- What Is the WI-MP Certification?
- Who Issues It and Who Administers the Exam
- Eligibility: How Wisconsin Journeyman Plumbers Qualify
- Exam Structure: Part 1 and Part 2
- Domain Breakdown
- What You Can Bring: Open-Book Rules
- Fees, Scheduling, and Validity
- After You Pass: License Term and Renewal
- Building a WI-MP Study Timeline
- Who Hires WI-MP Master Plumbers
- Frequently Asked Questions
- The WI-MP exam is two Pearson VUE parts: Part 1 (110 questions, 4 hours) and Part 2 (132 questions, 4 hours).
- Each part costs $95, is open book, and requires a 70% passing score.
- Eligibility requires three years at 1,000+ hours annually as a licensed Wisconsin Journeyman Plumber, or an approved engineering degree.
- Only DSPS-approved bound references are allowed - no loose paper, tabs, or sticky notes.
What Is the WI-MP Certification?
The WI-MP - the Wisconsin Master Plumber License Examination - is the credentialing exam administered on behalf of the Wisconsin Department of Safety and Professional Services (DSPS) for plumbers seeking to move from Journeyman status into Master Plumber licensure. It is not a single test but a two-part computer-based examination delivered through Pearson VUE testing centers located throughout Wisconsin. Passing both parts is the gatekeeping step that allows a Wisconsin plumber to legally supervise plumbing work, pull permits as a Master, and operate at the top tier of the state's plumbing trade hierarchy.
If you're just getting oriented, our companion pieces on What Is WI-MP? and WI-MP Meaning cover the terminology in more depth, while What Does WI-MP Stand For? and What Does WI-MP Mean? address common naming confusion since other unrelated credentials share the same three letters.
Who Issues It and Who Administers the Exam
Licensing authority rests with the Wisconsin Department of Safety and Professional Services, which sets eligibility rules, approves continuing education, and issues the actual Master Plumber license. The testing itself, however, is delivered by Pearson VUE at six in-state testing centers. This split matters: DSPS handles your application, documentation, and renewal, while Pearson VUE handles scheduling, seat availability, and exam-day logistics. Candidates sometimes assume one entity manages both - understanding the division helps you know exactly where to direct scheduling questions versus licensing questions.
For a fuller walk-through of how these two roles interact across the qualification process, see What Is A WI-MP? and What Is WI-MP Certification?.
Eligibility: How Wisconsin Journeyman Plumbers Qualify
Most candidates reach the WI-MP exam through hands-on trade experience rather than a classroom path. The primary route requires at least 1,000 hours per year working as a licensed Wisconsin Journeyman Plumber, sustained across three years. An alternative pathway exists for candidates holding an approved plumbing-related engineering degree, which can substitute for some of the field-hour requirement.
Wisconsin also recognizes comity pathways for plumbers who trained or licensed out of state. These pathways evaluate qualifying out-of-state apprenticeships, existing licenses, and documented experience on a case-by-case basis, so the exact documentation you'll need can vary depending on where you trained.
Eligibility Snapshot
Before you register for either exam part, confirm your pathway matches one of these:
- Three years as a licensed Wisconsin Journeyman Plumber at 1,000+ hours/year
- An approved plumbing-related engineering degree
- A qualifying comity pathway from out-of-state licensure, apprenticeship, or experience
Because eligibility rules can change and documentation requirements are specific, review the detailed breakdown in WI-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify before submitting anything to DSPS.
Exam Structure: Part 1 and Part 2
The WI-MP exam is split into two distinct, separately scheduled parts, each administered as a computer-based test at Pearson VUE centers:
| Attribute | Part 1 | Part 2 |
|---|---|---|
| Question Count | 110 questions | 132 questions |
| Time Allowed | 4 hours | 4 hours |
| Fee | $95 | $95 |
| Format | Open book, computer-based | Open book, computer-based |
| Passing Score | 70% | 70% |
Notice that Part 2 carries more questions than Part 1 despite the identical four-hour window - meaning your pacing strategy needs to differ between the two sittings. Part 2 represents the larger share of the overall examination content, so many candidates dedicate proportionally more prep time to it. We break down exactly how to pace each part in How Hard Is the WI-MP Exam? Complete Difficulty Guide 2026.
Key Takeaway
Since Part 2 has 132 questions versus Part 1's 110 in the same four-hour window, you have less time per question on Part 2 - practice timed question sets specifically for that part.
Domain Breakdown
The WI-MP exam is organized around two formal content domains, each corresponding directly to the two exam parts:
Domain 1: Master Plumber - Part 1
This domain covers the foundational content assessed in the 110-question, four-hour first exam part. Candidates should expect questions drawn from core plumbing code application, system design fundamentals, and the technical judgment expected of someone stepping into a supervisory Master-level role.
- Code interpretation and application under open-book conditions
- Fundamental system design and sizing principles
- Material and installation standards relevant to Master-level oversight
Domain 2: Master Plumber - Part 2
This domain covers the larger, 132-question second part. Because it represents the bigger share of total exam content, it typically demands broader review across a wider range of applied scenarios and supervisory-level problem solving.
