Colorado
Douglas County drinking water quality
74 active public water systems serve 421,295 people in Douglas County. 35 are compliant, 39 had at least one EPA violation in the past three years, 0 are designated serious violators, and 1 carries a health flag.
Needs attention
Community water systems
29 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Castle Rock Town of |
110,298 | 1 | 0 | |
|
Highlands Ranch Wsd |
103,444 | 0 | 0 | |
|
Parker Wsd |
75,949 | 4 | 0 | |
|
Meridian MD |
23,415 | 3 | 0 | |
|
Stonegate MD |
15,295 | 0 | 0 | |
|
Roxborough Wsd |
13,765 | 0 | 0 | |
|
Pinery Wwd |
12,901 | 1 | 0 | |
|
Castle Pines North MD |
12,800 | 1 | 0 | |
|
Sterling Ranch Cab |
11,501 | 2 | 0 | |
|
Cottonwood Wsd |
10,867 | 7 | 0 | |
|
Northern Douglas County Wsd |
6,160 | 0 | 0 | |
|
Castle Pines Village MD |
5,656 | 1 | 0 | |
|
Perry Park Wsd |
3,890 | 3 | 0 | |
|
Consolidated Bell Mtn Ranch MD |
1,162 | 1 | 0 | |
|
Roxborough NW Douglas County |
860 | 0 | 0 | |
|
Thunderbird Wsd |
490 | 1 | 1 | |
|
Beverly Hills Mutual WC |
325 | 1 | 0 | |
|
Chatfield South WD |
312 | 0 | 0 | |
|
Silver Heights Wsd |
301 | 0 | 0 | |
|
Larkspur Town of |
275 | 4 | 1 | |
|
Louviers Wsd |
238 | 3 | 0 | |
|
Sedalia Wsd |
215 | 1 | 0 | |
|
Castle Park MHP |
191 | 3 | 0 | |
|
Westcreek Lakes WD |
165 | 8 | 2 | |
|
Foxhill MD |
123 | 0 | 0 | |
|
Sierra Vista HOA |
120 | 0 | 0 | |
|
Solitude MD |
40 | 0 | 0 | |
|
View Ridge Mutual WC |
35 | 3 | 1 | |
|
Dominion Wsd Littleton |
0 | 0 | 0 |
Non-community systems (45: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (53, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.