Maine’s Master Plumber license is issued by the Maine Plumbers’ Examining Board in the Office of Professional and Occupational Regulation. The Master Plumber examination is administered by Prov, Inc. as a closed-book, computer-based sitting of 100 questions in 3 hours, passed at 75 percent, and examined on the Uniform Plumbing Code 2015 — with no candidate books in the room and only a proctor-provided printout of the Maine Plumbing Tables on the desk. The PassProfessor Maine Master Plumber program prepares licensed journeymen and qualifying trainees for that sitting.
This program is part of the expanding PassProfessor catalog — join the notify list and we’ll email you when enrollment opens.
A master examination that tests what the candidate carries in
Some plumbing examinations hand the candidate a library and test retrieval. Maine’s does the opposite. The Master Plumber examination is closed book: no reference on the candidate’s own list is permitted in the room, no candidate-printed tables may be brought in, and the single piece of paper the process supplies is a printout of the Maine Plumbing Tables 2015 UPC, provided by the proctor at the testing site. Everything else the candidate needs — sizing logic, venting rules, regulatory duties, fixture and drainage requirements — must be carried into the room as knowledge.
That design makes Maine’s master tier distinctive in two further ways. First, the passing standard is set higher than the journeyman floor beneath it: Maine statute provides that the passing grade on a master plumber license examination may not be less than 75 percent, and the examination is scored against a cutscore of 75 percent. Second, the tested code is not the code Maine currently installs under. The examination is keyed to the Uniform Plumbing Code 2015, while Maine’s installation standard has been the 2021 Uniform Plumbing Code since January 1, 2022. A candidate who prepares from current field practice alone prepares for the wrong book; a candidate who prepares as though books were allowed in the room prepares for the wrong room. This page states both facts plainly because the whole preparation strategy follows from them.
The licensing authority is the Maine Plumbers’ Examining Board, within the Office of Professional and Occupational Regulation in the Department of Professional and Financial Regulation, acting under Chapter 49 of Title 32 of the Maine Revised Statutes and the Board’s rules at 02-395 Code of Maine Rules. PassProfessor is independent and is not affiliated with the Maine Plumbers’ Examining Board, the Office of Professional and Occupational Regulation, or Prov, Inc.
The examination at a glance
| Item | Verified position |
|---|---|
| Credential | Maine Master Plumber |
| Regulator | Maine Plumbers’ Examining Board, Office of Professional and Occupational Regulation, Department of Professional and Financial Regulation — 32 M.R.S. Chapter 49; Board Rules 02-395 C.M.R. |
| Administrator | Prov, Inc., under contract with the Board; Board approval is required before scheduling — scores obtained without prior Board approval are null and void; computer-based at Prov facilities nationwide or remotely via Prov Examroom |
| Structure | 100 questions / 3 hours / CLOSED BOOK |
| In-room material | Only the proctor-provided printout of the Maine Plumbing Tables 2015 UPC; candidate books and candidate-printed tables are not allowed; a simple 4-function calculator is an approved item |
| Passing standard | 75 percent — the Master Plumber exam requires a 75% passing score and is scored against a cutscore of 75% |
| Tested edition | Uniform Plumbing Code 2015 (IAPMO) |
| Adopted edition | 2021 Uniform Plumbing Code, adopted by Board Rule 02-395 Chapter 4 effective January 1, 2022 as the installation standard — adopted is not tested; see the edition section below |
| Examination fee | $65, paid to Prov at scheduling |
| Practical component | None published for this credential — the examination as published is a closed-book, computer-based written examination |
| Administrator note | PassProfessor is independent and is not affiliated with the Maine Plumbers’ Examining Board, OPOR, or Prov, Inc. |
Tested is not adopted: UPC 2015 in the room, UPC 2021 on the site
Maine keeps its two code layers unusually clean, and candidates should keep them just as clean. The tested layer is the Uniform Plumbing Code 2015 for both the journeyman and master examinations. The bulletin reference list behind that layer names four items: Maine Plumbing Laws and Rules, 2016; the Maine Plumbing Tables 2015 UPC; Plumbing Basics for Contractors, 3rd Edition, 2014; and the Uniform Plumbing Code 2015 itself. Because the examination is closed book, that list functions as a study list rather than a bring-list — with the single tables exception handled by the proctor, as described above.
