Colorado Water Systems
1,109 community water systems in Colorado, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).
Water Systems
1,109
Total Violations
5,332
Health Violations
429 systems
Population Served
7,202,051
Colorado operates 1,109 community water systems regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. Together these utilities serve an estimated 7,202,051 residents, each filing compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency.
Across the state, SDWIS records contain 5,332 total violations, of which 429 systems carry at least one active health-based violation, a Maximum Contaminant Level (MCL) exceedance or treatment-technique failure. That represents roughly 39% of Colorado systems.
Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.
Which water systems have violations? (175)
| # | System Name | Violations | Health |
|---|---|---|---|
| 1 | MAY VALLEY WA Wiley | 412 | Yes |
| 2 | SOUTH SWINK WATER AUTHORITY La Junta | 264 | Yes |
| 3 | RYE TOWN OF Rye | 100 | Yes |
| 4 | MANZANOLA TOWN OF Manzanola | 96 | Yes |
| 5 | COLORADO CITY MD Colorado City | 87 | Yes |
| 6 | EUREKA WC Rocky Ford | 85 | Yes |
| 7 | BURLINGTON CITY OF Burlington | 83 | Yes |
| 8 | FT LUPTON CITY OF Fort Lupton | 48 | Yes |
| 9 | HOMESTEAD WC Evergreen | 45 | Yes |
| 10 | PINEWOOD SPRINGS WD Lyons | 43 | Yes |
| 11 | EMPIRE TOWN OF Empire | 42 | Yes |
| 12 | LOOKOUT MOUNTAIN WD Wheat Ridge | 41 | Yes |
| 13 | HOLLY TOWN OF Holly | 37 | Yes |
| 14 | UPPER SURFACE CREEK DOMESTIC WUA Cedaredge | 31 | Yes |
| 15 | YANKEE SPRINGS MEADOWS Denver | 31 | Yes |
| 16 | OAK CREEK TOWN OF Oak Creek | 30 | Yes |
| 17 | PINE DRIVE WD Beulah | 29 | Yes |
| 18 | WALSENBURG CITY OF Walsenburg | 28 | Yes |
| 19 | BEULAH WATER WORKS DISTRICT Beulah | 26 | Yes |
| 20 | WALSH TOWN OF Walsh | 23 | Yes |
| 21 | MONUMENT TOWN OF Monument | 22 | Yes |
| 22 | LA VETA TOWN OF La Veta | 21 | Yes |
| 23 | RIVERVIEW CG Windsor | 20 | Yes |
| 24 | YMCA ROCKIES WIND RIVER Estes Park | 19 | Yes |
| 25 | TELLURIDE TOWN OF Telluride | 18 | Yes |
| 26 | TELLER COUNTY WSD Woodland Park | 18 | Yes |
| 27 | ST MARYS GLACIER WSD Wheat Ridge | 16 | Yes |
| 28 | VICTOR CITY OF Victor | 15 | Yes |
| 29 | RIDGWAY TOWN OF Ridgway | 14 | Yes |
| 30 | NATURITA TOWN OF Naturita | 13 | Yes |
| 31 | HUDSON TOWN OF Hudson | 12 | Yes |
| 32 | FOWLER TOWN OF Fowler | 12 | Yes |
| 33 | DONALA WSD Colorado Springs | 11 | Yes |
| 34 | LAKE DURANGO WA Durango | 10 | Yes |
| 35 | PINE BLUFFS, TOWN OF Fort Collins | 10 | Yes |
| 36 | ANTONITO TOWN OF Antonito | 10 | Yes |
| 37 | DOVE CREEK TOWN OF Dove Creek | 10 | Yes |
| 38 | MT VERNON COUNTRY CLUB Greenwood Village | 10 | Yes |
| 39 | GRANADA TOWN OF Granada | 10 | Yes |
| 40 | YAMPA TOWN OF Yampa | 10 | Yes |
| 41 | EVERGREEN LAKE COMPANY Cimarron | 10 | Yes |
| 42 | WELLINGTON TOWN OF Wellington | 9 | Yes |
