Massachusetts Master Plumber Exam Prep

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Massachusetts Master Plumber exam at a glance

The Massachusetts Master Plumber exam has 80 questions and a time limit of 2 hours 40 minutes, and it is closed book. That works out to about 2 minutes per question. The passing score is 70%. Figures are from the official candidate bulletin, checked October 10, 2026.

Questions80
Time2 hours 40 minutes
Passing score70%
BookClosed book

Confirm question count, time, open-book rules, and passing score on the live board bulletin before you sit. We do not guarantee a passing result. Source: Board CIB dated 10/3/2025, checked October 10, 2026. How we source exam facts

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What’s included

20,000+ word study guide

Worked calculations, code-section breakdowns, exam traps, a key-terms glossary and a 30/60/90-day plan.

4 full-length practice exams

Original questions weighted to match the topic mix of the real exam.

400 practice questions

Every one with a written explanation and the code section behind the answer.

Same study guide and four exams on every term. You are choosing how long you can log in.

Instant accessSecure checkoutBuilt on current codes
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What this prep covers

  1. About the Massachusetts Master Plumber license
  2. How Massachusetts licensing works
  3. Plumbing math and fundamentals
  4. How the plumbing code is organized
  5. Sanitary drainage, waste, and vent (DWV)
  6. Venting
  7. Water supply and distribution
  8. Fixtures, traps, and interceptors
  9. Water heaters, relief, and gas
  10. Backflow prevention and cross-connection control
  11. Fixtures required by occupancy, clearances, and accessibility
  12. Materials, joining, and storm drainage
  13. Inspection, testing, and isometrics
  14. Worked calculations
  15. Sample exam questions, solved
  16. Common mistakes and exam traps
  17. Key chapters and tables to tab
  18. Glossary of must-know terms
  19. Your 30 / 60 / 90 day study plan
  20. Exam-day strategy

Massachusetts Master Plumber licensing, explained

About the Massachusetts Master Plumber license

Massachusetts licenses plumbers through the Board of State Examiners of Plumbers and Gas Fitters. The Master Plumber is the senior plumbing credential. It generally requires you to first hold a journeyman plumber license, accumulate additional documented experience as a licensed journeyman, and pass a more demanding exam that adds system design, sizing, and code administration. A master may design plumbing systems, pull permits, supervise journeymen and apprentices, and serve as the qualifying individual for a licensed plumbing contractor.

Your exam is built on the Massachusetts Uniform State Plumbing Code (248 CMR 10.00) — Massachusetts writes and enforces its own state plumbing code and does not adopt the IPC or UPC. The PSI bulletin dated October 3, 2025 lists 248 CMR 10.00 through 10.23, 2023 edition, as a codebook used to write the exam, and that book is not allowed in the center. Do not sit a later printing the bulletin does not name. Confirm the live bulletin the week you schedule. The two model codes — the Uniform Plumbing Code (UPC) published by IAPMO and the International Plumbing Code (IPC) published by the ICC — agree on the physics but differ in tables, fixture-unit values, and some sizing methods, so always work from the one your state adopted.

Know these scope facts cold: the license is held by the individual; most work requires a permit and inspection (rough-in/top-out and final); you must work within the classification you hold; and unlicensed or out-of-scope plumbing work is a violation that can cost you the license and carry penalties. Plumbing protects public health — the exam constantly returns to the two core purposes of the code: deliver safe potable water and remove waste without contaminating that water.

How Massachusetts licensing works

  • Experience: at least one year, with a minimum of 1,700 hours, of practical experience as a Massachusetts-licensed journeyman plumber — on top of whatever experience you already logged earning the journeyman license itself.
  • Education: 110 hours of Board-approved advanced plumbing theory instruction (the master tier of the Plumber Educational Program), unless already satisfied through an approved apprenticeship program.
  • Application: submit the application, fees, and proof of experience (often signed off by a master plumber or employer) before you are approved to sit.
  • Exam vendor: PSI. The written exam is commonly 80 questions with a 160-minute time limit, closed book, with a passing score of 70 percent. Master licensure also includes a separate practical/skills component. Confirm the current format, question count, time limit, and cut score on your candidate information bulletin, since these can change.
  • Renewal: licenses renew on a fixed cycle and usually require continuing education, including code-update hours when a new code edition is adopted.

This is the opening of the full study guide. The complete guide continues into code navigation, worked calculations and solved exam questions.

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Common questions about this exam

How many questions are on the Massachusetts Master Plumber exam?

The Massachusetts Master Plumber exam has 80 questions and a time limit of 2 hours 40 minutes, about 2 minutes per question. It is closed book. The passing score is 70%. Check the current board bulletin before you book.

How much practice does this prep include?

It includes 4 full-length practice exams and 400 practice questions in total. Every question has a written explanation naming the code section the answer comes from.

How long is the study guide?

The Massachusetts Master Plumber guide runs to roughly 20,857 words in 20 sections, starting with “About the Massachusetts Master Plumber license” and ending with “Exam-day strategy”.

How long do I get access?

Choose 30, 60 or 90 days at checkout. Your days do not start at checkout: they begin the first time you open the course (or 14 days after purchase, whichever comes first). Access works on any device, and you can retake every practice exam as often as you like. Days remaining are shown in your dashboard and you can extend at any time.

Is this an official Massachusetts Master Plumber exam?

No. This is independent preparation material. It is not affiliated with or endorsed by any state licensing board or exam vendor, and it does not contain real exam questions. Always confirm current requirements with your licensing board.

About this prep

This prep is built specifically for the Massachusetts Master Plumber examination and includes a 20,000+-word study guide written for this exam, 4 full-length practice exams and 400 practice questions, each with a written explanation.

How access works

You are paying for access length (30, 60, or 90 days). The study guide and four timed exams are the same on every term. Your days start the first time you open the course, not at checkout (or 14 days after purchase, whichever comes first), and access works on any device for that term.

Not affiliated with or endorsed by any state licensing board or exam vendor. For exam-preparation purposes only.