Colorado
906 Utilities
Serving: 6,343,000
Data available: 2014-2019
Contaminants Found: 88
EWG's drinking water quality report for Colorado shows results of tests conducted by the water utilities in Colorado and provided to EWG by the Colorado Department of Public Health & Environment.
Below are utilities in Colorado serving over 10,000 people, listed alphabetically. Click the "more" button below to get the full list of utilities serving over 10,000 people.
Large utilities in Colorado
| Utility | Location | People Served |
|---|---|---|
| Arapahoe Cnty Wwwa | Centennial, CO | 31,000 |
| Bancroft Clover WSD | Lakewood, CO | 44,000 |
| Bear Creek WSD | Lakewood, CO | 30,000 |
| Canon City | Canon City, CO | 34,800 |
| Castle Rock | Castle Rock, CO | 92,372 |
| Centennial Water and Sanitation District | Highlands Ranch, CO | 96,553 |
| Cherokee MD | Colorado Springs, CO | 23,000 |
| Cherry Creek Village Water District | Englewood, CO | 10,000 |
| City and County of Broomfield | Broomfield, CO | 93,051 |
| City of Arvada | Arvada, CO | 146,743 |
| City of Aspen | Aspen, CO | 31,100 |
| City of Aurora | Aurora, CO | 314,346 |
| City of Black Hawk | Black Hawk, CO | 15,167 |
| City of Boulder | Boulder, CO | 166,080 |
| City of Brighton | Brighton, CO | 36,010 |
| City of Durango | Durango, CO | 33,994 |
| City of Englewood | Englewood, CO | 46,541 |
| City of Evans | Evans, CO | 19,369 |
| City of Federal Heights | Federal Heights, CO | 11,678 |
| City of Fort Collins | Fort Collins, CO | 124,262 |
| City of Fountain | Fountain, CO | 29,000 |
| City of Ft Morgan | Fort Morgan, CO | 12,000 |
| City of Golden | Golden, CO | 29,635 |
| City of Greeley | Greeley, CO | 108,000 |
| City of Lafayette | Lafayette, CO | 28,700 |
| City of Longmont | Longmont, CO | 87,850 |
| City of Louisville | Louisville, CO | 20,319 |
| City of Loveland | Loveland, CO | 75,840 |
| City of Montrose | Montrose, CO | 19,305 |
| City of Northglenn | Northglenn, CO | 49,650 |
Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Colorado
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
Large utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Colorado
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
| Utility | Location | People Served | Violation Points |
|---|---|---|---|
| City and County of Broomfield | Broomfield, CO | 93,051 | 5 |
| City of Trinidad | Trinidad, CO | 11,400 | 3 |
| Pagosa Area WSD | Pagosa Springs, CO | 11,069 | 1 |
| Windsor | Windsor, CO | 13,500 | 1 |
| Stonegate MD | Parker, CO | 15,071 | 1 |
| US Air Force Academy | Usaf Academy, CO | 16,876 | 1 |
| Mt Werner WD | Steamboat Springs, CO | 16,980 | 1 |
| City of Lafayette | Lafayette, CO | 28,700 | 1 |
| City of Aspen | Aspen, CO | 31,100 | 1 |
| City of Loveland | Loveland, CO | 75,840 | 1 |
| Centennial Water and Sanitation District | Highlands Ranch, CO | 96,553 | 1 |
| City of Greeley | Greeley, CO | 108,000 | 1 |
Contaminants found in Colorado above health guidelines
| Found above health guidelines | Found | ||||||
|---|---|---|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served | |||
Total trihalomethanes (TTHMs) | 812 | 6,312,294 | 813 | 6,312,359 | |||
Haloacetic acids (HAA5) | 683 | 6,229,508 | 683 | 6,229,508 | |||
Bromodichloromethane | 649 | 6,072,456 | 649 | 6,072,456 | |||
Chloroform | 576 | 6,002,752 | 602 | 6,050,657 | |||
Dichloroacetic acid | 486 | 5,903,985 | 489 | 5,914,892 | |||
Trichloroacetic acid | 427 | 5,668,665 | 430 | 5,767,680 | |||
Haloacetic acids (HAA9) | 168 | 5,413,019 | 188 | 5,592,412 | |||
Dibromochloromethane | 607 | 5,163,762 | 618 | 5,337,932 | |||
Radium, combined (-226 & -228) | 608 | 4,630,738 | 596 | 4,502,207 | |||
Chromium (hexavalent) | 156 | 4,362,932 | 189 | 5,530,339 | |||
Dibromoacetic acid | 385 | 4,165,828 | 388 | 4,219,313 | |||
Arsenic | 308 | 2,831,141 | 308 | 2,831,141 | |||
Uranium | 436 | 2,174,162 | 552 | 4,696,268 | |||
Bromoform | 325 | 1,750,338 | 462 | 3,972,357 | |||
Nitrate | 497 | 1,588,720 | 756 | 5,797,066 | |||
Chlorite | 72 | 1,235,220 | 58 | 1,177,613 | |||
Nitrate and nitrite | 219 | 1,231,989 | 323 | 4,176,445 | |||
Chlorate | 18 | 632,807 | 135 | 3,443,986 | |||
Bromate | 8 | 271,450 | 9 | 271,644 | |||
1,4-Dioxane | 3 | 88,416 | 15 | 692,461 | |||
Perfluorohexane sulfonate (PFHXS) | 3 | 70,414 | 3 | 70,414 | |||
Perfluorooctane sulfonate (PFOS) | 3 | 70,414 | 3 | 70,414 | |||
Perfluorooctanoic acid (PFOA) | 3 | 70,414 | 3 | 70,414 | |||
Perfluoroheptanoic acid (PFHPA) | 3 | 70,414 | 3 | 70,414 | |||
Cadmium | 45 | 58,676 | 83 | 1,869,909 | |||
Tetrachloroethylene (perchloroethylene) | 7 | 48,602 | 8 | 112,410 | |||
Manganese | 1 | 31,000 | 194 | 5,394,126 | |||
Perfluorobutane sulfonate (PFBS) | 1 | 19,000 | 1 | 19,000 | |||
Lindane | 6 | 17,520 | 25 | 103,916 | |||
1,2-Dibromo-3-chloropropane (DBCP) | 2 | 6,055 | 2 | 6,055 | |||
Thallium | 10 | 6,034 | 49 | 1,858,326 | |||
Selenium | 5 | 1,732 | 517 | 4,199,116 | |||
Ethylene dibromide | 1 | 600 | 10 | 20,892 | |||
Heptachlor epoxide | 1 | 400 | 1 | 400 | |||
1,2-Dichloroethane | 1 | 30 | 1 | 30 | |||
Contaminants found in Colorado above legal limits
| Contaminant | # of Utilities | People Served | |
|---|---|---|---|
Radium, combined (-226 & -228) | 29 | 7,102 | |
Nitrate and nitrite | 1 | 6,000 | |
Nitrate | 1 | 6,000 | |
Arsenic | 5 | 1,560 | |
Haloacetic acids (HAA5) | 1 | 745 | |
Total trihalomethanes (TTHMs) | 1 | 745 | |
Uranium | 3 | 236 |