- What MA-MP Actually Refers To
- Who Administers the Exam
- Exam Structure: Two Parts, Two Clocks
- The 16 Domains Behind the Two Parts
- Eligibility Before You Can Sit
- Fees and the Application Path
- What the Testing Center Looks Like
- Passing Scores, Retakes, and Validity
- After Passing: Licensing and Renewal
- How to Approach Preparation
- Frequently Asked Questions
- MA-MP is the Massachusetts Master Plumber License Exam, delivered by PSI Services for the Board of State Examiners of Plumbers and Gas Fitters.
- The exam has two parts: an 80-question written Part I (160 minutes) and a 40-question practical Part II (160 minutes).
- You need 70% on each part separately - a strong Part I score cannot offset a weak Part II score.
- Applicants need a Massachusetts journeyman license, one year/1,700 hours of qualifying journeyman work, and 110-hour Tier Five education.
What MA-MP Actually Refers To
On this site, MA-MP stands for the Massachusetts Master Plumber License Exam - the state licensing test that a Massachusetts journeyman plumber must pass to become a licensed master plumber. It is not a national voluntary certification and it is not affiliated with any other credential that happens to share the same three-letter shorthand. If you searched "what is MA-MP" expecting a generic professional certification, this is instead a state-regulated occupational license tied directly to Massachusetts plumbing law.
Because the name is so easy to confuse with other acronyms, it's worth being precise from the start: this exam is administered under the authority of the Massachusetts Division of Occupational Licensure, and every fact discussed in this article - fees, question counts, timing, domains - comes from the official PSI candidate bulletin and Mass.gov licensing pages, not from any other industry's exam.
Who Administers the Exam
The exam is overseen by the Massachusetts Board of State Examiners of Plumbers and Gas Fitters, part of the state's Division of Occupational Licensure. Actual test delivery - scheduling, score reporting, and the candidate bulletin - is handled by PSI Services LLC, a third-party testing vendor used by many state licensing boards. The current PSI bulletin referenced for this exam is dated October 3, 2025, and it is the authoritative source for content outlines, fees, and testing rules.
Licenses themselves, once earned, live in the state's eLIPSE system, which is also where renewals and continuing education records are tracked. If you want the full breakdown of who qualifies and what documentation is required before you can even schedule the exam, see MA-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Exam Structure: Two Parts, Two Clocks
The MA-MP exam is split into two independently scored and independently timed sections. This distinction matters more than most candidates realize:
- Part I - Written: 80 questions, 160 minutes.
- Part II - Practical: 40 questions, 160 minutes.
Combined, that's 120 questions across 320 minutes - but those numbers are for reference only. You cannot borrow extra time from Part I to finish Part II, or vice versa. Each part runs on its own clock and is scored on its own merits. Pacing yourself around roughly two minutes per written question and four minutes per practical question is a more realistic mental model than treating the exam as one long 320-minute sitting.
Key Takeaway
Treat Part I and Part II as two separate exams taken back-to-back, not one combined test - your time budget and study plan should reflect that split.
Part II, the practical portion, is where isometric analysis and trade/gas calculations live. This is often the section candidates underestimate, since it demands spatial reasoning and math fluency rather than code memorization. For a deeper dive into why this section trips up experienced journeymen, read How Hard Is the MA-MP Exam? Complete Difficulty Guide 2026.
The 16 Domains Behind the Two Parts
The content outline breaks into 16 domains, 12 belonging to Part I and 4 belonging to Part II. Knowing the item counts per domain tells you exactly where your study hours should go.
| Domain | Part | Items |
|---|---|---|
| 1. General Regulations, Inspections, and Permits | I | 9 |
| 2. Gas Piping, Equipment, and Appliances | I | 21 |
| 3. Venting | I | 12 |
| 4. Traps and Cleanouts | I | 2 |
| 5. Fixtures, Equipment, and Clearances | I | 2 |
| 6. Water Heaters | I | 3 |
| 7. Piping, Valves, and Controls | I | 3 |
| 8. Water Supply | I | 6 |
| 9. Hangers and Supports | I | 2 |
| 10. Drain, Waste, and Vent | I | 13 |
| 11. Separators, Interceptors, and Grease Traps | I | 5 |
| 12. Joints and Connections | I | 2 |
| 13. Isometric Analysis | II | 20 |
| 14. General Trade Calculations | II | 5 |
| 15. Gas Piping | II | 7 |
| 16. Gas Venting | II | 8 |
Domain 2: Gas Piping, Equipment, and Appliances
This is the single largest domain in Part I at 21 of 80 questions - over a quarter of the written exam. Candidates must know appliance venting requirements, sizing methods, and code references pulled from NFPA 54 and relevant sections of 248 CMR.
- Gas appliance clearance and venting rules
- Pipe sizing methodology under the applicable fuel gas code
- Cross-references between MGL Chapter 142 and 248 CMR provisions
Domain 13: Isometric Analysis
The largest domain in Part II at 20 of 40 questions. This tests your ability to read isometric drawings and apply drain-waste-vent and gas piping logic spatially rather than from memory alone.
- Interpreting pipe runs, fittings, and slope from isometric sketches
- Identifying code violations embedded in a drawing
- Translating a drawing into calculated pipe lengths or sizes
Because Gas Piping, Equipment, and Appliances and Isometric Analysis together account for a disproportionate share of total questions, they deserve outsized attention in any study plan. For the full domain-by-domain content outline with study guidance for all 16 areas, see MA-MP Exam Domains 2026: Complete Guide to All 16 Content Areas.
