- What the MA-MP Exam Actually Tests
- Eligibility You Must Clear Before Registering
- Exam Format: Part I Written vs. Part II Practical
- Domain-by-Domain Breakdown
- Registration, Fees, and Scheduling Mechanics
- What You Can (and Cannot) Bring to PSI
- Passing Score and Retake Rules
- A Domain-Focused Study Timeline
- Where Candidates Lose Points
- After You Pass: Licensing and Renewal
- Frequently Asked Questions
- MA-MP has two separately timed parts: 80 written questions in 160 minutes, 40 practical questions in 160 minutes.
- You need 70% on each part independently - a strong written score cannot offset a weak practical score.
- Gas Piping, Equipment, and Appliances (21 items) and Isometric Analysis (20 items) are the two heaviest domains overall.
- A passing part stays valid for one year, so you only retest the part you failed.
What the MA-MP Exam Actually Tests
The Massachusetts Master Plumber License Exam (MA-MP) is administered through PSI Services LLC on behalf of the Massachusetts Board of State Examiners of Plumbers and Gas Fitters, Division of Occupational Licensure. It is not a single test - it is two independently scored examinations that together confirm you can practice at the master-plumber level of responsibility: designing and overseeing installations, interpreting gas code, and sizing systems rather than only performing journeyman-level tasks under supervision.
If you're still mapping out what this credential involves before committing time and money, start with our broader overview at What Is MA-MP? and the plain-language breakdown in MA-MP Meaning. This guide assumes you already know the basics and want the specific mechanics of passing on your first attempt.
Eligibility You Must Clear Before Registering
Before you can even sit for MA-MP, the Board requires you to hold an active Massachusetts journeyman plumber license, document at least one year and 1,700 hours of qualifying work performed as a licensed journeyman, and complete the Board-approved 110-hour Tier Five education. If you already completed Tier Five as an apprentice, you do not need to repeat it - a detail that trips up candidates who assume every license tier demands fresh coursework.
The online application also requires verification of your experience and education, a notarized CORI acknowledgement, and a passport-style photo, all reviewed before the Board grants approval to schedule with PSI. For a full walkthrough of every prerequisite, document, and timing consideration, see MA-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Key Takeaway
Gather your 1,700-hour work verification and Tier Five completion records early - Board approval has to happen before PSI will let you schedule either part of the exam.
Exam Format: Part I Written vs. Part II Practical
Candidates frequently underestimate how differently the two parts behave. Part I is a broad regulatory and technical knowledge test; Part II is a narrower, calculation-heavy practical exam built around isometric drawings and gas math. Both are closed-book and computer-generated, and both require a 70% minimum score - independently. A high Part I score does not carry over to help you pass Part II, and vice versa.
| Feature | Part I - Written | Part II - Practical |
|---|---|---|
| Question count | 80 questions | 40 questions |
| Time allowed | 160 minutes | 160 minutes |
| Passing threshold | 70% | 70% |
| Core focus | Regulations, gas systems, fixtures, venting, DWV | Isometric analysis, trade calculations, gas piping/venting |
| Format | Closed-book, computer-generated | Closed-book, computer-generated |
Note that the two 160-minute blocks are not interchangeable - the exam totals 120 questions and 320 minutes across both parts, but you cannot borrow time from one part to finish the other. Treat them as two separate exam-day events even if you schedule them back to back.
Domain-by-Domain Breakdown
MA-MP is built from sixteen domains split across the two parts. Domains 1 through 12 belong to Part I; domains 13 through 16 belong to Part II. Knowing the exact item counts lets you allocate study hours proportionally instead of spreading yourself evenly across topics that carry very different weight.
Part I Domains (80 items total)
- Domain 1 - General Regulations, Inspections, and Permits: 9 items
- Domain 2 - Gas Piping, Equipment, and Appliances: 21 items (largest 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 Domains (40 items total)
- Domain 13 - Isometric Analysis: 20 items (largest single domain on the entire exam)
- Domain 14 - General Trade Calculations: 5 items
- Domain 15 - Gas Piping: 7 items
- Domain 16 - Gas Venting: 8 items
Two domains dominate the entire exam: Gas Piping, Equipment, and Appliances at 21 of 80 Part I items, and Isometric Analysis at 20 of 40 Part II items. Together they represent a disproportionate share of your total score, so weak preparation in either one is the single fastest way to fail a part. For a deeper walkthrough of each domain's specific content and reference sections, read MA-MP Exam Domains 2026: Complete Guide to All 16 Content Areas.
Registration, Fees, and Scheduling Mechanics
Understanding the fee structure prevents surprises during registration. Expect a $31 application fee submitted through the Board's process, an $80 examination administration fee for each initial attempt or retake, and - once you pass - a $78 initial license fee. These are separate line items, not one bundled charge, and the $80 exam fee applies every time you sit for a part, whether it's your first try or a retake of a single failed section.
Applications and license management run through the eLIPSE system, and the current PSI candidate bulletin is dated October 3, 2025 - always confirm you're studying from the active bulletin version rather than an older cached copy. For the complete cost picture including license renewal, see MA-MP Certification Cost 2026: Complete Pricing Breakdown, and check current testing windows in MA-MP Exam Dates 2026: Testing Windows, Deadlines & Scheduling before you lock in a date.
Key Takeaway
Eligible veterans should submit DD214 documentation as part of the bulletin process to claim the five-percent examination credit - it's easy to miss if you rush the application.
