Williamson County tap water
0 of 16 water systems serving Williamson County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 37 community water systems list this county as served; 15 serve 3,300+ people with full PFAS testing.
- 5 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 Georgetown | Surface water | 191,639 | No | 1 |
| City of Round Rock | Surface water | 130,662 | No | 0 |
| City of Leander | Surface water | 98,330 | No | 0 |
| City of Cedar Park | Surface water | 86,939 | No | 0 |
| Jonah Water Sud | Purchased surface water | 29,861 | No | 0 |
| City of Hutto | Purchased surface water | 29,580 | No | 0 |
| City of Taylor | Purchased surface water | 20,622 | No | 0 |
| Brushy Creek Mud | Surface water | 18,314 | No | 0 |
| Sonterra Mud | Purchased surface water | 16,614 | No | 0 |
| Jarrell Schwertner Wsc | Purchased surface water | 9,681 | No | 0 |
| Williamson County Wsid 3 | Purchased groundwater | 8,265 | No | 0 |
| Williamson Travis County Mud 1 | Purchased surface water | 5,793 | 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.