Water quality · Pennsylvania
Water quality in Pennsylvania
Of the 6 Pennsylvania ZIPs matched to an EPA SDWIS community water system, none reports a health-based violation in the last 3 years, though 6 carry at least one non-health-based violation. 4 further ZIPs have no water-system record on zipradar yet. That is a gap in our records, not a sign that the water is untested. SDWIS reports the system serving the county, never an address-level test, and never private wells.
Last verified 2026-09-24 · methodology
Water quality by ZIP code in Pennsylvania
The largest community water system EPA lists for each ZIP's county, and its health-based violations in the last 3 years.
| ZIP | Largest system | Health-based violations |
|---|---|---|
| 19103PhiladelphiaPhiladelphia County | PHILADELPHIA WATER DEPARTMENT | None |
| 15222PittsburghAllegheny County | PITTSBURGH WATER & SEWER AUTH | None |
| 17101HarrisburgDauphin County | No record yet | |
| 16801State CollegeCentre County | STATE COLLEGE BORO WATER AUTH | None |
| 15217Pittsburgh (Squirrel Hill)Allegheny County | PITTSBURGH WATER & SEWER AUTH | None |
| 17013CarlisleCumberland County | CARLISLE WATER TRMT PLT | None |
| 19610WyomissingBerks County | No record yet | |
| 15601Greensburg (PA)Westmoreland County | No record yet | |
| 17110Harrisburg (PA)Dauphin County | No record yet | |
| 18103Allentown (PA)Lehigh County | LCA ALLENTOWN DIVISION | None |
County-level figures from EPA SDWIS, joined to each ZIP by county. None of them is a measurement at a specific address.
What lands here
Pages show the largest community water system on record for the ZIP's county, its PWSID and population served, and its health-based and total violations in the last 3 years. Lead and copper sampling results are not shown; your utility's annual water quality report (CCR) has them.
Source & refresh
EPA SDWIS. Refreshed quarterly (federal mandate). Primary source →
Pennsylvania top concern
Radon, lead pipes (older cities)
Pennsylvania has Zone 1 radon across most of the state. LCRR lead-service-line obligations in Philadelphia, Pittsburgh, Reading, Allentown, Erie. EPA SDWIS small-system compliance varies.
See Pennsylvania state page for the full state-level rollup across all 12 dimensions.
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