| 43 | STEAMBOAT II MD Steamboat Springs | 9 | Yes |
| 44 | GRAND COUNTY WATER NO 1 Winter Park | 8 | Yes |
| 45 | PAONIA TOWN OF Paonia | 8 | Yes |
| 46 | HIGHLAND LAKES WD Divide | 8 | Yes |
| 47 | TOWAOC WATER SYSTEM Towoac | 7 | Yes |
| 48 | BRIGHTON CITY OF Brighton | 6 | Yes |
| 49 | PUEBLO WEST MD Pueblo West | 6 | Yes |
| 50 | BRECKENRIDGE TOWN OF Breckenridge | 6 | Yes |
| 51 | BERTHOUD TOWN OF Berthoud | 6 | Yes |
| 52 | CARBONDALE TOWN OF Carbondale | 6 | Yes |
| 53 | INDIAN HILLS WD Indian Hills | 6 | Yes |
| 54 | FOREST VIEW ACRES WD Greenwood Village | 6 | Yes |
| 55 | BROOMFIELD CITY AND COUNTY OF Broomfield | 5 | Yes |
| 56 | SUPERIOR MD NO 1 Superior | 5 | Yes |
| 57 | MT WERNER WD Steamboat Springs | 5 | Yes |
| 58 | MANITOU SPRINGS CITY OF Manitou Springs | 5 | Yes |
| 59 | KREMMLING TOWN OF Kremmling | 5 | Yes |
| 60 | SPRINGFIELD TOWN OF Springfield | 5 | Yes |
| 61 | STRATTON TOWN OF Stratton | 5 | Yes |
| 62 | GARDEN VALLEY Colorado Springs | 5 | Yes |
| 63 | CHEYENNE WELLS TOWN OF Cheyenne Wells | 5 | Yes |
| 64 | ELBERT CREEK WATER CO Durango | 5 | Yes |
| 65 | MASON MANOR Denver | 5 | Yes |
| 66 | VALLEY MAINT CORP NO 1 Divide | 5 | Yes |
| 67 | JOHNSTOWN TOWN OF Johnstown | 4 | Yes |
| 68 | LOUISVILLE CITY OF Louisville | 4 | Yes |
| 69 | RIFLE CITY OF Rifle | 4 | Yes |
| 70 | KEENESBURG TOWN OF Keenesburg | 4 | Yes |
| 71 | PARK CENTER WD Canon City | 4 | Yes |
| 72 | PONCHA SPRINGS TOWN OF Poncha Springs | 4 | Yes |
| 73 | JULESBURG TOWN OF Julesburg | 4 | Yes |
| 74 | MILE HI WATER INC HAULER Boulder | 4 | Yes |
| 75 | ALMA TOWN OF Alma | 4 | Yes |
| 76 | RICO TOWN OF Rico | 4 | Yes |
| 77 | GREEN MOUNTAIN WSD Lakewood | 3 | Yes |
| 78 | WIDEFIELD WSD Colorado Springs | 3 | Yes |
| 79 | ESTES PARK TOWN OF Estes Park | 3 | Yes |
| 80 | ROXBOROUGH WSD Littleton | 3 | Yes |
| 81 | STEAMBOAT SPRINGS CITY OF Steamboat Springs | 3 | Yes |
| 82 | EATON TOWN OF Eaton | 3 | Yes |
| 83 | DACONO CITY OF Dacono | 3 | Yes |
| 84 | SNOWMASS VILLAGE WSD Snowmass Village | 3 | Yes |
| 85 | PENROSE WD Penrose | 3 | Yes |
| 86 | LYONS TOWN OF Lyons | 3 | Yes |
| 87 | NEDERLAND TOWN OF Nederland | 3 | Yes |
| 88 | STRASBURG WSD Strasburg | 3 | Yes |
| 89 | HOTCHKISS TOWN OF Hotchkiss | 3 | Yes |
| 90 | MOUNTAIN WSD Conifer | 3 | Yes |
| 91 | MITCHELL COOPER DITCH PIPELINE Glenwood Springs | 3 | Yes |
| 92 | DURANGO WEST MD NO 2 Durango | 3 | Yes |
| 93 | DEBEQUE TOWN OF Debeque | 3 | Yes |
| 94 | FAIRPLAY TOWN OF Fairplay | 3 | Yes |
| 95 | SAN LAZARO MFCTD HOUSING COMMUNITY Lafayette | 3 | Yes |
| 96 | IGNACIO TOWN OF Ignacio | 3 | Yes |
| 97 | RED CLIFF TOWN OF Red Cliff | 3 | Yes |
| 98 | AGUILAR TOWN OF Aguilar | 3 | Yes |
| 99 | AVILLA EASTLAKE Greenwood Village | 3 | Yes |
| 100 | FT COLLINS CITY OF Fort Collins | 2 | Yes |
| 101 | BOULDER CITY OF Boulder | 2 | Yes |
| 102 | WOODMOOR WSD Monument | 2 | Yes |
