5,785 | Ground water | No current violation flagged |
| Monument Town OfCO0121475 | 5,740 | Ground water | No current violation flagged |
| Triview MdCO0121840 | 5,737 | Surface water purchased | No current violation flagged |
| Salida City OfCO0108700 | 5,666 | Surface water | No current violation flagged |
| Castle Pines Village MdCO0118005 | 5,656 | Ground water | Other current violation flag |
| Grand County Water No 1CO0125323 | 5,400 | Surface water | No current violation flagged |
| Georgetown Town OfCO0110015 | 5,315 | Surface water | No current violation flagged |
| Edgewater City OfCO0130237 | 5,300 | Surface water purchased | Other current violation flag |
| Brush City OfCO0144001 | 5,122 | Ground water | No current violation flagged |
| Limon Town OfCO0137015 | 5,080 | Ground water | No current violation flagged |
| New Castle Town OfCO0123538 | 5,024 | Surface water | No current violation flagged |
| Paint Brush HillsCO0221690 | 4,994 | Ground water | No current violation flagged |
| Northern Colorado WaCO0135554 | 4,675 | Surface water purchased | No current violation flagged |
| Keenesburg Town OfCO0162438 | 4,650 | Ground water | No current violation flagged |
| Monte Vista City OfCO0153600 | 4,600 | Ground water | No current violation flagged |
| Mid Valley MdCO0119508 | 4,588 | Ground water | No current violation flagged |
| Elizabeth Town OfCO0120010 | 4,523 | Ground water | No current violation flagged |
| Menoken WdCO0143506 | 4,500 | Surface water purchased | No current violation flagged |
| Frisco Town OfCO0159055 | 4,495 | Surface water | No current violation flagged |
| Rocky Ford City OfCO0145600 | 4,443 | Ground water | No current violation flagged |
| Bennett Town OfCO0101020 | 4,400 | Ground water | No current violation flagged |
| Glendale City OfCO0103055 | 4,400 | Surface water purchased | No current violation flagged |
| Ault Town OfCO0162125 | 4,220 | Surface water purchased | No current violation flagged |
| Battlement Mesa MdCO0123133 | 4,100 | Surface water | No current violation flagged |
| Yuma City OfCO0163020 | 4,049 | Ground water | Current monitoring/reporting flag |
| High View WdCO0130344 | 4,000 | Surface water purchased | No current violation flagged |
| Park Center WdCO0122600 | 4,000 | Surface water | No current violation flagged |
| West Fort Collins WdCO0135290 | 4,000 | Surface water purchased | No current violation flagged |
| Hayden Town OfCO0154333 | 3,982 | Surface water | No current violation flagged |
| Genesee WsdCO0130035 | 3,920 | Surface water | No current violation flagged |
| Perry Park WsdCO0118045 | 3,890 | Groundwater under influence of surface water | No current violation flagged |
| Chipeta WdCO0143176 | 3,802 | Surface water purchased | No current violation flagged |
| Buena Vista Town OfCO0108300 | 3,776 | Groundwater under influence of surface water | No current violation flagged |
| Central City City OfCO0124171 | 3,750 | Surface water | No current violation flagged |
| Ymca Rockies Wind RiverCO0135883 | 3,730 | Surface water purchased | Current monitoring/reporting flag |
| Burlington City OfCO0132005 | 3,720 | Ground water | Other current violation flag |
| Colorado Centre MdCO0121140 | 3,675 | Ground water | No current violation flagged |
| Silt Town OfCO0123710 | 3,536 | Surface water | No current violation flagged |
| Advenir French QuarterCO0116104 | 3,447 | Surface water purchased | No current violation flagged |
| Hudson Town OfCO0162359 | 3,350 | Surface water purchased | No current violation flagged |
| Mount Crested Butte WsdCO0126190 | 3,296 | Surface water | No current violation flagged |
| Meadowbrook WdCO0130500 | 3,290 | Surface water purchased | No current violation flagged |
| Dillon Town OfCO0159035 | 3,254 | Surface water | No current violation flagged |
| Winter Park Ranch WsdCO0125844 | 3,250 | Ground water | No current violation flagged |
| Walsenburg City OfCO0128900 | 3,230 | Surface water | Current health-based flag |
| Longs Peak WdCO0107486 | 3,200 | Surface water | No current violation flagged |
| Penrose WdCO0122700 | 3,149 | Surface water | No current violation flagged |
| Orchard City Town OfCO0115588 | 3,100 | Groundwater under influence of surface water | No current violation flagged |
| Animas WcCO0134020 | 3,096 | Ground water | No current violation flagged |
| Dillon Valley DistrictCO0159040 | 3,063 | Surface water | No current violation flagged |
| Palisade Town OfCO0139600 | 3,060 | Surface water | No current violation flagged |
| Olathe Town OfCO0143582 | 3,015 | Surface water purchased | No current violation flagged |
| Lyons Town OfCO0107496 | 2,990 | Surface water purchased | No current violation flagged |
| Platteville Town OfCO0162615 | 2,900 | Surface water purchased | No current violation flagged |
| Cripple Creek City OfCO0160100 | 2,817 | Surface water | No current violation flagged |
| Upper Surface Creek Domestic WuaCO0115784 | 2,800 | Surface water | No current violation flagged |
| Colorado City MdCO0151200 | 2,755 | Surface water | Current health-based flag |
| Palmer Lake Town OfCO0121575 | 2,686 | Surface water | No current violation flagged |
| Buffalo Mountain MdCO0159025 | 2,650 | Ground water | No current violation flagged |
| Center Town OfCO0155500 | 2,575 | Ground water | No current violation flagged |
| Holyoke City OfCO0148005 | 2,540 | Ground water | No current violation flagged |
| East Dillon WdCO0159045 | 2,501 | Groundwater under influence of surface water | No current violation flagged |
| North Pecos WsdCO0116553 | 2,500 | Surface water purchased | No current violation flagged |
| South Sheridan Water And Sewer DistCO0130718 | 2,500 | Surface water purchased | No current violation flagged |
| Wikiup MhpCO0101180 | 2,500 | Ground water | Current health-based flag |
02 / CITY REPORTS
Colorado city water-system reports
Colorado has 1 city reports meeting the publication threshold for covered systems or reported population served.
03 / COUNTY REPORTS
Colorado county water-system reports
Colorado has 35 county reports meeting the publication threshold for covered systems or reported population served.
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