MA-MP Passing Score 2026: Exactly What You Need to Pass

What "Passing" Actually Means on the MA-MP

The Massachusetts Master Plumber License Exam (MA-MP), administered through PSI Services LLC on behalf of the Massachusetts Board of State Examiners of Plumbers and Gas Fitters, is not scored as a single combined percentage. It is two independently scored and timed examinations that happen to be delivered in the same testing appointment. According to the PSI candidate bulletin dated October 3, 2025, a candidate must earn a minimum of 70% on Part I - Written and a minimum of 70% on Part II - Practical. There is no averaging between the two. Scoring 90% on the written portion does not offset a 60% on the practical, and vice versa.

This structure matters enormously for how you prepare. If you're building a study plan, treat this as two separate passing thresholds tied to two separate skill sets - one built on code knowledge and regulatory recall, the other on isometric analysis and trade/gas calculations. For a full walkthrough of how these skills map to license eligibility and the application process itself, see MA-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Part I vs. Part II: Two Separate Hurdles

Because each part is closed-book and computer-generated, and each has its own clock, pacing strategy differs by part. Part I gives you 160 minutes for 80 questions - an average of two minutes per question, though regulatory and code-recall items typically move faster than that, leaving more time for the calculation-heavy items scattered throughout. Part II gives you the same 160 minutes for only 40 questions, reflecting the extra time isometric analysis and trade/gas math problems typically require.

Both parts draw from the same reference set - 248 CMR 10.00-10.23 (Massachusetts Uniform State Plumbing Code, 2023 edition), specified 2021 and 2014 sections of 248 CMR, NFPA 54 (2012), NFPA 58 (2011), and MGL Chapter 142 - but Part II applies that knowledge through isometric drawings and calculation scenarios rather than direct recall. If you want a full breakdown of how content is distributed across all 16 domains, review MA-MP Exam Domains 2026: Complete Guide to All 16 Content Areas.

The Real Question Math Behind 70%

Percentages are abstract until you convert them into raw numbers you can track during practice sessions. On the MA-MP:

• Part I - Written: 70% of 80 questions = 56 questions correct. You can miss up to 24 questions and still pass.
• Part II - Practical: 70% of 40 questions = 28 questions correct. You can miss up to 12 questions and still pass.

Notice how much thinner the margin is on Part II - 12 missed questions out of 40 feels tighter than 24 missed out of 80, even though both represent the same 70% line. That's one reason candidates who describe the exam as harder than expected often point to the practical portion specifically. If you're weighing how demanding this credential really is compared to what you've heard, How Hard Is the MA-MP Exam? Complete Difficulty Guide 2026 digs into that in more depth.

How Domain Weighting Affects Your Score

Not every domain contributes equally to your score, and understanding weight distribution is one of the most concrete ways to prioritize study hours. Part I (Domains 1-12) is built from 80 items distributed as follows:

Gas Piping, Equipment, and Appliances alone accounts for roughly a quarter of Part I's 80 questions - more than Domains 4, 5, 6, 7, 9, and 12 combined. Drain, Waste, and Vent and Venting are the next-heaviest domains, together representing another 25 items. A study plan that spends equal time on all 12 Part I domains is mathematically inefficient; the weighting tells you exactly where the points are concentrated.

Isometric Analysis alone represents half of the entire Practical exam. Combined with the practical portion's tighter 12-question miss margin, this domain deserves disproportionate attention relative to its single-domain label. For item-by-item strategy on isometric drawings and calculation types, the domain guide linked above breaks each of the 16 areas down individually.

Retakes, Validity Windows, and Unlimited Attempts

The bulletin structure is genuinely candidate-friendly compared to many licensing exams: master-level attempts are unlimited, and a passing part remains valid for one year. That means if you clear Part I but fall short on Part II, you only need to retake Part II within that one-year window - you don't have to sit through the written portion again. This "only retake what you failed" model changes how you should approach exam-day risk. It rewards banking a Part I pass early rather than waiting to attempt both parts perfectly on the same day.

Each attempt, whether an initial sitting or a retake, carries an $80 examination administration fee, separate from the $31 application fee and $78 initial license fee paid earlier in the process. If a retake is on the table, budget for it explicitly rather than assuming your original fee covers a second attempt. A full fee breakdown, including renewal costs through eLIPSE, is available in MA-MP Certification Cost 2026: Complete Pricing Breakdown.

The Veteran Examination Credit

Eligible veterans receive a five-percent examination credit under the current bulletin, applied upon submission of DD214 documentation. This credit can meaningfully change the practical math above - shifting the effective bar on a 40-question Part II or an 80-question Part I slightly in the candidate's favor. Veterans should confirm documentation requirements directly with PSI or the Board before their scheduled date, since credit application is processed as part of eligibility verification rather than automatically calculated at the testing center.

Scheduling Study Time Around the Two-Part Format

Because Part I and Part II test fundamentally different skills - regulatory recall versus applied calculation and isometric reading - it makes sense to structure study weeks around that split rather than treating the whole exam as one undifferentiated body of material. Rotating short, focused review blocks and returning to weak domains a few days later (a spaced-repetition approach) works especially well given how unevenly weighted these domains are.

For a more detailed week-by-week framework and first-attempt strategy, see MA-MP Study Guide 2026: How to Pass on Your First Attempt. Running timed practice questions on our practice test platform throughout each week helps translate this schedule into the exact question-count targets - 56 of 80 and 28 of 40 - discussed earlier.

What You Can (and Can't) Bring to the Test Center

Both parts are closed-book, so reference books - including the 248 CMR sections, NFPA 54, NFPA 58, and MGL Chapter 142 - are not permitted in the examination center, even though they define the exam's content. You're expected to have internalized the material rather than look it up during the test. PSI does supply scratch paper, and candidates may bring a silent, non-printing, non-programmable battery calculator without alphabet keys - useful for the trade and gas calculations concentrated in Domains 14 and 15, and for the load and pipe-sizing math embedded throughout Part II.

Because reference materials aren't available during testing, memorization of key code thresholds, clearance distances, and gas piping sizing tables in advance is non-negotiable - not just for Domain 2, but for how it interacts with Gas Piping (Domain 15) and Gas Venting (Domain 16) on the practical side.

If you're still confirming whether you meet the underlying licensure prerequisites - a Massachusetts journeyman plumber license, at least one year and 1,700 hours of qualifying journeyman work, and the Board-approved 110-hour Tier Five education - that eligibility groundwork is covered separately in MA-MP Requirements 2026. Passing score mechanics only matter once you've cleared that eligibility bar and been approved to schedule through PSI.

Frequently Asked Questions