What You Can (and Cannot) Bring to PSI
Both parts are closed-book. Reference books, including your own annotated copies of 248 CMR or NFPA codes, are not permitted inside the examination center. You're allowed a silent, non-printing, non-programmable battery calculator without alphabet keys - standard basic or scientific calculators work, but anything with text-entry or programmable functions will be rejected at check-in. PSI supplies scratch paper on-site, so you don't need to bring your own.
This matters most for Part II, where trade calculations and isometric analysis require working through numbers under time pressure. Practice with the exact calculator model you plan to bring so the button layout is second nature before exam day.
Passing Score and Retake Rules
You need a minimum of 70% on Part I and a separate minimum of 70% on Part II. There is no combined or averaged score - each part stands alone. If you pass one part and fail the other, the passing part remains valid for one year, and you only need to retake the part you failed. This is a meaningful advantage: it means a candidate who narrowly misses Part II doesn't have to redo the 80-question written exam.
Master-level attempts are unlimited under the current bulletin, but remember that each retake still costs the $80 administration fee. For the exact scoring mechanics and how PSI reports results, see MA-MP Passing Score 2026: Exactly What You Need to Pass. If you're trying to gauge how tough this exam really is relative to your current experience level, How Hard Is the MA-MP Exam? Complete Difficulty Guide 2026 breaks down the difficulty by domain, and MA-MP Pass Rate 2026: What the Data Shows covers what's publicly known about outcomes.
A Domain-Focused Study Timeline
Generic study techniques only help if you point them at the right material. Because MA-MP's weight is so concentrated in a handful of domains, your schedule should mirror the item counts rather than treat all sixteen domains equally. Here's a six-week structure built around that weighting.
Gas Piping, Equipment, and Appliances (Domain 2)
- Work through NFPA 54 sizing tables and appliance clearance rules
- Drill the 248 CMR gas sections most likely to appear at this domain's 21-item weight
Venting and DWV (Domains 3 and 10)
- Practice vent sizing and DWV layout problems, since together these two domains hold 25 of Part I's 80 items
- Cross-reference 248 CMR 10.00-10.23 for venting requirements
Regulations, Water Supply, and remaining Part I domains
- Cover General Regulations, Inspections, and Permits alongside Water Supply, Separators/Interceptors, and the smaller two- and three-item domains
- Take a timed 80-question practice run under the 160-minute limit
Isometric Analysis (Domain 13)
- Focus almost entirely here - it's 20 of Part II's 40 items
- Practice reading and marking up isometric drawings until pipe runs and fittings are instantly recognizable
Gas Piping, Gas Venting, and Trade Calculations (Domains 14-16)
- Practice sizing calculations using only the calculator type allowed at PSI
- Work NFPA 58 LP-gas problems alongside NFPA 54 fuel gas venting questions
Full timed simulations and gap review
- Sit two full practice sessions matching the 160-minute-per-part structure
- Revisit whichever domain scored below 70% in simulation
Run practice questions modeled on the real format at our MA-MP practice test platform so you get used to the closed-book, computer-generated question style before test day. For the full syllabus reference alongside your study plan, keep MA-MP Cheat Sheet 2026: One-Page Review of Must-Know Facts nearby during weeks 3 through 6.
Where Candidates Lose Points
Three patterns show up repeatedly among candidates who need a retake:
- Treating the two parts as one exam. Studying only for the written portion and assuming practical familiarity will "come naturally" underestimates how calculation-heavy and isometric-specific Part II really is.
- Under-weighting the smaller domains until it's too late. Domains like Traps and Cleanouts, Hangers and Supports, and Joints and Connections carry only 2 items each, but skipping them entirely still costs points that add up when you're near the 70% line.
- Practicing without a compliant calculator. Discovering at check-in that your calculator has alphabet keys or programmable memory wastes a scheduled attempt and the associated $80 fee.
After You Pass: Licensing and Renewal
Once you clear both parts, licensing is managed through eLIPSE, and the master-plumber license renews biennially by May 1 of even-numbered years. Renewal requires the $78 master-plumber renewal fee and 12 hours of approved continuing education per two-year cycle. Building renewal and CE tracking into your calendar now avoids a lapse later.
If you're weighing whether pursuing the master license is worth the time and fees relative to staying at journeyman level, Is the MA-MP Certification Worth It? Complete ROI Analysis 2026 and MA-MP Salary Guide 2026: Complete Earnings Analysis lay out the career context, while MA-MP Jobs covers the kind of work - permitting, design oversight, running crews - that typically opens up once you hold the credential. You can also review the certification itself in more depth at MA-MP Certification or start from the basics again with What Is A MA-MP? and What Does MA-MP Stand For? if you're sharing this guide with someone newer to the process.
For hands-on skill-building leading up to your Tier Five hours or continuing education, MA-MP Training covers program options, and the main practice test hub is the fastest way to convert this study guide into actual timed reps before you walk into a PSI test center.
Frequently Asked Questions
The bulletin treats them as independently scored and timed exams, and since a passing part stays valid for one year, candidates commonly schedule them separately rather than back-to-back on the same day.
No. Only the failed part needs retaking, and it still costs the $80 administration fee. The part you already passed remains valid for one year from when you passed it.
Master-level attempts are unlimited under the current PSI bulletin, though each attempt - initial or retake - requires paying the $80 examination administration fee again.
Bring a silent, non-printing, non-programmable battery calculator that has no alphabet keys. PSI provides scratch paper, so you don't need to bring your own paper or reference sheets.
Not if you already completed the Board-approved 110-hour Tier Five education as an apprentice - it does not need to be repeated to qualify for the master exam application.