| 103 | CORTEZ CITY OF Cortez | 2 | Yes |
| 104 | EAGLE TOWN OF Eagle | 2 | Yes |
| 105 | FLORENCE CITY OF Florence | 2 | Yes |
| 106 | SOUTH SHERIDAN WATER AND SEWER DIST Greenwood Village | 2 | Yes |
| 107 | AKRON TOWN OF Akron | 2 | Yes |
| 108 | FLAGLER TOWN OF Flagler | 2 | Yes |
| 109 | WEST OLIVE ESTATES Denver | 2 | Yes |
| 110 | OURAY CITY OF Ouray | 2 | Yes |
| 111 | DEL NORTE TOWN OF Del Norte | 2 | Yes |
| 112 | THE GROVE AT ALTA RIDGE Thornton | 2 | Yes |
| 113 | NUCLA TOWN OF Nucla | 2 | Yes |
| 114 | PIEDRA PARK MD Bayfield | 2 | Yes |
| 115 | ROGERS MESA WC Hotchkiss | 2 | Yes |
| 116 | DEER CREEK WD Wheat Ridge | 2 | Yes |
| 117 | DURANGO WEST MD NO 1 Durango | 2 | Yes |
| 118 | MILE HIGH WC Broomfield | 2 | Yes |
| 119 | SKYLINE VILLAGE MOBILE HOME PK Littleton | 2 | Yes |
| 120 | SWINK TOWN OF Swink | 2 | Yes |
| 121 | OTIS TOWN OF Otis | 2 | Yes |
| 122 | EL MORRO MOBILE ESTATES Littleton | 2 | Yes |
| 123 | ROCKVALE TOWN OF Rockvale | 2 | Yes |
| 124 | MONTEZUMA CNTY WD NO 1 Cortez | 2 | Yes |
| 125 | MOUNTAINSIDE ESTATES MHP Lakewood | 2 | Yes |
| 126 | BELLEVIEW CHRISTIAN COLLEGE Westminster | 2 | Yes |
| 127 | GROVELAND MANOR Denver | 2 | Yes |
| 128 | ENGLEWOOD CITY OF Englewood | 1 | Yes |
| 129 | CLIFTON WD Clifton | 1 | Yes |
| 130 | WHEAT RIDGE WATER DISTRICT Wheat Ridge | 1 | Yes |
| 131 | US AIR FORCE ACADEMY Usaf Academy | 1 | Yes |
| 132 | NORTH WASHINGTON STREET WSD Denver | 1 | Yes |
| 133 | PINERY WWD Parker | 1 | Yes |
| 134 | WOODLAND PARK CITY OF Woodland | 1 | Yes |
| 135 | STRATMOOR HILLS WSD Colorado Springs | 1 | Yes |
| 136 | NEW CASTLE TOWN OF New Castle | 1 | Yes |
| 137 | FRISCO TOWN OF Frisco | 1 | Yes |
| 138 | SILT TOWN OF Silt | 1 | Yes |
| 139 | ADVENIR FRENCH QUARTER Denver | 1 | Yes |
| 140 | SILVERTON TOWN OF Silverton | 1 | Yes |
| 141 | SPRING CANYON WSD Fort Collins | 1 | Yes |
| 142 | LAS ANIMAS CITY OF Las Animas | 1 | Yes |
| 143 | KIMBERLY HILLS MHP Lakewood | 1 | Yes |
| 144 | EL JEBEL MHP El Jebel | 1 | Yes |
| 145 | AVONDALE WSD Pueblo | 1 | Yes |
| 146 | DENVER CASCADE MHP Wheat Ridge | 1 | Yes |
| 147 | MINTURN TOWN OF Minturn | 1 | Yes |
| 148 | EDGEMONT RANCH MD Durango | 1 | Yes |
| 149 | GILCREST TOWN OF Gilcrest | 1 | Yes |
| 150 | PALMS OF ARCHER Denver | 1 | Yes |
| 151 | NORTH LINCOLN WSD Denver | 1 | Yes |
| 152 | PARK FOREST Colorado Springs | 1 | Yes |
| 153 | ARBORDALE ACRES MHP Lafayette | 1 | Yes |
| 154 | HUGO TOWN OF Hugo | 1 | Yes |
| 155 | SAN JUAN RIVER VILLAGE MD Pagosa Springs | 1 | Yes |
| 156 | GOLDEN TERRACE WEST Wheat Ridge | 1 | Yes |
| 157 | CALHAN TOWN OF Calhan | 1 | Yes |
| 158 | SPRING HILL MHP Denver | 1 | Yes |
| 159 | ACADEMY WSD Castle Rock | 1 | Yes |
| 160 | COLORADO MTN COLLEGE SVC Glenwood Springs | 1 | Yes |
| 161 | KEYSTONE RANCH Keystone | 1 | Yes |
| 162 | FRIENDLY VILLAGE OF GREELEY MHP Lakewood | 1 | Yes |
