Tap Truth EPA drinking water records, in plain English

County drinking water records

Douglas County, CO drinking water systems

25 community water systems serve Douglas County, CO, reporting 449,440 people served in all. A system that also serves other counties counts all of its customers here.

7 of them (28%) had at least one health-based violation in the last 10 years. 3 systems still have one unresolved.

9 rely mainly on groundwater and 16 on surface water, counting water bought from other systems.

23 systems filed a lead service line inventory listing 0 lead lines, 0 galvanized lines that must be replaced and 82 lines of unknown material.

4 more systems are placed in Douglas County, CO by the county their records name because they have no service area map that lines up with their own records, so they are listed apart and not counted here.

Community water systems
25
People served, sum of each system's own figure
449,440
Systems with a health-based violation, last 10 years
7
Systems with one unresolved
3
Lead service lines in inventories
0

Water systems serving Douglas County

25 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Town of Castle Rock Castle Rock 106,822 Surface water 0 0 0
Highlands Ranch WSD Highlands Ranch 103,444 Surface water 0 0 0
Parker WSD Parker, Castle Pines and 2 more 75,949 Surface water 0 0 0
Southgate WSD Centennial, Lone Tree and 2 more 55,000 Purchased surface water 0 0 No inventory
Meridian MD Meridian, Stepping Stone and 1 more 23,415 Purchased surface water 0 0 0
Stonegate MD Stonegate 15,295 Purchased surface water 0 0 0
Roxborough WSD Roxborough Park 13,765 Surface water 1 0 0
Pinery WWD The Pinery 12,901 Purchased surface water 1 0 0
Castle Pines North MD Castle Pines 12,800 Purchased surface water 0 0 0
Cottonwood WSD Parker 10,867 Purchased surface water 0 0 0
Northern Douglas County WSD Highlands Ranch 6,160 Purchased surface water 0 0 0
Castle Pines Village MD Castle Pines Village 5,656 Groundwater 0 1 0
Perry Park WSD Perry Park and land outside it 3,890 Groundwater under direct influence 0 0 0
Consolidated Bell Mtn Ranch MD Outside cities and towns 1,000 Groundwater 0 0 0
Thunderbird WSD Outside cities and towns 490 Groundwater 0 0 0
Beverly Hills Mutual WC Outside cities and towns 325 Groundwater 1 0 0
Chatfield South WD Outside cities and towns 312 Purchased surface water 0 0 0
Silver Heights WSD Outside cities and towns 301 Groundwater 0 0 0
Town of Larkspur Larkspur 275 Groundwater 8 0 0
Louviers WSD Louviers 238 Groundwater 18 0 0
Sedalia WSD Sedalia and Louviers 215 Groundwater under direct influence 0 0 0
Westcreek Lakes WD Westcreek 165 Groundwater under direct influence 8 4 0
Sierra Vista HOA Outside cities and towns 120 Groundwater 0 0 0
View Ridge Mutual WC Outside cities and towns 35 Groundwater 1 3 0
Dominion WSD Sterling Ranch Not reported Purchased surface water 0 0 No inventory

Systems placed by county record in Douglas County

4 systems

EPA has no service area map for some of these systems, and the maps it has for the others do not line up with their own records. They are placed by the county their records name (the counties EPA lists them serving, or the county coded in their IDs where EPA lists none), and without a map they are not counted in the figures above.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Sterling Ranch Cab County on record 11,357 Purchased surface water 0 0 0
Roxborough NW Douglas County County on record 860 Purchased surface water 0 0 0
Castle Park MHP County on record 191 Purchased surface water 0 0 No inventory
Foxhill MD County on record 123 Groundwater 0 0 0

Cities and towns in Douglas County

20 places

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Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations