Pennsylvania tap water
85 of 357 Pennsylvania water systems with full PFAS testing (24%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 1,849 active community water systems in the EPA file; 324 serve 3,300+ people and have a full PFAS set.
- 445 systems had at least one health-based violation since 2021-10-26.
- 415 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Philadelphia Water department | 1,600,000 | Yes, at one or more sampling points | 0 |
| Aqua PA Main System | 822,600 | Yes, at one or more sampling points | 1 |
| PA Amer Water Co-Pittsburgh | 686,000 | No | 0 |
| Pittsburgh Water & Sewer Auth | 520,000 | No | 0 |
| Erie City Water Authority | 220,001 | No | 0 |
| York Water CO | 206,762 | No | 1 |
| West View Water Authority | 200,000 | No | 0 |
| Mawc Sweeney Plant | 143,000 | No | 0 |
Counties
Allegheny County25 systems with full PFAS testingBucks County22 systems with full PFAS testingLancaster County19 systems with full PFAS testingBerks County18 systems with full PFAS testingMontgomery County15 systems with full PFAS testingYork County12 systems with full PFAS testingChester County11 systems with full PFAS testingSchuylkill County11 systems with full PFAS testingErie County10 systems with full PFAS testing
All 48 utilities with a page in Pennsylvania
- Altoona Water Authority 62,500
- Aqua PA Bensalem 59,001
- Aqua PA Main System 822,600
- Aqua PA Roaring Creek Division 43,000
- Aqua PA Shenango Valley Wtp 48,000
- Aqua PA West Chester 48,600
- Bcwsa Main Lower South 52,621
- Beaver Falls Muni Auth 49,500
- Capital Region Water 66,540
- Chester Water Authority 140,437
- City of Bethlehem 117,259
- City of Lancaster 120,000
- Cranberry Twp Wtp 42,000
- Easton Area Water System 96,867
- Erie City Water Authority 220,001
- Greater Johnstown WA Riverside 49,500
- Hampton Shaler Water Authority 61,949
- Hca Hazleton Division 45,000
- Lca Allentown Division 118,000
- Lca Wlsa Central Division 47,693
- Lebanon Water Auth 57,000
- Lower Bucks CO Joint Mun Auth 63,007
- Mawc Sweeney Plant 143,000
- Monroeville Municipal Auth 48,500
- New Kensington Muni Auth 47,800
- North Penn Water Authority 91,941
- North Wales Water Authority 72,496
- PA Amer Water CO 50,200
- PA Amer Water CO Lake Scranton 137,142
- PA Amer Water CO New Castle 43,279
- PA Amer Water Co-Pittsburgh 686,000
- PA American Norristown 88,885
- PA American Royersford 49,508
- PA American Water CO Butler 43,286
- PA American Water CO West 105,127
- Paw Ceasetown 58,467
- Paw Nesbitt 52,640
- Paw Watres 52,002
- Philadelphia Water department 1,600,000
- Pittsburgh Water & Sewer Auth 520,000
- Reading Area Water Authority 95,100
- State College Boro Water Auth 72,000
- Veolia Mechanicsburg 45,013
- Veolia Water 110,000
- West View Water Authority 200,000
- Wilkinsburg-Penn Jt Water Auth 125,000
- Williamsport Mun Water Auth 51,000
- York Water CO 206,762
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
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.