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 |
|---|---|---|---|---|
|
Orchard City Town of Delta County |
3,100 | 4 | 0 | |
|
Royal Gorge Bridge CO of Colo Fremont County |
3,024 | 5 | 0 | |
|
Molson Coors Beverage Company Jefferson County |
2,725 | 1 | 0 | |
|
East Dillon WD Summit County |
2,501 | 3 | 0 | |
|
Granby Town of South Service Area Grand County |
2,300 | 1 | 0 | |
|
Hotchkiss Town of Delta County |
2,050 | 4 | 0 | |
|
Mountain Wsd Jefferson County |
1,941 | 4 | 0 | |
|
Kremmling Town of Grand County |
1,859 | 2 | 0 | |
|
Ouray City of Ouray County |
1,460 | 7 | 0 | |
|
Indian Hills WD Jefferson County |
1,300 | 5 | 1 | |
|
Mancos Rural Water Company Montezuma County |
1,300 | 10 | 5 | |
|
Wigwam Mutual WC El Paso County |
1,300 | 4 | 0 | |
|
Bear Creek Lake Park Jefferson County |
1,250 | 2 | 0 | |
|
Edgemont Ranch MD La Plata County |
1,200 | 5 | 0 | |
|
Steamboat Lake State Park Routt County |
1,092 | 3 | 2 | |
|
Loveland Valley Ski Area Clear Creek County |
1,020 | 3 | 0 | |
|
Homestead WC Jefferson County |
1,000 | 4 | 0 | |
|
Ridgway Town of Ouray County |
1,000 | 5 | 1 | |
|
Oak Creek Town of Routt County |
950 | 9 | 0 | |
|
Dove Creek Town of Dolores County |
850 | 6 | 1 | |
|
Piedra Park MD Archuleta County |
850 | 4 | 1 | |
|
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 | |
|
Hot Sulphur Springs Town of Grand County |
687 | 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 | |
|
Beulah Water Works District Pueblo County |
445 | 6 | 0 | |
|
Grand Mesa MD 2 Mesa County |
426 | 2 | 0 | |
|
Young Life Frontier Ranch Chaffee County |
424 | 2 | 0 | |
|
Big Elk Meadows WA Larimer County |
405 | 4 | 0 | |
|
Bone Mesa Domestic WD Delta County |
400 | 1 | 0 | |
|
Monument Lake Resort Las Animas County |
380 | 2 | 0 | |
|
Idledale Wsd Jefferson County |
350 | 8 | 1 | |
|
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 | |
|
Alvarado CG 4122 Custer County |
300 | 6 | 0 | |
|
Aspen Village MD Pitkin County |
300 | 8 | 0 | |
|
Climax Henderson Mine Clear Creek County |
300 | 1 | 0 | |
|
Cotopaxi School Fremont County |
294 | 3 | 0 | |
|
Wilson Mesa San Miguel County |
290 | 6 | 0 | |
|
Jamestown Town of Boulder County |
280 | 7 | 1 | |
|
Xcel Energy Comanche Plant Pueblo County |
272 | 3 | 0 | |
|
Meeker Park Lodge Boulder County |
270 | 3 | 0 | |
|
Florissant Wsd Teller County |
250 | 9 | 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.