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 |
|---|---|---|---|---|
|
Frisco Town of Summit County |
4,495 | 2 | 1 | |
|
Buena Vista Town of Chaffee County |
3,776 | 1 | 0 | |
|
Ouray City of Ouray County |
1,460 | 7 | 0 | |
|
Highland Lakes WD Teller County |
875 | 7 | 2 | |
|
Idledale Wsd Jefferson County |
350 | 8 | 1 | |
|
Ggcsp Reverends Ridge Gilpin County |
301 | 1 | 1 | |
|
Spruce Hill Development Park County |
277 | 1 | 1 | |
|
Lodge at San Isabel Custer County |
200 | 2 | 2 | |
|
Mountain Prairie LLC Bent County |
126 | 5 | 0 | |
|
Gateway Childcare and Preschool Colorado Springs · El Paso County |
116 | 2 | 1 | |
|
Country Gardens MHP Arapahoe County |
115 | 6 | 2 | |
|
Durango Jcmhp, LLC La Plata County |
100 | 5 | 0 | |
|
Zuccaros Kitchen Park County |
78 | 2 | 0 | |
|
Grand Mesa Lodge Delta County |
62 | 3 | 2 | |
|
Hartman Town of Prowers County |
61 | 13 | 6 | |
|
Trujillo Meadows CG Conejos County |
45 | 3 | 1 | |
|
Pacheco Trailer Park Rio Grande County |
36 | 13 | 3 | |
|
Lake George Cabins and RV Park Park County |
33 | 2 | 1 | |
|
Ceesi Weld County |
30 | 1 | 1 | |
|
Clear Creek Cabins Clear Creek County |
19 | 1 | 0 | |
|
Parker Wsd Douglas County |
75,949 | 4 | 0 | |
|
Breckenridge Town of Summit County |
28,315 | 4 | 0 | |
|
Sterling City of Logan County |
15,100 | 1 | 0 | |
|
Telluride Town of San Miguel County |
7,900 | 6 | 0 | |
|
Stratmoor Hills Wsd El Paso County |
6,500 | 6 | 0 | |
|
Grand County Water NO 1 Grand County |
5,400 | 11 | 0 | |
|
Perry Park Wsd Douglas County |
3,890 | 3 | 0 | |
|
Mount Crested Butte Wsd Gunnison County |
3,296 | 1 | 0 | |
|
EL Jebel MHP Eagle County |
1,962 | 2 | 0 | |
|
Aspen Ski CO Sundeck Pitkin County |
1,801 | 3 | 0 | |
|
Ski Cooper Lake County |
973 | 1 | 0 | |
|
Cottonwood Springs MHP Garfield County |
750 | 2 | 0 | |
|
MT Vernon Country Club Jefferson County |
734 | 2 | 0 | |
|
Yampa Town of Routt County |
467 | 5 | 0 | |
|
ST Marys Glacier Wsd Clear Creek County |
451 | 6 | 1 | |
|
Rifle Gap State Park Garfield County |
356 | 3 | 0 | |
|
Fruitland Domestic WC Montrose County |
335 | 10 | 3 | |
|
WJ Metro District Pitkin County |
324 | 3 | 0 | |
|
Aspen Village MD Pitkin County |
300 | 8 | 0 | |
|
C Lazy U Ranch Grand County |
251 | 1 | 0 | |
|
Florissant Wsd Teller County |
250 | 9 | 0 | |
|
Monarch Mountain Lodge Chaffee County |
247 | 14 | 5 | |
|
Cathedral WC Delta County |
200 | 2 | 0 | |
|
Red Rock Valley WD El Paso County |
200 | 7 | 1 | |
|
Swans Nest MD Summit County |
200 | 2 | 0 | |
|
Harmels Ranch Resort Gunnison County |
198 | 4 | 1 | |
|
Ophir Town of San Miguel County |
193 | 9 | 1 | |
|
Roundup River Ranch Eagle County |
167 | 3 | 1 | |
|
Westcreek Lakes WD Douglas County |
165 | 8 | 2 | |
|
Ragged Mountain Camp Gunnison County |
152 | 4 | 0 |
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.