The ladder
License classes
| Class | What it authorizes | Path |
|---|---|---|
| Trainee | Assist with installations under direct supervision of a journeyman or master (each supervisor limited to 3 trainees). | Application and employment with a licensed master or an entity employing one. |
| Journeyman-in-training | Work toward journeyman under a master’s supervision. | One academic year of approved plumbing instruction; license valid for a single non-renewable 4-year period. |
| Journeyman | Perform plumbing installations (not pull municipal permits in own right). | Roughly 2 years / 4,000 hours as a licensed trainee under a master (or 2,000 hours as a JIT within the 4-year window), plus the journeyman exam. |
| Master | Full scope: perform, supervise, and pull permits. | Experience as a journeyman plus the master exam. |
| Limited | Specified equipment or installation types only, as named on the license. | Board examination for the limited scope. |
Renewals run through OPOR’s fee rules; a license may be renewed late within 90 days, reinstated without re-examination up to 2 years, and requires a fresh application and exam after that. Maine has no blanket reciprocity — out-of-state licensees generally must meet Maine’s examination requirements, though the statute lets the board negotiate reciprocity with states holding equivalent standards.
Exceptions
Work that doesn’t require a plumbing license
Title 32 §3302 carves out a short list. Each is narrower than trades folklore suggests:
- Homeowners — plumbing in a single-family residence occupied or to be occupied as the person’s own bona fide abode, conforming to board laws and rules (permits and inspections still apply).
- Public utility employees — when working as such.
- Licensed oil and gas technicians (Title 32 Ch. 139) — but only hot and cold water connections to existing piping in the same room as the installation, not beyond any existing branch. The appliance side is theirs; the plumbing system is not.
- Licensed pump installers — piping from the pressure tank’s main shut-off to existing supply piping, same room, 15 feet maximum, no extension beyond existing branches.
- Well drillers / pump work in wells — governed by the Maine Water Well Commission’s code of performance rather than the plumbing license.
Plain-language guide, not legal advice. This site summarizes Maine plumbing statutes, board rules, and the adopted plumbing code for general information. Code editions, amendments, and fees change; municipalities may apply stricter local requirements. Always confirm current requirements with the Maine Plumbers’ Examining Board, your Local Plumbing Inspector (LPI), and the adopted code text before performing or specifying work.