County · Colorado
Douglas County, Colorado: drinking water records
This overview covers 14 ZIP codes and 29 community water systems in Douglas County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Roxborough WSD CO0118055 | 13,765 | 120 | 0 | 1 | 5 ppb |
| Pinery Wwd CO0118025 | 12,901 | 420 | 4 | 1 | 0 ppb |
| Castle Rock Town of CO0118010 | 110,298 | 360 | 2 | 0 | 2 ppb |
| Highlands Ranch WSD CO0118015 | 103,444 | 210 | 4 | 0 | 2 ppb |
| Parker WSD CO0118040 | 75,949 | 780 | 5 | 0 | 2 ppb |
| Meridian Md CO0218015 | 23,415 | 240 | 0 | 0 | 0 ppb |
| Stonegate Md CO0118076 | 15,295 | 120 | 6 | 0 | 2 ppb |
| Castle Pines North Md CO0118006 | 12,800 | 90 | 4 | 0 | 0 ppb |
| Cottonwood WSD CO0118020 | 10,867 | 180 | 5 | 0 | 0 ppb |
| Northern Douglas County WSD CO0118016 | 6,160 | 120 | 4 | 0 | 0 ppb |
| Castle Pines Village Md CO0118005 | 5,656 | 120 | 0 | 0 | 2 ppb |
| Perry Park WSD CO0118045 | 3,890 | 240 | 0 | 0 | 1 ppb |
| Beverly Hills Mutual Wc CO0118001 | 325 | 0 | 0 | 1 | 3 ppb |
| Larkspur Town of CO0118030 | 275 | 0 | 0 | 8 | 1 ppb |
| Northway MHP NY1701509 | 250 | 0 | 0 | 1 | 0 ppb |
| Louviers WSD CO0118035 | 238 | 0 | 0 | 18 | 0 ppb |
| Westcreek Lakes WD CO0118085 | 165 | 0 | 0 | 8 | 2.1 ppb |
| View Ridge Mutual Wc CO0118080 | 35 | 0 | 0 | 1 | 2 ppb |
| Sterling Ranch Cab CO0118724 | 11,501 | 0 | 0 | 0 | 0 ppb |
| Consolidated Bell Mtn Ranch Md CO0118002 | 1,162 | 0 | 0 | 0 | 0 ppb |
| Roxborough Nw Douglas County CO0118070 | 860 | 0 | 0 | 0 | 5.8 ppb |
| Thunderbird WSD CO0118078 | 490 | 0 | 0 | 0 | 5 ppb |
| Chatfield South WD CO0118175 | 312 | 0 | 0 | 0 | 0 ppb |
| Silver Heights WSD CO0118075 | 301 | 0 | 0 | 0 | 1.5 ppb |
| Sedalia WSD CO0118060 | 215 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Douglas County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.