Lancaster County tap water
10 of 19 water systems serving Lancaster County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 98 community water systems list this county as served; 19 serve 3,300+ people with full PFAS testing.
- 22 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 Lancaster | Surface water | 120,000 | Yes | 1 |
| Columbia Water CO | Surface water | 25,200 | No | 0 |
| Ephrata Area Joint Authority | Surface water | 24,500 | Yes | 0 |
| East Hempfield Water Auth | Purchased surface water | 20,988 | Yes | 1 |
| Elizabethtown Area Water | Surface water | 19,000 | Yes | 0 |
| Mt Joy Boro Auth | Groundwater under surface influence | 15,261 | No | 0 |
| Lititz Boro | Groundwater under surface influence | 9,397 | No | 0 |
| Warwick Twp Lititz Sys | Purchased groundwater (surface influence) | 8,561 | No | 0 |
| New Holland Borough | Groundwater | 8,490 | Yes | 0 |
| Millersville Univ | Groundwater | 7,950 | Yes | 0 |
| Upper Leacock Township | Purchased surface water | 7,734 | Yes | 1 |
| East Cocalico Township Auth | Groundwater under surface influence | 6,735 | Yes | 1 |
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.