Interim Enhanced Surface Water Treatment Rule violations in Colorado
170 active public water systems in Colorado had a Interim Enhanced Surface Water Treatment Rule violation in the past three years, 30 of them in the latest quarter of EPA's data. What Interim Enhanced Surface Water Treatment Rule is and why it matters.
Systems with a Interim Enhanced Surface Water Treatment Rule violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cattle Creek Wua Garfield County |
47 | 3 | 0 | |
|
Hill Top General Store Larimer County |
42 | 5 | 0 | |
|
Red Feather Super Market Larimer County |
41 | 2 | 0 | |
|
Navajo River Ranch Poa Archuleta County |
40 | 1 | 0 | |
|
Historic Pines Ranch Custer County |
39 | 5 | 1 | |
|
Glen Echo Resort Larimer County |
38 | 5 | 1 | |
|
Inn of Glen Haven Larimer County |
37 | 5 | 0 | |
|
Old Fort Lewis La Plata County |
37 | 3 | 0 | |
|
Hidden Valley Ranch Pagosa Springs · Archuleta County |
34 | 2 | 0 | |
|
Sunset Lake Summer Home Owners Mesa County |
32 | 3 | 0 | |
|
Lake San Cristobal HOA Hinsdale County |
30 | 3 | 0 | |
|
Camp V Montrose County |
29 | 6 | 0 | |
|
Quartz Creek Property Owners Association Gunnison County |
29 | 3 | 0 | |
|
Echo Basin Ranch Montezuma County |
27 | 5 | 0 | |
|
Sundance Trail Guest Ranch Larimer County |
27 | 5 | 0 | |
|
Alpine Mountain Ranch MD Routt County |
25 | 3 | 0 | |
|
Spanish Peaks Landowners Association INC Las Animas County |
25 | 2 | 0 | |
|
Telluride Pines HOA San Miguel County |
25 | 8 | 0 | |
|
Cabins on Spring Creek Subdivision Gunnison County |
15 | 2 | 0 | |
|
Fountain Valley Authority El Paso County |
13 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Interim Enhanced Surface Water Treatment Rule, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Interim Enhanced Surface Water Treatment Rule 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.