State plumbing guide · PA
Plumbing in Pennsylvania
Pennsylvania builds under a statewide Uniform Construction Code, but Philadelphia keeps its own amended plumbing code. The state's older cities have some of the country's oldest housing, and cold winters add freeze risk to aging pipe.
- Median home built
- 1966
- Built before 1980
- 66%
- Owner-occupied
- 69%
- Winter
- Regular hard freezes
- General statewide rating
- Plumbing code
- IPC
- City guides
- 3
Housing figures: U.S. Census Bureau, ACS 2024 1-year (B25035, B25034).
Pennsylvania city plumbing guides
How to check a plumber's license in Pennsylvania
Pennsylvania has no statewide plumber license; licensing is handled by municipalities such as Philadelphia and Pittsburgh. [1]Awaiting verification
Pennsylvania's older housing stock
Statewide, the median home was built in 1966 and 66% of homes predate 1980. Homes like that were usually built with copper or galvanized supply, cast iron drains, clay or cast iron sewer laterals. The city guides below show how much that varies within the state.
Which plumbing code applies in Pennsylvania
Pennsylvania's Uniform Construction Code, administered by the Department of Labor and Industry, adopts International Code Council codes statewide. Its latest triennial update took effect January 1, 2026. [2]
Philadelphia uses its own Philadelphia Plumbing Code, based on the 2018 International Plumbing Code with city amendments approved by the state Department of Labor and Industry. [3]
Seasonal problems to plan for in Pennsylvania
- Winter
- Frozen pipes in exterior walls, unheated basements and crawl spaces; outdoor faucets left connected to hoses. See frozen pipe repair.
- Summer storms
- Heavy rain on older combined sewers can push water into basements. See sewer backup.
Regions of Pennsylvania
Southeastern Pennsylvania
Philadelphia's rowhouse neighborhoods, river water sources and a very old housing stock.
Pennsylvania plumbing questions
Does Philadelphia follow Pennsylvania's statewide code for plumbing?
Philadelphia uses its own Philadelphia Plumbing Code, based on the 2018 IPC with city amendments approved by the state. The rest of Pennsylvania builds under the statewide Uniform Construction Code.
Who licenses plumbers in Pennsylvania?
Licensing is local rather than statewide in Pennsylvania. Ask the plumber which municipal license they hold, and confirm it with that city.
Sources (4)
- U.S. Census Bureau, ACS 2024 1-year (B25035, B25034) · checked 2026-10-01
- Secondary sources; confirm with PA Department of Labor and Industry
- Pennsylvania Department of Labor and Industry, Uniform Construction Code · checked 2026-10-01
- City of Philadelphia, 2018 Philadelphia Plumbing Code amendments · checked 2026-10-01