Water quality
Pennsylvania water quality
According to the US EPA and the Pennsylvania Department of Environmental Protection (DEP), Pennsylvania has one of the largest counts of lead service lines in the country and has adopted state PFAS standards. EPA estimates Pennsylvania has roughly 689,000 lead service lines, among the most of any state, and DEP set state maximum contaminant levels for PFOA and PFOS in 2023. Most large systems meet federal standards, but lead pipes and PFAS are the most documented statewide concerns.
Documented considerations
Lead
According to the EPA, Pennsylvania has about 689,000 lead service lines - around 7.5 percent of all service lines and among the most of any US state - prompting large ongoing replacement programs.
PFAS
According to Pennsylvania DEP, the state set maximum contaminant levels of 14 ppt for PFOA and 18 ppt for PFOS in 2023; a 2025 USGS study reported PFAS detections in a majority of Pennsylvania rivers and streams sampled.
Disinfection byproducts
According to Pennsylvania water-quality reporting, disinfection byproducts such as trihalomethanes are commonly detected where surface water is chlorinated, a typical concern for systems drawing from rivers.
EPA compliance snapshot
From the EPA ECHO Safe Drinking Water Act database, Pennsylvania community water systems carrying one or more violations on record:
Most common violation categories
- Revised Total Coliform Rule (562)
- Public Notice (315)
- Groundwater Rule (221)
- Nitrate (201)
- Nitrite (195)
- TTHM (111)
Counts are public EPA ECHO figures. 'Health-based' means a system carries at least one health-based violation flag in ECHO. A violation on record is not a statement that current tap water is unsafe; most systems return to compliance. Always check your utility's Consumer Confidence Report for current status. Source: EPA ECHO, retrieved 2026-06-01.
Certified filters for Pennsylvania's main concerns
- 7.5Culligan US-EZ-4 Under-Sink
An under-sink filter genuinely IAPMO certified to NSF/ANSI 42, 53 and 401 for lead, cysts, VOCs, mercury and PFOA/PFOS.
- 7.2Aquasana AQ-5200 Under-Sink
Certified for lead and PFAS, cheap per gallon, marketing matches the certified scope.
- 7.2AquaTru Classic Countertop RO
A no-plumbing countertop 4-stage RO purifier certified to NSF standards for lead, PFAS, fluoride and arsenic with an efficient drain ratio.
- 4.9ZeroWater 5-Stage Pitcher (7-Cup)
A five-stage ion-exchange pitcher certified for lead, chromium-6 and PFOA/PFOS - but a short 15-gallon filter makes it costly to run.
- 7.3Brita Elite Pitcher (10-Cup)
A pour-through pitcher whose Elite filter is certified to reduce lead, mercury, cadmium and more, with a long 120-gallon cartridge.
- 6.8Frizzlife SK99 Under-Sink Filter
A direct-connect 3-stage under-sink filter with a 0.5 micron carbon block, IAPMO certified to NSF/ANSI 42 and 53 for chlorine, lead and chloramine.
FAQ
- Does Pennsylvania have a lot of lead pipes?
- According to the EPA, Pennsylvania has roughly 689,000 lead service lines, among the most of any state. Utilities including Pittsburgh Water and Aqua Pennsylvania are running large replacement programs, but homes with older service lines may benefit from a lead-certified filter in the meantime.
- What are Pennsylvania's PFAS limits?
- According to Pennsylvania DEP, the state set maximum contaminant levels of 14 ppt for PFOA and 18 ppt for PFOS in 2023. The EPA later finalized stricter federal limits of 4 ppt for both compounds in 2024.
- Is Pennsylvania tap water safe to drink?
- Most Pennsylvania public water systems meet federal and state standards. According to EPA and DEP, the most documented concerns are lead leaching from older service lines and PFAS in some systems, so residents can check their Consumer Confidence Report and filter accordingly.
Sources
- Pennsylvania DEP - PFAS in Pennsylvania
- LehighValleyNews - Pennsylvania lead pipe count
- Pittsburgh Water - PFAS and Your Water
Not sure how to read your local report? See our guide on reading a water quality report.