Maine plumbing code: which edition applies and what it requires
Maine uses the Uniform Plumbing Code (UPC). The current edition is 2021 UPC, effective 2022-01-01, adopted by the Maine Plumbers Examining Board (OPOR), 32 MRS ch 49 and enforced by the local authority having jurisdiction (AHJ).
Maine plumbing code at a glance
| Adopted code | Maine adopts the UPC (02-395 CMR ch 4), NOT state-written |
|---|---|
| Code family | UPC |
| Current edition | 2021 UPC |
| Effective date | 2022-01-01 |
| Adopting authority | Maine Plumbers Examining Board (OPOR), 32 MRS ch 49 |
| Trap seal protection | Addressed in Chapter 10 (Traps); barrier-type floor drain devices conform to ASSE 1072 (UPC Section 1007). |
| Waterless trap seal acceptance | The UPC recognizes barrier-type floor drain trap seal protection devices (ASSE 1072) as a trap seal protection method (UPC Section 1007). Whether one serves in lieu of a trap primer is an AHJ decision. Confirm with the AHJ. |
| Local amendments / enforcement | Statewide single code; ME excludes UPC Ch12/13/appendices but ADOPTS Ch10 (traps) |
This page summarizes how Maine adopts and applies its plumbing code. It is a reference for planning, not legal or code-compliance advice. Always confirm current requirements with the adopted code text and your local AHJ.
Does Maine use the IPC or the UPC?
Maine uses the UPC. Its plumbing code is based on the Uniform Plumbing Code published by IAPMO, not the International Plumbing Code.
The adopted code is the Maine adopts the UPC (02-395 CMR ch 4), NOT state-written, which uses the UPC as its base with state amendments. Maine is one of the states in the UPC family.
What edition of the plumbing code does Maine use, and when did it take effect?
Maine's current edition is 2021 UPC, effective 2022-01-01, adopted by the Maine Plumbers Examining Board (OPOR), 32 MRS ch 49.
Codes update on a multi-year cycle, and an adopted-but-not-yet-effective edition can circulate near a changeover. Confirm which edition your project falls under by its permit date and your local jurisdiction.
How do local jurisdictions affect Maine's plumbing code?
Maine's code is the statewide baseline, but local jurisdictions enforce it and may add amendments. The local authority having jurisdiction (AHJ) resolves how it applies to a specific project.
Statewide single code; ME excludes UPC Ch12/13/appendices but ADOPTS Ch10 (traps). Confirm any local amendments and the accepted trap-seal methods with your city or county building department before relying on a provision.
What does the plumbing code require for floor drains and trap seals?
Floor drains rely on a trap, and the code requires that trap seal to be maintained. A floor drain that receives little water can lose its seal to evaporation, which opens a path for sewer gas, odors, and pests.
To prevent that, codes recognize trap seal protection methods. The two most common are a trap seal primer (which adds water to the trap) and a barrier-type floor drain trap seal protection device (which provides a mechanical seal). The right approach depends on the drain, the space, and the AHJ.
In Maine, the requirement is in the traps chapter of the adopted code (UPC Section 1007). The UPC recognizes a barrier-type device conforming to ASSE 1072 as a trap seal protection method; whether one stands in for a trap primer is decided by the AHJ.
Are barrier-type (ASSE 1072) trap seals allowed under Maine's code?
Yes, as a recognized method. The UPC recognizes barrier-type floor drain trap seal protection devices conforming to ASSE 1072 (UPC Section 1007). Whether a barrier device serves in lieu of a trap primer is a decision for the AHJ under the UPC's trap-seal requirement.
Note that a restrictive "shall not be used in lieu of" clause some references show is an Oregon amendment, not part of the base UPC, so it does not apply here. As with any device, acceptance for a specific installation rests with the local AHJ.
Do I need a permit to add a floor-drain trap seal in Maine?
Usually not for the device itself, but always confirm with your local authority having jurisdiction.
A drop-in barrier-type trap seal device generally does not require a plumbing permit because it does not alter any piping, similar to changing a drain grate. On new construction or an already-permitted renovation, include it in the plumbing specifications.
In Maine, plumbing permits and inspections run through Maine Plumbers Examining Board and the local building department, and a licensed plumber pulls permits for plumbing work. Licensing rules and reciprocity vary, so confirm them with the authority or your local jurisdiction.
Where can I read Maine's plumbing code?
The adopting authority and code text are linked below. Always confirm current requirements against the adopted code and your local AHJ.
Where Green Drain fits. Green Drain is a barrier-type waterless trap seal for floor drains. It is cUPC listed through IAPMO (File No. 9301) and tested to ASSE 1072-2020, the standard this code references for these devices. For a floor drain at risk of a dry trap, it is one code-recognized way to keep the trap seal intact, and it works alongside the existing P-trap rather than replacing it.
Acceptance for any specific installation rests with your local AHJ. See Green Drain certifications for listing details, or browse waterless trap seals by drain size.
Protecting floor drains in Maine?
Find the right waterless trap seal for your drain size, or talk to our team about a project.