Montgomery County tap water
12 of 15 water systems serving Montgomery County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 38 community water systems list this county as served; 15 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 |
|---|---|---|---|---|
| Aqua PA Main System | Surface water | 822,600 | Yes | 1 |
| North Penn Water Authority | Purchased surface water | 91,941 | Yes | 0 |
| PA American Norristown | Surface water | 88,885 | No | 0 |
| North Wales Water Authority | Surface water | 72,496 | Yes | 0 |
| Pottstown Borough Water Auth | Surface water | 36,000 | No | 2 |
| Horsham Water&sewer Authority | Purchased surface water | 26,000 | Yes | 0 |
| Ambler Boro Water dept | Surface water | 20,000 | Yes | 0 |
| Aqua PA Hatboro | Purchased surface water | 12,901 | Yes | 0 |
| Aqua PA Superior Main System | Purchased surface water | 11,400 | Yes | 0 |
| Collegeville Trappe Joint Pwd | Groundwater | 8,470 | Yes | 0 |
| PA American Audubon | Purchased surface water | 8,200 | Yes | 0 |
| Telford Borough Authority | Purchased surface water | 7,700 | Yes | 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.