Douglas County tap water
0 of 11 water systems serving Douglas County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 28 community water systems list this county as served; 11 serve 3,300+ people with full PFAS testing.
- 4 had a health-based violation since 2021-10-26.
Largest systems serving this county
| System | Source | People served (whole system) | PFAS above a 2024 level? | Violations since 2021-10-26 |
|---|---|---|---|---|
| Castle Rock Town of | Surface water | 110,298 | No | 0 |
| Highlands Ranch Wsd | Surface water | 103,444 | No | 0 |
| Parker Wsd | Surface water | 75,949 | No | 0 |
| Meridian Md | Purchased surface water | 23,415 | No | 0 |
| Stonegate Md | Purchased surface water | 15,295 | No | 0 |
| Roxborough Wsd | Surface water | 13,765 | No | 0 |
| Pinery Wwd | Purchased surface water | 12,901 | No | 0 |
| Cottonwood Wsd | Purchased surface water | 10,867 | No | 0 |
| Northern Douglas County Wsd | Purchased surface water | 6,160 | No | 0 |
| Castle Pines Village Md | Groundwater | 5,656 | No | 0 |
| Perry Park Wsd | Groundwater under surface influence | 3,890 | No | 0 |
Which one is yours? A county usually has several utilities. Your bill or your utility's annual water-quality report names yours. Population is for the whole system, which can cross county lines.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.