The adopted layer is the 2021 Uniform Plumbing Code, adopted by Board Rule 02-395 Chapter 4, effective January 1, 2022, as the standard for plumbing installations in Maine, subject to that chapter’s exclusions and amendments. Work installed in Maine answers to the 2021 code; answers given in the examination room answer to 2015. Neither the 2021 nor the 2018 edition of the UPC is an examination basis, and no other model code is listed as one. Preparation that respects the distinction — learning the 2015 provisions as the examination’s law while recognising where current installation practice has moved on — is not a refinement in Maine. It is the centre of the task.
Where the 100 questions sit
The published master outline sums to 100 questions, and its centre of gravity differs from a trade-knowledge paper in an instructive way. Drainage, Waste, Sanitary Venting carries 20 questions, the largest single block. General Regulations carries 18, and Water Supply Systems Including Backflow Prevention and Water Heaters carries another 18. General Knowledge carries 16. Together, regulations and systems knowledge account for the overwhelming majority of the paper before the smaller blocks are counted: Plumbing Fixtures 8, Traps and Interceptors 6, Indirect Waste 6, Specialty Venting 4, and Roof Drainage 4.
Read that distribution as a description of the master role as Maine examines it. The journeyman tier below — 80 questions in the same 3 hours, also closed book — establishes trade competence. The master paper adds twenty questions and spends its weight on the regulatory frame and on complete systems: how drainage and venting behave as one design, how water supply, backflow protection, and water heating interact, and what the laws and rules require of the licensee who takes responsibility for the installation. The 18-question General Regulations block deserves particular respect. In a closed-book room, regulations questions cannot be looked up; the candidate either knows the Maine duties or guesses at them, and 18 guesses is a failing strategy on a 75 percent standard.
Time is the other quiet pressure. One hundred questions in three hours allows one minute and forty-eight seconds per question, with no book to consult and no search time to hide in. That pace is comfortable for knowledge that is genuinely fluent and unforgiving for knowledge that is merely familiar. Maine preparation is therefore a fluency exercise in a way open-book preparation is not: sizing methods, venting configurations, and regulatory thresholds must be recallable, not recognisable.
Who may sit: two documented routes to the master room
Maine provides two examination routes to the master license, and Board approval must come before any scheduling — an examination sat without prior Board approval produces scores that are null and void, however well the candidate performed. Since January 1, 2024, license, examination, and renewal applications are made through the Board’s online system.
The first route is the journeyman route: a minimum of at least one year, with 2,000 hours, of work in the field of plumbing installations as a licensed journeyman plumber. The second route reaches the master examination without the journeyman licence as an intermediate credential: a minimum of at least four years, with 8,000 hours, of work in the field of plumbing installations as a licensed trainee plumber under the supervision of a licensed master plumber, or the equivalent. For ladder context, the journeyman tier beneath this one rests on at least two years and 4,000 hours as a licensed trainee under a master, or 2,000 hours as a journeyman-in-training within four years of that licensure.
Board approval carries a two-year discipline that candidates should plan around. An applicant who does not pass within the approval window, or who does not apply for licensure within two years of notification of a passing score, must reapply as a new applicant and retake the examination. The master license itself runs on a two-year term.
Fees, kept in their separate layers
The Prov examination fee for the Master Plumber examination is $65, paid to Prov at scheduling. That is the examination charge, and it is the only examination dollar figure this page prints: the sources require a Board application fee by reference but state no distinct dollar amount for it, and this page prints none rather than presenting a combined figure as though it were an application fee.
The Board’s license layer is separate and is stated separately so the two are never conflated: the master license fee is $200.00, with a criminal background check fee of $21.00; biennial renewal is $200.00; and a late fee of $50.00 applies up to 90 days. Those are licensing charges under the Board’s published schedule — not examination charges, and not amounts due to Prov.
Maine imposes no continuing education requirement for plumber license renewal under the statute, the Board’s rules, and the Board’s renewal pages as read for this program. Candidates who encounter an hours figure attached to Maine master renewal in secondary material should treat it as unconfirmed against those sources.
After a sitting: results and retakes inside the two-year window
Results are provided at the testing centre on completion and are available online around the clock through the candidate’s Prov account. The retake position in Maine is unusually open, and it is stated here exactly as the bulletin states it: failed plumber examinations can be retaken as often as is necessary during the two-year window. No minimum interval between attempts is stated in any primary source retrieved for this program, and no attempt cap is printed — a capped figure found in secondary material is not a Maine rule. Each retake is a new scheduled, paid examination at $65. One boundary is absolute: a candidate cannot retake an examination once they have passed it.
