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 |
|---|---|---|---|---|
|
Ridgway Town of Ouray County |
1,000 | 5 | 1 | |
|
Antonito Town of Conejos County |
981 | 3 | 0 | |
|
Oak Creek Town of Routt County |
950 | 9 | 0 | |
|
Debeque Town of Mesa County |
911 | 7 | 0 | |
|
Fairplay Town of Park County |
909 | 2 | 0 | |
|
Arbordale Acres MHP Boulder County |
901 | 5 | 0 | |
|
Nucla Town of Montrose County |
875 | 5 | 0 | |
|
Dove Creek Town of Dolores County |
850 | 6 | 1 | |
|
Piedra Park MD Archuleta County |
850 | 4 | 1 | |
|
Rogers Mesa WC Delta County |
840 | 3 | 0 | |
|
Durango la Plata Airport La Plata County |
780 | 8 | 0 | |
|
Forest View Acres WD El Paso County |
772 | 2 | 0 | |
|
Pinewood Springs WD Larimer County |
745 | 6 | 1 | |
|
Rye Town of Pueblo County |
745 | 8 | 1 | |
|
Mile High WC Adams County |
700 | 4 | 0 | |
|
Hot Sulphur Springs Town of Grand County |
687 | 2 | 0 | |
|
EL Moro Hoehne Pipeline Assoc Las Animas County |
655 | 4 | 0 | |
|
Prairie Greens MHP Weld County |
654 | 4 | 0 | |
|
Climax Climax Mine Lake County |
615 | 5 | 0 | |
|
Naturita Town of Montrose County |
585 | 4 | 0 | |
|
Franklin Mobile Home Park Adams County |
513 | 4 | 0 | |
|
Countryside Estates Pueblo Pueblo County |
508 | 7 | 3 | |
|
EL Morro Mobile Estates El Paso County |
504 | 5 | 0 | |
|
Cheley Colorado Camp Main Larimer County |
500 | 2 | 0 | |
|
Longs Peak CG Larimer County |
500 | 2 | 0 | |
|
Bailey Wsd Park County |
483 | 7 | 3 | |
|
4 Eagle Ranch Eagle County |
470 | 4 | 0 | |
|
Alma Town of Park County |
460 | 2 | 0 | |
|
ST Marys Glacier Wsd Clear Creek County |
451 | 6 | 1 | |
|
Riverview CG Larimer County |
450 | 3 | 1 | |
|
Beulah Water Works District Pueblo County |
445 | 6 | 0 | |
|
Countryside of Greeley Weld County |
435 | 2 | 0 | |
|
Grand Mesa MD 2 Mesa County |
426 | 2 | 0 | |
|
Young Life Frontier Ranch Chaffee County |
424 | 2 | 0 | |
|
Mitchell Cooper Ditch Pipeline Garfield County |
415 | 4 | 0 | |
|
Avilla Eastlake Thornton · Adams County |
410 | 6 | 1 | |
|
Big Elk Meadows WA Larimer County |
405 | 4 | 0 | |
|
Monument Lake Resort Las Animas County |
380 | 2 | 0 | |
|
Holiday Village Mobile Home Community El Paso County |
360 | 2 | 0 | |
|
Santa FE Trail Ranch MD Las Animas County |
360 | 5 | 0 | |
|
Stoneybrook Pointe Weld County |
355 | 5 | 0 | |
|
Cucharas Sanitation and Water District Huerfano County |
343 | 3 | 1 | |
|
Fruitland Domestic WC Montrose County |
335 | 10 | 3 | |
|
WJ Metro District Pitkin County |
324 | 3 | 0 | |
|
Colorado Ntnl Monument Lat 2 Mesa County |
322 | 2 | 0 | |
|
Eagle Springs Golf Club Eagle County |
322 | 2 | 1 | |
|
Alvarado CG 4122 Custer County |
300 | 6 | 0 | |
|
Aspen Village MD Pitkin County |
300 | 8 | 0 | |
|
Terrace Park MHP Weld County |
297 | 2 | 0 | |
|
Cotopaxi School Fremont County |
294 | 3 | 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.