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 |
|---|---|---|---|---|
|
Steamboat Mountain School Routt County |
83 | 8 | 0 | |
|
South Fork Heights Apartments Rio Grande County |
80 | 10 | 3 | |
|
Cslb 41149 US 6 Avon · Eagle County |
76 | 1 | 0 | |
|
Sunshine Mesa Domestic WC Delta County |
76 | 5 | 0 | |
|
Sun Meadow Estates Garfield County |
75 | 8 | 0 | |
|
Divide South Teller County |
74 | 5 | 1 | |
|
Keeton Ranch Water El Paso County |
70 | 5 | 3 | |
|
Laplata Vista Estates HOA La Plata County |
68 | 2 | 0 | |
|
Signal Mountain Ranch Property Owners WC Pueblo County |
66 | 5 | 1 | |
|
Ginters Grove Domestic Water Corp Delta County |
62 | 1 | 0 | |
|
Lakeshore Mobile Home Park Grand County |
58 | 2 | 0 | |
|
Mountain Shadows MHP El Paso County |
56 | 6 | 2 | |
|
Peyton Pines El Paso County |
56 | 5 | 1 | |
|
Dinosaur Natl Mnt Hdqtrs Moffat County |
55 | 6 | 1 | |
|
Ravencrest Chalet Larimer County |
55 | 3 | 0 | |
|
Town of Winter Park Lift Transit Wts Winter Park · Grand County |
55 | 2 | 0 | |
|
Valley Maint Corp NO 2 Teller County |
55 | 9 | 2 | |
|
Blanca Forestry Products Fort Garland · Costilla County |
50 | 6 | 0 | |
|
South Side WA Otero County |
44 | 9 | 1 | |
|
Valley View Park Mobile Home Community Custer County |
44 | 4 | 0 | |
|
Guadalupe WA Conejos County |
42 | 1 | 0 | |
|
Sidney Peak Ranch Routt County |
42 | 3 | 0 | |
|
Van Den Berg MD La Plata County |
41 | 5 | 0 | |
|
Eastside MHP Chaffee County |
40 | 5 | 0 | |
|
Saddlehorn Ranch MD El Paso County |
39 | 8 | 1 | |
|
View Ridge Mutual WC Douglas County |
35 | 3 | 1 | |
|
Deep Creek Mountain Valley Estates Mineral County |
31 | 11 | 4 | |
|
G and M Mobile Home Park Rio Grande County |
30 | 11 | 0 | |
|
Alpine Mountain Ranch MD Routt County |
25 | 3 | 0 | |
|
Telluride Pines HOA San Miguel County |
25 | 8 | 0 | |
|
Moffat Town of Saguache County |
12 | 11 | 4 |
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.