- What Is A MA-MP, Exactly?
- Who Issues the MA-MP and Who Administers It
- Exam Format: Two Parts, 120 Questions, 320 Minutes
- The 16 Domains Behind the MA-MP
- Who Can Sit for the MA-MP
- MA-MP Fees and Registration Mechanics
- Scoring, Retakes, and the One-Year Rule
- Who Actually Needs a MA-MP
- Preparing for the MA-MP Without Wasting Time
- After You Pass: Licensing and Renewal
- Frequently Asked Questions
- MA-MP is the Massachusetts Master Plumber License Exam, administered by PSI Services LLC for the Division of Occupational Licensure.
- The exam has two parts: 80-question Written (160 minutes) and 40-question Practical (160 minutes) - 120 questions, 320 minutes total.
- You need 70% on each part separately; a passing part stays valid for one year while you retake only the failed part.
- Candidates need a MA journeyman license, 1,700 hours as a journeyman, and 110 hours of Tier Five education.
What Is A MA-MP, Exactly?
MA-MP stands for the Massachusetts Master Plumber License Exam. It is the state-mandated examination that a licensed Massachusetts journeyman plumber must pass before applying for a Master Plumber license through the Division of Occupational Licensure. It is not a national certification, not a voluntary credential, and not affiliated with any other organization that happens to share the same three-letter shorthand. If you've searched for other definitions of "MA-MP" online, disregard them here - on this site, and in this article, MA-MP refers exclusively to the Massachusetts exam described in the PSI candidate bulletin dated October 3, 2025.
For a broader breakdown of terminology, see MA-MP Meaning and What Does MA-MP Stand For? This article focuses specifically on what the exam covers, how it's structured, and who needs to take it.
Who Issues the MA-MP and Who Administers It
The credential sits under the Massachusetts Board of State Examiners of Plumbers and Gas Fitters, part of the Division of Occupational Licensure. The Board sets eligibility rules, references, and passing standards, while PSI Services LLC builds and delivers the actual computer-based test at approved testing centers. When you register, apply, or check the current bulletin, you're dealing with PSI's system; when you apply for the underlying license or renew it, you're dealing with the Commonwealth's eLIPSE portal.
This two-agency structure trips up a lot of first-time applicants, because the online application (experience verification, notarized CORI acknowledgement, passport-style photo, Board approval) happens on the state side, while exam scheduling and the day-of testing experience happen through PSI. If you're unclear on any step, the MA-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify guide walks through the sequence in order.
Exam Format: Two Parts, 120 Questions, 320 Minutes
The MA-MP is not a single sitting with one flexible clock. It is built as two independently scored and timed parts:
- Part I - Written: 80 questions, 160 minutes
- Part II - Practical: 40 questions, 160 minutes
Add them together and you get 120 questions across 320 minutes total - but that combined figure is informational only. You cannot borrow time from Part I to finish Part II, and you cannot bank unused minutes. Each part runs on its own clock with its own 70% passing threshold, and each is closed-book and computer-generated.
Part II, the practical portion, is where isometric analysis and trade/gas calculations live. This is the section that separates candidates who memorized code sections from those who can actually read a system diagram and size pipe or calculate gas load under time pressure.
Key Takeaway
Treat Part I and Part II as two separate exams that happen to be scheduled together. Budget your study time - and your test-day mental energy - accordingly rather than assuming one is a warm-up for the other.
What's Allowed in the Testing Center
No reference books are permitted at the workstation. You may bring a silent, non-printing, non-programmable battery calculator without alphabet keys, and PSI supplies scratch paper on site. Everything else - the 248 CMR sections, NFPA 54, NFPA 58, MGL Chapter 142 - needs to already be in your head or accessible through the exam's own reference material, not a personal binder.
The 16 Domains Behind the MA-MP
The MA-MP content outline splits into 16 domains, with Domains 1-12 belonging to Part I (Written) and Domains 13-16 belonging to Part II (Practical). Item counts per domain are fixed in the bulletin, which means you can rank exactly where to spend your prep time instead of guessing.
