Surface Water Treatment Rule (SWTR) violations in Colorado
284 active public water systems in Colorado had a Surface Water Treatment Rule (SWTR) violation in the past three years, 50 of them in the latest quarter of EPA's data. What Surface Water Treatment Rule (SWTR) is and why it matters.
Systems with a Surface Water Treatment Rule (SWTR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Grand Junction City of Mesa County |
26,000 | 2 | 0 | |
|
Gypsum Town of Eagle County |
15,272 | 2 | 0 | |
|
Florence City of Fremont County |
7,500 | 4 | 0 | |
|
Steamboat Ski Corp Thunderhead Routt County |
6,517 | 2 | 0 | |
|
Grand County Water NO 1 Grand County |
5,400 | 11 | 0 | |
|
Perry Park Wsd Douglas County |
3,890 | 3 | 0 | |
|
Keystone Summit Lodge Summit County |
3,241 | 2 | 0 | |
|
Aspen Ski Corp HI Alpine L9 Pitkin County |
2,900 | 2 | 0 | |
|
Colorado City MD Pueblo County |
2,755 | 8 | 4 | |
|
Towaoc Water System County |
2,020 | 5 | 2 | |
|
Mighty Argo Metropolitan District #2 Idaho Springs · Clear Creek County |
2,000 | 2 | 0 | |
|
Norwood Water Commission San Miguel County |
1,700 | 3 | 0 | |
|
Ouray City of Ouray County |
1,460 | 7 | 0 | |
|
Steamboat Lake State Park Routt County |
1,092 | 3 | 2 | |
|
San Lazaro Mfctd Housing Community Boulder County |
844 | 5 | 0 | |
|
Camp Alexander Boy Scouts Park County |
785 | 3 | 0 | |
|
Lake City Town of Hinsdale County |
587 | 1 | 0 | |
|
Tiger Run HOA RV Park Summit County |
510 | 2 | 1 | |
|
Yampa Town of Routt County |
467 | 5 | 0 | |
|
Stagecoach State Park Routt County |
405 | 4 | 0 | |
|
Skylark Mobile Home Community Boulder County |
342 | 3 | 0 | |
|
Aspen Equestrian Blue Creek Ranch Garfield County |
300 | 3 | 0 | |
|
Sylvan Lake State Park Eagle County |
255 | 4 | 1 | |
|
Applewood MHC Logan County |
250 | 3 | 0 | |
|
Mile High Mobile Home Park Adams County |
209 | 3 | 0 | |
|
Buttermilk MD Pitkin County |
200 | 7 | 2 | |
|
Ophir Town of San Miguel County |
193 | 9 | 1 | |
|
Redstone Wsd Pitkin County |
180 | 3 | 0 | |
|
Stone Mountain Lodge and Cabins Boulder County |
160 | 4 | 1 | |
|
Longview Mobile Home Park Denver County |
147 | 3 | 0 | |
|
Pine Creek Cookhouse Pitkin County |
144 | 3 | 0 | |
|
CU Mountain Research Station Boulder County |
140 | 2 | 1 | |
|
Huajatolla Valley Estates INC Huerfano County |
132 | 8 | 2 | |
|
Ponderosa Lodge INC Chaffee County |
125 | 4 | 1 | |
|
RD Nixon Plant Clear Spring Ranch El Paso County |
124 | 1 | 1 | |
|
Durango Jcmhp, LLC La Plata County |
100 | 5 | 0 | |
|
Rocky Ridge Music Center Larimer County |
100 | 4 | 1 | |
|
Eden Valley Institute Larimer County |
91 | 11 | 1 | |
|
Steamboat Mountain School Routt County |
83 | 8 | 0 | |
|
Crystola Roadhouse Teller County |
80 | 6 | 2 | |
|
Trappers Lake Lodge Garfield County |
75 | 5 | 1 | |
|
Minnesota Pipeline Paonia · Delta County |
72 | 5 | 3 | |
|
Todd W Knight Pueblo County |
71 | 3 | 0 | |
|
Steamboat Golf Club INC Routt County |
67 | 5 | 1 | |
|
Rifle Falls State Park Garfield County |
64 | 4 | 3 | |
|
Highlands Camp and Retreat Center Boulder County |
63 | 5 | 2 | |
|
Escalante Village Durango · La Plata County |
62 | 7 | 5 | |
|
Durango Falfa MHC LLC La Plata County |
40 | 3 | 0 | |
|
Lake Capote Recreation Area County |
29 | 1 | 0 | |
|
Mineral Farms Wua Ouray County |
24 | 4 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Surface Water Treatment Rule (SWTR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Surface Water Treatment Rule (SWTR) 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.