E. coli (Escherichia coli) violations in Colorado
73 active public water systems in Colorado had a E. coli (Escherichia coli) violation in the past three years, 20 of them in the latest quarter of EPA's data. What E. coli (Escherichia coli) is and why it matters.
Systems with a E. coli (Escherichia coli) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sleepy Bear MHP Routt County |
150 | 9 | 0 | |
|
Huajatolla Valley Estates INC Huerfano County |
132 | 8 | 2 | |
|
Branson Town of Las Animas County |
131 | 3 | 0 | |
|
Gcc Energy Water System La Plata County |
120 | 3 | 0 | |
|
Steamboat Lake Outpost Routt County |
116 | 1 | 0 | |
|
Vista Verde Guest Ranch Routt County |
104 | 2 | 0 | |
|
Rainbow Trout Ranch Conejos County |
90 | 2 | 1 | |
|
South Fork Heights Apartments Rio Grande County |
80 | 10 | 3 | |
|
Rainbow Lake Resort Buena Vista · Chaffee County |
75 | 4 | 0 | |
|
Trappers Lake Lodge Garfield County |
75 | 5 | 1 | |
|
Divide South Teller County |
74 | 5 | 1 | |
|
Eleven Mile Ranch Association Park County |
72 | 4 | 0 | |
|
Tall Pines Village La Plata County |
60 | 8 | 0 | |
|
Mineral Springs Foundation Manitou Springs (manitou) · El Paso County |
56 | 2 | 0 | |
|
Valley Maint Corp NO 2 Teller County |
55 | 9 | 2 | |
|
Hahns Peak Village HOA Routt County |
52 | 1 | 0 | |
|
Summit Properties Colorado LLC Larimer County |
48 | 1 | 0 | |
|
Rancho del Rio Eagle County |
43 | 4 | 0 | |
|
Hill Top General Store Larimer County |
42 | 5 | 0 | |
|
Historic Pines Ranch Custer County |
39 | 5 | 1 | |
|
Glen Echo Resort Larimer County |
38 | 5 | 1 | |
|
Old Fort Lewis La Plata County |
37 | 3 | 0 | |
|
Stucker Mesa Domestic WC Delta County |
36 | 5 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved E. coli (Escherichia coli), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not E. coli (Escherichia coli) 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.