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 |
|---|---|---|---|---|
|
Fruitland Domestic WC Montrose County |
335 | 10 | 3 | |
|
Kit Carson Town of Cheyenne County |
326 | 4 | 0 | |
|
Lazy Glen HOA Pitkin County |
322 | 5 | 1 | |
|
East Boulder County WD Boulder County |
300 | 3 | 1 | |
|
Ranch at Roaring Fork Garfield County |
300 | 6 | 1 | |
|
Starwood Metropolitan District Pitkin County |
300 | 3 | 0 | |
|
Will O Wisp Metro District Park County |
300 | 2 | 1 | |
|
Cotopaxi School Fremont County |
294 | 3 | 0 | |
|
Crestone WS Saguache County |
293 | 4 | 0 | |
|
Wilson Mesa San Miguel County |
290 | 6 | 0 | |
|
Xcel Energy Comanche Plant Pueblo County |
272 | 3 | 0 | |
|
Valley WC Otero County |
270 | 6 | 2 | |
|
Nueva Vida Mobile Home Park Larimer County |
266 | 7 | 3 | |
|
Annunciation Heights Larimer County |
260 | 2 | 0 | |
|
Shangrila MHP Colorado Springs · El Paso County |
260 | 1 | 0 | |
|
Capulin WD Conejos County |
250 | 7 | 1 | |
|
Tree Haus MD Routt County |
248 | 1 | 0 | |
|
Monarch Mountain Lodge Chaffee County |
247 | 14 | 5 | |
|
Buttermilk MD Pitkin County |
200 | 7 | 2 | |
|
Red Rock Valley WD El Paso County |
200 | 7 | 1 | |
|
Roaring Fork MHP Pitkin County |
200 | 10 | 0 | |
|
Ophir Town of San Miguel County |
193 | 9 | 1 | |
|
Tranquil Acres WS Teller County |
180 | 4 | 1 | |
|
Lazear Domestic WC Delta County |
178 | 8 | 2 | |
|
Deserado Mine Rio Blanco County |
175 | 4 | 0 | |
|
Travois HOA Arapahoe County |
175 | 3 | 1 | |
|
Climax Molybdenum CO Henderson Mill Grand County |
165 | 3 | 0 | |
|
Westcreek Lakes WD Douglas County |
165 | 8 | 2 | |
|
Knolls at Durango HOA La Plata County |
150 | 3 | 0 | |
|
Moffat School Saguache County |
150 | 2 | 1 | |
|
Sleepy Bear MHP Routt County |
150 | 9 | 0 | |
|
Stage Run HOA Arapahoe County |
150 | 4 | 1 | |
|
Huajatolla Valley Estates INC Huerfano County |
132 | 8 | 2 | |
|
Shadow Mountain Mobile Home Park El Paso County |
132 | 8 | 2 | |
|
Castlewood Community Preschool Douglas County |
125 | 9 | 0 | |
|
Ramah Town of El Paso County |
125 | 7 | 2 | |
|
Gcc Rio Grande Red Rock Plant Pueblo County |
124 | 3 | 0 | |
|
Cokedale Town of Trinidad · Las Animas County |
120 | 4 | 1 | |
|
Hidden Valley HOA Water Company Paonia · Delta County |
120 | 5 | 0 | |
|
North Routt Community Charter School Routt County |
120 | 2 | 0 | |
|
Country Gardens MHP Arapahoe County |
115 | 6 | 2 | |
|
Neighbors of Dreamland MHP Pueblo County |
115 | 5 | 2 | |
|
Ski Town Village Gunnison County |
113 | 5 | 0 | |
|
Chancellors MHC El Paso County |
100 | 5 | 0 | |
|
Somerset Domestic WD Gunnison County |
100 | 4 | 0 | |
|
West Grand Valley WA Otero County |
100 | 5 | 1 | |
|
Eden Valley Institute Larimer County |
91 | 11 | 1 | |
|
Grandview MHP El Paso County |
90 | 8 | 3 | |
|
CD Water Ordway · Crowley County |
89 | 4 | 0 | |
|
Deep Creek Creede Haven Mineral County |
86 | 6 | 2 |
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.