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Tap water

Pennsylvania: drinking water systems

The 1,849 active community water systems in Pennsylvania on EPA's record, serving 11,466,690 people (EPA's counts). Systems serving more than 500 people have their own page; find yours by name, city, county, ZIP code or PWS ID. EPA's file dated Oct. 23, 2026.

365

365 of 1,849 systems have a health-based violation on EPA's record since Oct. 23, 2023, serving 2,067,441 of the state's 11,466,690 people (18%); 53 are an EPA enforcement priority. EPA lists 69 as currently in violation (EPA's system file of Oct. 23, 2026).

Health-based violations, in EPA's words: “Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.”

Find your water system

    Health-based violations since Oct. 23, 2023, by contaminant or rule

    Groundwater Rule392TTHM141Revised Total Coliform Rule104Total Haloacetic Acids (HAA5)87Lead and Copper Rule33Arsenic29Surface Water Treatment Rule23Interim Enhanced Surface Water Treatment Rule21

    Cities and counties EPA lists, A to Z

    The cities EPA lists as served by each system, with the number of systems that list each; a system for which EPA lists no city is under its county.

    Adams (county) 35Allegheny (county) 39Armstrong (county) 22Beaver (county) 30Bedford (county) 25Berks (county) 77Blair (county) 25Bradford (county) 22Bucks (county) 70Butler (county) 40Cambria (county) 36Carbon (county) 29Centre (county) 43Chester (county) 67Clarion (county) 14Clearfield (county) 17Clinton (county) 16Columbia (county) 18Crawford (county) 43Cumberland (county) 27Dauphin (county) 28Elk (county) 8Erie (county) 41Fayette (county) 19Franklin (county) 30Greene (county) 3Huntingdon (county) 21Indiana (county) 17Jefferson (county) 11Juniata (county) 13Lackawanna (county) 33Lancaster (county) 98Lawrence (county) 18Lebanon (county) 30Lehigh (county) 42Luzerne (county) 74Lycoming (county) 32McKean (county) 17Mercer (county) 33Monroe (county) 68Montgomery (county) 38Northampton (county) 46Northumberland (county) 11Perry (county) 25Pike (county) 42Potter (county) 9Schuylkill (county) 40Snyder (county) 16Somerset (county) 34Susquehanna (county) 22Tioga (county) 22Venango (county) 25Warren (county) 15Washington (county) 9Wayne (county) 40Westmoreland (county) 17Wyoming (county) 30York (county) 45

    Counties

    A page for each county EPA lists for three or more systems with a page of their own: the systems that serve it and how each stands on EPA's record.

    Adams County 35Allegheny County 39Armstrong County 22Beaver County 30Bedford County 25Berks County 77Blair County 25Bradford County 22Bucks County 70Butler County 40Cambria County 36Carbon County 29Centre County 43Chester County 67Clarion County 14Clearfield County 17Clinton County 16Columbia County 18Crawford County 43Cumberland County 27Dauphin County 28Elk County 8Erie County 41Fayette County 19Franklin County 30Greene County 3Huntingdon County 21Indiana County 17Jefferson County 11Juniata County 13Lackawanna County 33Lancaster County 98Lawrence County 18Lebanon County 30Lehigh County 42Luzerne County 74Lycoming County 32McKean County 17Mercer County 33Monroe County 68Montgomery County 38Northampton County 46Northumberland County 11Perry County 25Pike County 42Potter County 9Schuylkill County 40Snyder County 16Somerset County 34Susquehanna County 22Tioga County 22Venango County 25Warren County 15Washington County 9Wayne County 40Westmoreland County 17Wyoming County 30York County 45
    Water systems with a page of their own, A to Z (803)

    From EPA's Safe Drinking Water Information System (SDWIS), through EPA ECHO's drinking water system download. Health-based violations from EPA Envirofacts, downloaded Nov. 2, 2026. EPA's file dated Oct. 23, 2026. EPA: “All compliance and enforcement data displayed on ECHO are current as of the last official quarterly refresh of the source data system, SDWIS, which may lag by three to six months.” These are records of violations, not a test of your tap water today: your water system's annual Consumer Confidence Report has its test results. Names and values are shown as EPA writes them. EPA ECHO drinking water search.