Part I - Written (80 items)
- Domain 1: General Regulations, Inspections, and Permits - 9 items
- Domain 2: Gas Piping, Equipment, and Appliances - 21 items (largest domain in Part I)
- Domain 3: Venting - 12 items
- Domain 4: Traps and Cleanouts - 2 items
- Domain 5: Fixtures, Equipment, and Clearances - 2 items
- Domain 6: Water Heaters - 3 items
- Domain 7: Piping, Valves, and Controls - 3 items
- Domain 8: Water Supply - 6 items
- Domain 9: Hangers and Supports - 2 items
- Domain 10: Drain, Waste, and Vent - 13 items
- Domain 11: Separators, Interceptors, and Grease Traps - 5 items
- Domain 12: Joints and Connections - 2 items
Part II - Practical (40 items)
- Domain 13: Isometric Analysis - 20 items (largest domain in Part II, half the entire section)
- Domain 14: General Trade Calculations - 5 items
- Domain 15: Gas Piping - 7 items
- Domain 16: Gas Venting - 8 items
Two numbers matter more than any others on this list: 21 (Gas Piping, Equipment, and Appliances, the biggest slice of Part I) and 20 (Isometric Analysis, exactly half of Part II). Together these two domains account for a disproportionate share of your overall score. Drain, Waste, and Vent (13 items) and Venting (12 items) round out the next tier of priority in Part I.
For a domain-by-domain breakdown of subtopics, sample question angles, and code cross-references, see the MA-MP Exam Domains 2026: Complete Guide to All 16 Content Areas.
Who Can Sit for the MA-MP
You can't register for the MA-MP just because you want a master's credential on your resume. Eligibility is gated by prior licensure and hours:
- A current Massachusetts journeyman plumber license
- At least one year and 1,700 hours of qualifying work as a licensed journeyman
- Completion of the Board-approved 110-hour Tier Five education requirement
If you already completed Tier Five education as an apprentice, you don't have to repeat it - the Board recognizes prior completion. The application itself is submitted online and requires experience and education verification, a notarized CORI acknowledgement, and a passport-style photo before the Board grants approval to schedule the exam.
Full detail on documentation, timelines, and common eligibility mistakes is covered in MA-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify.
MA-MP Fees and Registration Mechanics
Budgeting for the MA-MP means accounting for three separate charges, not one flat exam fee:
| Fee | Amount | Purpose |
|---|---|---|
| Examination administration fee | $80 | Charged for an initial attempt or any retake |
| Application fee | $31 | Processing of the online licensure application |
| Initial license fee | $78 | Issued upon passing and licensure |
Note that the $80 exam fee applies per attempt - if you fail one part and only need to retake it, you're still paying to sit for that retake. A full cost breakdown, including renewal fees down the line, is available in MA-MP Certification Cost 2026: Complete Pricing Breakdown.
Scoring, Retakes, and the One-Year Rule
Each part of the MA-MP requires a minimum score of 70%, scored independently. Pass Part I but fail Part II, and you only need to retake Part II - your passing Part I score remains valid for one year from the date you passed it. This matters for scheduling: if you're confident about the written material but shaky on isometric analysis, you can attempt Part I, lock it in, and dedicate a focused second block of study time to the practical before your window closes.
There's no cap on master-level attempts under the current bulletin, but every attempt (initial or retake) carries the $80 administration fee, so repeated attempts add up financially even without a hard limit. For the exact numeric thresholds and how they interact across both parts, see MA-MP Passing Score 2026: Exactly What You Need to Pass. If you want a realistic sense of how demanding the exam is in practice, How Hard Is the MA-MP Exam? Complete Difficulty Guide 2026 and MA-MP Pass Rate 2026: What the Data Shows go deeper into that question.
