TTHM (Total Trihalomethanes) violations in Colorado
181 active public water systems in Colorado had a TTHM (Total Trihalomethanes) violation in the past three years, 13 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Indian Hills WD Jefferson County |
1,300 | 5 | 1 | |
|
Ordway Town of Crowley County |
1,300 | 1 | 0 | |
|
Wigwam Mutual WC El Paso County |
1,300 | 4 | 0 | |
|
Limon Correctional Facility Lincoln County |
1,289 | 1 | 0 | |
|
Ellicott Elem SR High School El Paso County |
1,114 | 7 | 1 | |
|
Log Lane Village Town of Morgan County |
1,006 | 3 | 0 | |
|
Manassa Town of Conejos County |
976 | 3 | 1 | |
|
Stratton Town of Kit Carson County |
960 | 3 | 0 | |
|
Oak Creek Town of Routt County |
950 | 9 | 0 | |
|
Parker Evangelical Pres Church Pepc Douglas County |
950 | 1 | 0 | |
|
Park Forest El Paso County |
930 | 4 | 1 | |
|
Arbordale Acres MHP Boulder County |
901 | 5 | 0 | |
|
Bents Fort WC Otero County |
900 | 3 | 1 | |
|
Garden Valley El Paso County |
900 | 8 | 2 | |
|
Rmnp Headquarters East Larimer County |
900 | 2 | 0 | |
|
Highland Lakes WD Teller County |
875 | 7 | 2 | |
|
Nucla Town of Montrose County |
875 | 5 | 0 | |
|
Dove Creek Town of Dolores County |
850 | 6 | 1 | |
|
San Lazaro Mfctd Housing Community Boulder County |
844 | 5 | 0 | |
|
LA Jara Town of Conejos County |
825 | 4 | 2 | |
|
Baseline WD Boulder County |
820 | 1 | 0 | |
|
Gunnison County Wsd Gunnison County |
800 | 2 | 0 | |
|
Ignacio Town of La Plata County |
800 | 6 | 0 | |
|
Sage Wua El Paso County |
800 | 2 | 0 | |
|
Calhan Town of El Paso County |
780 | 4 | 1 | |
|
Sierra Middle School Douglas County |
750 | 1 | 0 | |
|
Rye Town of Pueblo County |
745 | 8 | 1 | |
|
Sanborn Western Camps Teller County |
736 | 4 | 0 | |
|
Centauri HS Centauri MS Conejos County |
700 | 6 | 1 | |
|
Teller County Wsd Teller County |
600 | 1 | 0 | |
|
Walden Town of Jackson County |
600 | 2 | 0 | |
|
Naturita Town of Montrose County |
585 | 4 | 0 | |
|
Conifer MD Jefferson County |
525 | 2 | 0 | |
|
Franklin Mobile Home Park Adams County |
513 | 4 | 0 | |
|
Countryside Estates Pueblo Pueblo County |
508 | 7 | 3 | |
|
EL Morro Mobile Estates El Paso County |
504 | 5 | 0 | |
|
Rockvale Town of Fremont County |
504 | 3 | 2 | |
|
Saguache Town of Saguache County |
504 | 9 | 1 | |
|
Colowyo Coal Company Moffat County |
500 | 2 | 0 | |
|
Lake Fork MHP Lake County |
487 | 1 | 0 | |
|
FT Garland Wsd Costilla County |
477 | 6 | 3 | |
|
Beulah Water Works District Pueblo County |
445 | 6 | 0 | |
|
Mountain View Village West Lake County |
440 | 3 | 0 | |
|
Brookside Town of Fremont County |
438 | 3 | 2 | |
|
Sargent Elem and New High School RE33 Rio Grande County |
426 | 4 | 0 | |
|
Steamboat Lake WD Routt County |
411 | 5 | 0 | |
|
Avilla Eastlake Thornton · Adams County |
410 | 6 | 1 | |
|
Forest Hills MD Riva Chase Jefferson County |
400 | 1 | 0 | |
|
Baxter Water and Services Pueblo County |
350 | 10 | 0 | |
|
Windcliff Poa Larimer County |
339 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) 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.