Denton County tap water
0 of 26 water systems serving Denton County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 81 community water systems list this county as served; 24 serve 3,300+ people with full PFAS testing.
- 14 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 |
|---|---|---|---|---|
| City of Denton | Surface water | 150,037 | No | 0 |
| City of Lewisville | Surface water | 140,880 | No | 0 |
| Mustang Sud | Purchased surface water | 127,911 | No | 0 |
| Town of Flower Mound | Purchased surface water | 80,000 | No | 0 |
| City of the Colony | Purchased surface water | 45,367 | No | 0 |
| Town of Little Elm | Purchased surface water | 43,348 | No | 0 |
| City of Corinth | Purchased surface water | 23,213 | No | 0 |
| Lake Cities Municipal Utility Authority | Purchased surface water | 17,826 | No | 0 |
| City of Highland Village | Purchased surface water | 16,500 | No | 0 |
| Trophy Club Mud 1 | Purchased surface water | 13,649 | No | 0 |
| Denton County Fwsd 7 | Purchased surface water | 12,837 | No | 0 |
| Argyle Wsc | Purchased surface water | 12,720 | 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.