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 |
|---|---|---|---|---|
|
Monarch Mountain Lodge Chaffee County |
247 | 14 | 5 | |
|
Perry Mansfield Camp Routt County |
216 | 4 | 1 | |
|
Catto Center at Toklat Ashcroft · Pitkin County |
206 | 3 | 0 | |
|
Hesperus Baptist Camp INC La Plata County |
206 | 5 | 0 | |
|
Bucksnort Saloon Jefferson County |
200 | 3 | 0 | |
|
Hamilton Creek MD Summit County |
200 | 2 | 0 | |
|
Red Rock Valley WD El Paso County |
200 | 7 | 1 | |
|
Swans Nest MD Summit County |
200 | 2 | 0 | |
|
Timbers Wsd Routt County |
200 | 4 | 0 | |
|
Harmels Ranch Resort Gunnison County |
198 | 4 | 1 | |
|
1859 Restaurant at Seven Falls El Paso County |
170 | 2 | 0 | |
|
Roundup River Ranch Eagle County |
167 | 3 | 1 | |
|
Climax Molybdenum CO Henderson Mill Grand County |
165 | 3 | 0 | |
|
Westcreek Lakes WD Douglas County |
165 | 8 | 2 | |
|
Stone Mountain Lodge and Cabins Boulder County |
160 | 4 | 1 | |
|
Rocky Mountain Mennonite Camp Teller County |
155 | 4 | 0 | |
|
Genoa Town of Lincoln County |
153 | 9 | 1 | |
|
Shwayder Camp Temple Emanuel Clear Creek County |
151 | 2 | 0 | |
|
Little Elk Creek Pitkin County |
150 | 4 | 0 | |
|
Mishawaka Larimer County |
134 | 2 | 0 | |
|
Farish Memorial Ctr 2 Usaf El Paso County |
132 | 2 | 0 | |
|
Ute Pass WA INC La Plata County |
120 | 6 | 1 | |
|
Ski Town Village Gunnison County |
113 | 5 | 0 | |
|
Xcel Energy Hayden Station Routt County |
110 | 3 | 0 | |
|
Alpine Brook WS Boulder County |
100 | 2 | 0 | |
|
Camp Eden Gilpin County |
100 | 3 | 0 | |
|
Durango Jcmhp, LLC La Plata County |
100 | 5 | 0 | |
|
Rocky Ridge Music Center Larimer County |
100 | 4 | 1 | |
|
Somerset Domestic WD Gunnison County |
100 | 4 | 0 | |
|
Sonlight Adventures INC Archuleta County |
95 | 5 | 1 | |
|
River Dance RV Park Eagle County |
94 | 4 | 0 | |
|
Shambhala Mountain Center Larimer County |
90 | 2 | 0 | |
|
Platte River Power Authority Larimer County |
88 | 1 | 0 | |
|
Lakeview Estates Hinsdale County |
85 | 2 | 0 | |
|
River-Dale Ranch Park County |
83 | 2 | 0 | |
|
South Fork Heights Apartments Rio Grande County |
80 | 10 | 3 | |
|
Trails End for Boys Larimer County |
80 | 2 | 0 | |
|
Trails End for Girls Larimer County |
80 | 3 | 1 | |
|
Meadow Mtn Water Supply Boulder County |
76 | 2 | 0 | |
|
Hermit Basin Lodge Custer County |
75 | 2 | 0 | |
|
Rainbow Lake Resort Buena Vista · Chaffee County |
75 | 4 | 0 | |
|
Divide South Teller County |
74 | 5 | 1 | |
|
Eleven Mile Ranch Association Park County |
72 | 4 | 0 | |
|
North Rainbow Falls WC Douglas County |
69 | 2 | 0 | |
|
Mill Creek Wia Clear Creek County |
67 | 4 | 0 | |
|
Mad Dog WC Delta County |
60 | 2 | 0 | |
|
Tall Pines Village La Plata County |
60 | 8 | 0 | |
|
Valley Maint Corp NO 2 Teller County |
55 | 9 | 2 | |
|
Cdot Eisenhower Johnson Tunnel Clear Creek County |
50 | 4 | 0 | |
|
Cragmont WC Jefferson County |
50 | 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.