Who Actually Needs a MA-MP
The MA-MP is a checkpoint, not an optional add-on. Anyone who wants to operate as a licensed Master Plumber in Massachusetts - running their own plumbing business, pulling permits as the licensed professional of record, supervising journeymen and apprentices on gas and plumbing work, or bidding jobs that require a master-level signature - has to clear both parts of this exam first. Contractors, business owners transitioning from journeyman work, and tradespeople aiming for supervisory roles on commercial or residential crews are the typical candidates.
Because the credential is tied directly to what you're legally allowed to do on a jobsite, employers and clients treat it as a hard line rather than a nice-to-have. If you're weighing whether pursuing the license is worth the time and fees involved, Is the MA-MP Certification Worth It? Complete ROI Analysis 2026 and MA-MP Salary Guide 2026: Complete Earnings Analysis lay out the practical tradeoffs. For where the credential actually opens doors, see MA-MP Jobs.
Preparing for the MA-MP Without Wasting Time
Because item counts per domain are fixed and published, MA-MP prep is one of the few licensing exams where you can build a study plan around exact weighting rather than guesswork. Gas Piping, Equipment, and Appliances (21 items) and Isometric Analysis (20 items) alone make up more than a third of the entire 120-question exam, so a generic "study everything equally" approach wastes time you don't have.
Gas Piping, Equipment, and Appliances + General Regulations
- Work through NFPA 54 and NFPA 58 sections relevant to sizing, venting, and appliance connections
- Cross-reference 248 CMR 10.00-10.23 for permit and inspection rules tested in Domain 1
Venting, DWV, and Water Supply
- Drill vent sizing scenarios and drain/waste/vent layout logic (Domains 3 and 10)
- Review MGL Chapter 142 provisions tied to water supply and cross-connection topics
Isometric Analysis and Trade Calculations
- Practice reading isometric drawings and identifying code violations or pipe sizing errors
- Time yourself on gas load and pipe sizing calculations using only an approved calculator
Full-Length Timed Runs
- Simulate the 160-minute Part I and 160-minute Part II blocks separately, not back-to-back as one long test
- Review any domain still under 70% before scheduling
A weekly cadence like this only works if it's anchored to the actual domain weights above - generic flashcard rotation without that anchor tends to over-study low-weight domains like Traps and Cleanouts (2 items) at the expense of high-weight ones. For a more detailed week-by-week strategy and practice-question approach, see the MA-MP Study Guide 2026: How to Pass on Your First Attempt. You can also run full domain-weighted practice sessions on the main practice test platform to see where your real score gaps are before test day.
Key Takeaway
Spend roughly a third of your study time on Gas Piping/Equipment/Appliances and Isometric Analysis combined - they carry that same rough share of the total 120 questions.
After You Pass: Licensing and Renewal
Passing both parts doesn't automatically hand you a license - it clears you to complete licensure through eLIPSE, the Commonwealth's licensing system. Once issued, 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 cycle. Mark that renewal date now if you're planning your exam timeline - passing the exam close to a renewal deadline can compress your first cycle.
Official references worth bookmarking include the PSI candidate bulletin, the Mass.gov master plumber application page, 248 CMR 11 on education and experience standards, the plumber/gas fitter renewal page, and the DPL license fee lookup tool. Keep these on hand rather than relying on secondhand summaries, since bulletins and fee schedules do get updated.
Frequently Asked Questions
Functionally two. Part I (Written, 80 questions, 160 minutes) and Part II (Practical, 40 questions, 160 minutes) are independently timed and independently scored, even though they're scheduled under the same registration.
No. A passing part stays valid for one year, so you only need to retake the part you failed within that window, paying the $80 administration fee for that retake.
A minimum of 70% on each part separately - scoring above 70% on one part does not offset a lower 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 workstation.
Gas Piping, Equipment, and Appliances is the largest domain in Part I at 21 of 80 questions, and Isometric Analysis is the largest in Part II at 20 of 40 questions.