Eligibility Before You Can Sit
You cannot register for MA-MP simply by paying a fee. The Board requires:
- An active Massachusetts journeyman plumber license.
- At least one year and 1,700 hours of qualifying work performed as a licensed journeyman.
- Completion of the Board-approved 110-hour Tier Five education requirement - though this does not need to be repeated if you already completed it during your apprenticeship.
The online application also requires verification of your experience and education, a notarized CORI acknowledgement, and a passport-style photo, all subject to Board approval before you're cleared to schedule a testing appointment. This is a multi-step administrative process, not a same-day signup, so plan the paperwork timeline separately from your study timeline. A full walkthrough of these prerequisites is available at MA-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Fees and the Application Path
MA-MP involves several distinct charges, and it helps to separate them clearly rather than treating "the exam fee" as one lump sum:
- Application fee: $31
- Examination administration fee: $80 per attempt (applies to both an initial sitting and any retake)
- Initial license fee: $78 (paid once you pass and are ready to be licensed)
Eligible veterans can receive a five-percent examination credit under the current bulletin upon submitting DD214 documentation - a detail worth confirming with the Board directly if it applies to you. For a complete cost breakdown including renewal fees down the road, see MA-MP Certification Cost 2026: Complete Pricing Breakdown.
What the Testing Center Looks Like
Both parts of MA-MP are closed-book, computer-generated exams. You will not have access to your code books, notes, or reference materials inside the testing center. What you can bring:
- A silent, non-printing, non-programmable battery calculator without alphabet keys.
- Nothing else for reference - PSI supplies scratch paper on-site for your calculations.
The referenced code materials behind the exam questions include 248 CMR 10.00-10.23 (Massachusetts Uniform State Plumbing Code 2023), specified 2021 and 2014 sections of 248 CMR, NFPA 54 (National Fuel Gas Code 2012), NFPA 58 (Liquefied Petroleum Gas Code 2011), and MGL Chapter 142. You won't have these open during the test, so internalizing the relevant provisions ahead of time - not just skimming them the night before - is essential.
Passing Scores, Retakes, and Validity
MA-MP requires a minimum of 70% on each part independently. Scoring 90% on the written portion does not compensate for a 60% on the practical portion - both must clear the 70% bar on their own.
If you fail one part but pass the other, you don't have to retake the part you passed. Under the current bulletin, a passing part remains valid for one year, so you only need to schedule and retake the failed part within that window. Master-level attempts are otherwise unlimited. For the exact scoring mechanics and what "passing" really means numerically, see MA-MP Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
If you fail Part II but pass Part I, you have a one-year window to retake only Part II - don't let that clock lapse or you'll need to pass both parts again.
After Passing: Licensing and Renewal
Once you pass both parts and pay the $78 initial license fee, your credential is managed through the state's eLIPSE system. Master plumber licenses renew biennially by May 1 of even-numbered years, with a $78 renewal fee and a requirement of 12 hours of approved continuing education per renewal cycle. This is an ongoing professional obligation, not a one-time exam event - something worth factoring into your long-term career planning alongside the exam itself. If you're evaluating whether the entire process is worth the time and cost, Is the MA-MP Certification Worth It? Complete ROI Analysis 2026 weighs that question directly, and MA-MP Salary Guide 2026: Complete Earnings Analysis looks at how master status affects earning potential in the trade.
How to Approach Preparation
Given the domain weighting, an efficient study sequence front-loads the heaviest-tested material first rather than moving domain-by-domain in numerical order. Since Gas Piping, Equipment, and Appliances (21 items) and Drain, Waste, and Vent (13 items) dominate Part I, and Isometric Analysis (20 items) dominates Part II, those three areas alone account for a large share of your total score.
Heaviest Part I domains
- Gas Piping, Equipment, and Appliances (21 items)
- Drain, Waste, and Vent (13 items)
- Venting (12 items)
Remaining Part I domains
- General Regulations, Inspections, and Permits
- Water Supply, Separators/Interceptors, and the smaller-weight domains
Part II focus
- Isometric Analysis practice drawings (20 items)
- Gas Piping and Gas Venting calculations
- General Trade Calculations drills
Timed simulation
- Full-length Part I run under a 160-minute clock
- Full-length Part II run under a separate 160-minute clock
- Review calculator workflow and scratch-paper technique
This kind of structured sequencing, paired with timed practice under realistic conditions, is covered in more depth in MA-MP Study Guide 2026: How to Pass on Your First Attempt. If you want a compact reference of the must-know facts - fees, timing, domain weights - to review in the final days before your appointment, bookmark MA-MP Cheat Sheet 2026: One-Page Review of Must-Know Facts.
Practicing with realistic, timed questions on our MA-MP practice test platform is one of the most direct ways to get comfortable with the pacing of both parts before exam day, since the split-timer format is unusual compared to many other licensing exams.
Frequently Asked Questions
No. MA-MP is a Massachusetts state license exam administered by the Board of State Examiners of Plumbers and Gas Fitters through PSI Services. It applies specifically to plumbers seeking master status in Massachusetts.
120 total across two parts: 80 questions on the written Part I and 40 questions on the practical Part II, each with its own 160-minute time limit.
You need at least 70% on Part I and 70% on Part II separately. A high score on one part does not offset a low score on the other.
No. Both parts are closed-book. You may bring a silent, non-printing, non-programmable calculator without alphabet keys, and PSI provides scratch paper at the testing center.
Your passing part stays valid for one year, so you only need to schedule and retake the part you failed within that window rather than sitting for the entire exam again.