| 163 | PRAIRIE GREENS MHP Frederick | 1 | Yes |
| 164 | LAKE CITY TOWN OF Lake City | 1 | Yes |
| 165 | GOLDEN TERRACE VILLAGE Wheat Ridge | 1 | Yes |
| 166 | KV HOA INC Moffat | 1 | Yes |
| 167 | COSTILLA COUNTY WS San Luis | 1 | Yes |
| 168 | BRUSH CREEK WD Aspen | 1 | Yes |
| 169 | COUNTRYSIDE ESTATES MHC Pueblo | 1 | Yes |
| 170 | CRAWFORD MESA WA Crawford | 1 | Yes |
| 171 | CHEYENNE MOUNTAIN ESTATES MHP Lafayette | 1 | Yes |
| 172 | WESTWOOD LAKES WD Woodland Park | 1 | Yes |
| 173 | FLEMING TOWN OF Fleming | 1 | Yes |
| 174 | GOLDEN TERRACE SOUTH Wheat Ridge | 1 | Yes |
| 175 | ALEDO MOBILE HOME PARK Denver | 1 | Yes |
Systems with No Violations (325)
325 water systems in Colorado have zero recorded violations. Showing the 50 largest by population served.
DENVER WATER BOARD (1,287,000) AURORA CITY OF (533,407) COLORADO SPRINGS UTILITIES (464,111) THORNTON CITY OF (226,465) WESTMINSTER CITY OF (202,078) ARVADA CITY OF (171,610) GREELEY CITY OF (132,310) PUEBLO BOARD OF WW (114,070) CASTLE ROCK TOWN OF (106,822) HIGHLANDS RANCH WSD (103,444) LONGMONT CITY OF (102,866) LOVELAND CITY OF (95,471) UTE WCD (91,186) CONSOLIDATED MUTUAL MAPLE GROVE (81,400) PARKER WSD (75,949) SOUTH ADAMS COUNTY WSD (74,341) EAST CHERRY CREEK VALLEY WSD (66,130) FT COLLINS LOVELAND WD (63,532) SOUTHGATE WSD (55,000) EAGLE RIVER WSD (51,515) NORTHGLENN CITY OF (48,927) SOUTHWEST METROPOLITAN WSD (48,648) US DEPARTMENT OF THE ARMY FORT CARSON (48,000) BANCROFT CLOVER WSD (44,000) ERIE TOWN OF (40,061) GOLDEN CITY OF (38,288) CANON CITY CITY OF (34,800) DURANGO CITY OF (33,787) ASPEN CITY OF (31,100) ARAPAHOE CNTY WWWA (31,000) BEAR CREEK WSD (30,000) CHEROKEE MD (29,610) LAFAYETTE CITY OF (28,700) EAST LARIMER COUNTY WD (27,944) FIRESTONE TOWN OF (27,798) CSU MAIN AND WEST HOUSING CAMPUS (27,375) GRAND JUNCTION CITY OF (26,000) LITTLE THOMPSON WD (25,654) FOUNTAIN CITY OF (25,130) CRESTVIEW WSD (23,756) WINDSOR TOWN OF (23,500) MERIDIAN MD (23,415) CHERRY CREEK VALLEY WSD (22,000) TRI COUNTY WCD (20,490) LEFT HAND WD (20,280) SECURITY WATER DISTRICT (20,000) PLATTE CANYON WSD (19,485) EVANS CITY OF (19,369) MONTROSE CITY OF (19,305) WILLOWS WD (19,000) +275 more
All Water Systems in Colorado (1,109)
Page 3 of 23, ordered by population served.
Frequently Asked Questions
How many water systems are in Colorado?
Colorado has 1,109 community water systems tracked by the EPA, serving a combined population of 7,202,051 people.
How many water systems in Colorado have health violations?
429 water systems in Colorado have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 39% of all systems in the state.
What is the total number of water violations in Colorado?
Colorado water systems have accumulated 5,332 total violations across all 1,109 community water systems.
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About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.