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 |
|---|---|---|---|---|
|
Westminster City of Adams County |
202,078 | 1 | 0 | |
|
FT Collins City of Larimer County |
179,901 | 4 | 0 | |
|
Arvada City of Jefferson County |
171,610 | 2 | 0 | |
|
Castle Rock Town of Douglas County |
110,298 | 1 | 0 | |
|
Broomfield City and County of Broomfield · Broomfield County |
106,153 | 1 | 0 | |
|
Parker Wsd Douglas County |
75,949 | 4 | 0 | |
|
Aspen City of Pitkin County |
31,100 | 3 | 0 | |
|
Lafayette City of Boulder County |
28,700 | 4 | 0 | |
|
Breckenridge Town of Summit County |
28,315 | 4 | 0 | |
|
Csu Main and West Housing Campus Larimer County |
27,375 | 5 | 0 | |
|
Meridian MD Douglas County |
23,415 | 3 | 0 | |
|
FT Lupton City of Weld County |
12,099 | 3 | 1 | |
|
Wellington Town of Larimer County |
11,720 | 5 | 0 | |
|
Morrison Town of Jefferson County |
9,887 | 2 | 0 | |
|
Craig City of Moffat County |
8,930 | 3 | 0 | |
|
Woodland Park City of Teller County |
8,500 | 3 | 0 | |
|
Telluride Town of San Miguel County |
7,900 | 6 | 0 | |
|
Carbondale Town of Garfield County |
6,700 | 3 | 0 | |
|
Stratmoor Hills Wsd El Paso County |
6,500 | 6 | 0 | |
|
Snowmass Village Wsd Pitkin County |
6,353 | 4 | 2 | |
|
Georgetown Town of Clear Creek County |
5,315 | 2 | 0 | |
|
Battlement Mesa MD Garfield County |
4,100 | 6 | 0 | |
|
Hayden Town of Routt County |
3,982 | 4 | 0 | |
|
Central City City of Gilpin County |
3,750 | 4 | 0 | |
|
YMCA Rockies Wind River Larimer County |
3,730 | 7 | 2 | |
|
Walsenburg City of Huerfano County |
3,230 | 6 | 2 | |
|
Orchard City Town of Delta County |
3,100 | 4 | 0 | |
|
Dillon Valley District Summit County |
3,063 | 2 | 0 | |
|
Royal Gorge Bridge CO of Colo Fremont County |
3,024 | 5 | 0 | |
|
Palmer Lake Town of El Paso County |
2,686 | 4 | 0 | |
|
East Dillon WD Summit County |
2,501 | 3 | 0 | |
|
Rangeview MD Arapahoe County |
2,487 | 3 | 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 | |
|
Aspen Ski CO Sundeck Pitkin County |
1,801 | 3 | 0 | |
|
Steamboat II MD Routt County |
1,450 | 8 | 1 | |
|
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 | |
|
Canterbury Park Colorado Springs · El Paso County |
1,240 | 3 | 0 | |
|
Edgemont Ranch MD La Plata County |
1,200 | 5 | 0 | |
|
Fowler Town of Otero County |
1,169 | 4 | 1 | |
|
Casa Estates MHP Adams County |
1,117 | 2 | 0 | |
|
Dallas Creek WC Ouray County |
1,059 | 4 | 0 | |
|
Loveland Valley Ski Area Clear Creek County |
1,020 | 3 | 0 | |
|
Cloverleaf Colorado LLC Larimer County |
1,007 | 3 | 0 | |
|
Homestead WC Jefferson County |
1,000 | 4 | 0 | |
|
Longview MHP Weld County |
1,000 | 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.