Total Haloacetic Acids (HAA5) violations in Colorado
189 active public water systems in Colorado had a Total Haloacetic Acids (HAA5) violation in the past three years, 10 of them in the latest quarter of EPA's data. What Total Haloacetic Acids (HAA5) is and why it matters.
Systems with a Total Haloacetic Acids (HAA5) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Widefield Wsd El Paso County |
27,640 | 2 | 0 | |
|
Ralston Valley Wsd Jefferson County |
1,610 | 1 | 0 | |
|
Mancos Rural Water Company Montezuma County |
1,300 | 10 | 5 | |
|
Williamsburg Town of Fremont County |
775 | 3 | 0 | |
|
Climax Climax Mine Lake County |
615 | 5 | 0 | |
|
Montezuma Cnty WD NO 1 Montezuma County |
490 | 5 | 2 | |
|
Florissant Wsd Teller County |
250 | 9 | 0 | |
|
Ute Pass WA INC La Plata County |
120 | 6 | 1 | |
|
Valley Mobile Home LLC Alamosa County |
85 | 12 | 1 | |
|
Core Electric Cooperative Douglas County |
81 | 2 | 0 | |
|
US Department of the Army Fort Carson El Paso County |
48,000 | 1 | 0 | |
|
Cherokee MD El Paso County |
29,610 | 1 | 0 | |
|
Csu Main and West Housing Campus Larimer County |
27,375 | 5 | 0 | |
|
MT Werner WD Routt County |
19,000 | 3 | 0 | |
|
Estes Park Town of Larimer County |
16,722 | 1 | 0 | |
|
Pinery Wwd Douglas County |
12,901 | 1 | 0 | |
|
Severance Town of Weld County |
11,733 | 2 | 0 | |
|
Wellington Town of Larimer County |
11,720 | 5 | 0 | |
|
Sterling Ranch Cab Douglas County |
11,501 | 2 | 0 | |
|
Trinidad City of Las Animas County |
11,400 | 2 | 0 | |
|
Cottonwood Wsd Douglas County |
10,867 | 7 | 0 | |
|
Milliken Town of Weld County |
9,200 | 2 | 0 | |
|
Silverthorne Town of Summit County |
8,400 | 2 | 0 | |
|
Vail Assoc Midvail Eagle Eagle County |
7,600 | 3 | 0 | |
|
Florence City of Fremont County |
7,500 | 4 | 0 | |
|
Dacono City of Weld County |
6,900 | 1 | 0 | |
|
Stratmoor Hills Wsd El Paso County |
6,500 | 6 | 0 | |
|
Salida City of Chaffee County |
5,666 | 4 | 0 | |
|
Grand County Water NO 1 Grand County |
5,400 | 11 | 0 | |
|
Csu South Campus Fort Collins · Larimer County |
5,164 | 2 | 0 | |
|
Csu Foothills Campus Larimer County |
4,483 | 2 | 0 | |
|
Bennett Town of Adams County |
4,400 | 2 | 0 | |
|
Ault Town of Weld County |
4,220 | 2 | 0 | |
|
Battlement Mesa MD Garfield County |
4,100 | 6 | 0 | |
|
Hayden Town of Routt County |
3,982 | 4 | 0 | |
|
YMCA Rockies Wind River Larimer County |
3,730 | 7 | 2 | |
|
Dillon Town of Summit County |
3,254 | 1 | 0 | |
|
Upper Surface Creek Domestic Wua Delta County |
2,800 | 3 | 0 | |
|
Colorado City MD Pueblo County |
2,755 | 8 | 4 | |
|
East Dillon WD Summit County |
2,501 | 3 | 0 | |
|
Rangely Town of Rio Blanco County |
2,495 | 3 | 0 | |
|
Eldora Mountain Resort Boulder County |
2,400 | 1 | 0 | |
|
Conifer High School Jefferson County |
2,350 | 2 | 0 | |
|
Wray City of Yuma County |
2,342 | 4 | 2 | |
|
LA Salle Town of Weld County |
2,010 | 4 | 1 | |
|
Creede City of Mineral County |
1,965 | 1 | 0 | |
|
Steamboat II MD Routt County |
1,450 | 8 | 1 | |
|
Foxridge Farms MHP Arapahoe County |
1,440 | 4 | 0 | |
|
Del Norte Town of Rio Grande County |
1,429 | 4 | 0 | |
|
Lookout Mountain WD Clear Creek County |
1,378 | 1 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Total Haloacetic Acids (HAA5), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Total Haloacetic Acids (HAA5) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Colorado records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.