Scheduling changes follow Prov’s standard discipline: contact Prov at least three business days before the test date to cancel or reschedule; rescheduling by that deadline is free, while a no-show or late cancellation forfeits the examination fee.
What the PassProfessor program will cover
The PassProfessor Maine Master Plumber program is in the works as part of our expanding catalog of trade licensing preparation, and enrollment is not yet open. Because Maine’s sitting is closed book, the program is built as a recall-and-fluency program rather than a reference program. Drainage, waste, and sanitary venting receives the deepest treatment, matching its 20-question weight, followed by water supply, backflow prevention, and water heaters and by the general knowledge core. The 18-question General Regulations block is taught as its own subject — Maine plumbing laws and rules learned as duties the candidate can state without a book — rather than as background reading around the trade material. Fixtures, traps and interceptors, indirect waste, specialty venting, and roof drainage complete the outline, and the Maine Plumbing Tables are practised as the candidate will actually meet them: as the one provided aid in the room, used quickly and accurately for the sizing work they support.
Edition discipline runs throughout: material is keyed to the tested Uniform Plumbing Code 2015, with the adopted 2021 installation standard identified wherever a working master’s daily practice is likely to supply a newer answer than the examination expects. Timed rehearsal follows the real arithmetic of the sitting — 100 questions, three hours, nothing on the desk but the tables printout and an approved simple calculator. Every item is written from scratch against primary sources; no item is drawn from another provider’s material. The companion guide, the Maine Master Plumber Exam Guide, develops the outline, the two eligibility routes, and a closed-book study method in full.
Completing this program will confer no license and no Board approval. The Board alone licenses and approves candidates, Prov administers the examination for approved candidates, and applications are made through the Board’s online system.
Tell me when enrollment opens. Leave an email address and PassProfessor will write to you when the Maine Master Plumber program is ready — and only about this program. No date is promised, because the program will open when it meets the standard described above, not before.
Frequently asked questions
Is the Maine Master Plumber examination open book?
No. It is closed book. No candidate books are allowed in the room; the only in-room material is the printout of the Maine Plumbing Tables 2015 UPC provided by the proctor at the testing site.
How many questions are on the examination, and how long does it run?
100 questions in 3 hours, computer-based through Prov, at Prov facilities nationwide or remotely via Prov Examroom.
What score passes the Master Plumber examination?
75 percent. The examination requires a 75% passing score and is scored against a cutscore of 75%, and Maine statute provides that the passing grade on a master plumber license examination may not be less than 75%.
Which code edition is tested?
The Uniform Plumbing Code 2015. Maine’s installation standard is the 2021 Uniform Plumbing Code, effective January 1, 2022 — adopted is not tested.
Can I bring my own copy of the Maine Plumbing Tables?
No. Candidate printed versions are not allowed. The proctor provides the tables printout at the testing site.
What does the examination cost?
The Prov examination fee is $65, paid to Prov at scheduling. Board licensing charges are separate; the master license fee is $200.00 plus a $21.00 criminal background check fee.
What experience qualifies me for the Master examination?
Either at least one year with 2,000 hours as a licensed journeyman plumber, or at least four years with 8,000 hours as a licensed trainee plumber under a licensed master plumber, or the equivalent — with Board approval obtained before scheduling.
What happens if I sit without Board approval first?
Scores obtained without prior Board approval are null and void.
How often can I retake the examination?
Failed examinations can be retaken as often as is necessary during the two-year window, as a new scheduled examination at $65 each time. No minimum interval is stated in the primary sources. An examination once passed cannot be retaken.
Does Maine require continuing education for master plumbers?
No continuing education requirement for plumber license renewal was found in the statute, the Board’s rules, or the Board’s renewal pages.
Is there a hands-on practical?
No practical, drawing, or takeoff component is published for this credential. The examination as published is a closed-book, computer-based written examination with the proctor-provided tables printout.
Is PassProfessor affiliated with the Board or Prov?
No. PassProfessor is an independent preparation provider, not affiliated with the Maine Plumbers’ Examining Board, the Office of Professional and Occupational Regulation, or Prov, Inc.
When does enrollment open?
The program is in the works and enrollment is not yet open. Leave an email address on this page and PassProfessor will write to you when the program is ready — and only about this program.