Massachusetts Plumbing Code: Massachusetts Uniform State Plumbing Code (248 CMR) 2023

Massachusetts follows Massachusetts Uniform State Plumbing Code (248 CMR) 2023 as the basis for plumbing work. Permits and inspections are issued by the local Authority Having Jurisdiction (AHJ), which may publish additional amendments.

Massachusetts uses its own 248 CMR code, not the IPC or UPC verbatim. Treat IPC/UPC selection as approximate and verify fixture-unit values against 248 CMR.