All water systems in Colorado
2,218 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Denver Water Board Denver County |
1,287,000 | 3 | 0 | |
|
Aurora City of Arapahoe County |
533,407 | 0 | 0 | |
|
Colorado Springs Utilities El Paso County |
464,111 | 0 | 0 | |
|
Thornton City of Adams County |
226,465 | 2 | 0 | |
|
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 | |
|
Boulder City of Boulder County |
166,080 | 1 | 0 | |
|
Greeley City of Weld County |
132,310 | 2 | 0 | |
|
Pueblo Board of WW Pueblo County |
114,070 | 0 | 0 | |
|
Castle Rock Town of Douglas County |
110,298 | 1 | 0 | |
|
Broomfield City and County of Broomfield · Broomfield County |
106,153 | 1 | 0 | |
|
Longmont City of Boulder County |
104,178 | 0 | 0 | |
|
Highlands Ranch Wsd Douglas County |
103,444 | 0 | 0 | |
|
Ute Wcd Mesa County |
92,580 | 0 | 0 | |
|
Loveland City of Larimer County |
91,077 | 0 | 0 | |
|
Consolidated Mutual Maple Grove Jefferson County |
81,400 | 0 | 0 | |
|
Parker Wsd Douglas County |
75,949 | 4 | 0 | |
|
South Adams County Wsd Adams County |
75,559 | 0 | 0 | |
|
East Cherry Creek Valley Wsd Arapahoe County |
66,130 | 1 | 0 | |
|
FT Collins Loveland WD Larimer County |
63,532 | 0 | 0 | |
|
Englewood City of Arapahoe County |
59,904 | 1 | 0 | |
|
Brighton City of Adams County |
56,304 | 0 | 0 | |
|
Southgate Wsd Arapahoe County |
55,000 | 0 | 0 | |
|
Eagle River Wsd Eagle County |
51,515 | 0 | 0 | |
|
Green Mountain Wsd Jefferson County |
49,400 | 0 | 0 | |
|
Northglenn City of Adams County |
48,927 | 0 | 0 | |
|
Southwest Metropolitan Wsd Arapahoe County |
48,648 | 0 | 0 | |
|
US Department of the Army Fort Carson El Paso County |
48,000 | 1 | 0 | |
|
Erie Town of Boulder County |
47,444 | 0 | 0 | |
|
Bancroft Clover Wsd Jefferson County |
44,000 | 0 | 0 | |
|
Golden City of Jefferson County |
38,288 | 0 | 0 | |
|
Canon City City of Fremont County |
34,800 | 0 | 0 | |
|
Clifton WD Mesa County |
34,500 | 0 | 0 | |
|
Durango City of La Plata County |
33,787 | 0 | 0 | |
|
Aspen City of Pitkin County |
31,100 | 3 | 0 | |
|
Arapahoe Cnty Wwwa Arapahoe County |
31,000 | 0 | 0 | |
|
Bear Creek Wsd Jefferson County |
30,000 | 0 | 0 | |
|
Pueblo West MD Pueblo County |
30,000 | 3 | 0 | |
|
Cherokee MD El Paso County |
29,610 | 1 | 0 | |
|
Lafayette City of Boulder County |
28,700 | 4 | 0 | |
|
Breckenridge Town of Summit County |
28,315 | 4 | 0 | |
|
East Larimer County WD Larimer County |
27,944 | 1 | 1 | |
|
Firestone Town of Weld County |
27,798 | 0 | 0 | |
|
Widefield Wsd El Paso County |
27,640 | 2 | 0 | |
|
Csu Main and West Housing Campus Larimer County |
27,375 | 5 | 0 | |
|
Johnstown Town of Weld County |
27,295 | 1 | 0 | |
|
Grand Junction City of Mesa County |
26,000 | 2 | 0 | |
|
Little Thompson WD Larimer County |
25,654 | 0 | 0 | |
|
Fountain City of El Paso County |
25,130 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
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. Retrieved from ECHO on Oct 11, 2026.