- Extended code application across more complex scenarios
- Advanced system design and troubleshooting judgment
- Supervisory-level decision-making reflected in scenario-based questions
For a full content-area breakdown with study emphasis for each domain, see WI-MP Exam Domains 2026: Complete Guide to All 2 Content Areas.
What You Can Bring: Open-Book Rules
Both exam parts are open book, but "open book" does not mean "bring whatever you want." DSPS restricts materials to approved, bound references and notes. Specifically prohibited items include loose paper, removable tabs, sticky notes, and paperclips - anything that could be added, removed, or rearranged during testing is disallowed. Practice exams themselves are also prohibited as reference material inside the testing room.
On the permitted side, architect and engineer scale rulers are allowed, which matters for questions involving drawings, layouts, or dimensional calculations.
Fees, Scheduling, and Validity
Each part of the WI-MP exam costs $95, meaning a candidate sitting for both parts pays $190 total in exam fees alone, separate from any licensing or application fees charged by DSPS. A full cost breakdown, including how these testing fees compare to renewal and application costs, is available in WI-MP Certification Cost 2026: Complete Pricing Breakdown.
Once you pass, your results remain valid for one year. This is an important detail for candidates who pass Part 1 but delay Part 2 - plan your scheduling so both parts are completed within that one-year validity window, or you risk having to retest. For details on scheduling both parts strategically, review WI-MP Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
The required passing threshold on each part is 70%. If you want a precise explanation of how that score is calculated and what it means for your margin of error on 110 or 132 questions, see WI-MP Passing Score 2026: Exactly What You Need to Pass.
After You Pass: License Term and Renewal
Passing both exam parts and completing the DSPS application process results in a Master Plumber license with a four-year term. The license expires March 31 at the end of that cycle, regardless of when during the term you were initially licensed - so mark your calendar accordingly rather than assuming a rolling four-year window from your issue date.
Renewal costs $500 and requires 24 hours of DSPS-approved continuing education completed within the license term. Because CE requirements and deadlines can be easy to underestimate, track your hours from day one rather than scrambling before the March 31 expiration.
Key Takeaway
Your Master Plumber license expires March 31 on a four-year cycle - track your 24 CE hours early so renewal at $500 isn't a last-minute scramble.
Building a WI-MP Study Timeline
Because the WI-MP exam is split into two separately weighted parts, your prep schedule should mirror that structure rather than treating the material as one undifferentiated pool. A reasonable approach dedicates early weeks to Domain 1 fundamentals, then shifts emphasis toward Domain 2's broader, larger-share content as your test date approaches - since Part 2's 132 questions carry more overall exam weight than Part 1's 110.
Domain 1 Foundations
- Review core code sections tied to Part 1 topics
- Practice navigating your bound reference material quickly
- Take timed 110-question practice sets
Domain 2 Depth
- Focus extra hours here since Part 2 is the larger content share
- Work through scenario-based and supervisory-judgment questions
- Time yourself against the 132-question, four-hour format
Full Simulation & Review
- Run full-length timed simulations for both parts
- Finalize and organize your bound reference materials
- Confirm Pearson VUE scheduling and identification requirements
For a more detailed week-by-week study plan built specifically around WI-MP's structure, see WI-MP Study Guide 2026: How to Pass on Your First Attempt. If you want a compact reference for last-minute review, our WI-MP Cheat Sheet 2026: One-Page Review of Must-Know Facts condenses the highest-value facts into one page. You can also sharpen timing and question familiarity using full-length simulations on our WI-MP practice test platform.
Who Hires WI-MP Master Plumbers
Master Plumber licensure in Wisconsin opens roles that Journeyman status alone cannot - permit-pulling authority, legal supervision of apprentices and journeymen, and business ownership or plumbing-contractor registration. Plumbing contracting firms, mechanical contractors, municipal utilities, and larger commercial construction firms across Wisconsin regularly seek Master-licensed plumbers to oversee crews and sign off on code-compliant installations.
If you're weighing whether pursuing the license is worth the time and fees involved, Is the WI-MP Certification Worth It? Complete ROI Analysis 2026 lays out the tradeoffs, and WI-MP Salary Guide 2026: Complete Earnings Analysis covers how compensation shifts at the Master level. For open roles and how licensure factors into hiring decisions, see WI-MP Jobs, and if you're still building toward eligibility, WI-MP Training outlines preparatory pathways.
You can also compare your current readiness against real exam pacing using timed practice on our practice exam platform, which mirrors the two-part, timed structure of the actual Pearson VUE test.
Frequently Asked Questions
No. Part 1 and Part 2 are separately scheduled exams, each with its own $95 fee and four-hour time block. Just keep in mind that once you pass a part, that result is valid for one year, so plan your second sitting within that window.
Only DSPS-approved bound references and notes are permitted. Loose paper, removable tabs, sticky notes, and paperclips are not allowed, so any personal notes need to be bound rather than loose-leaf.
Each part of the WI-MP exam requires a 70% passing score, calculated independently for Part 1's 110 questions and Part 2's 132 questions.
The license term is four years, expiring March 31, after which renewal costs $500 and requires 24 hours of DSPS-approved continuing education.
Yes. The main path is three years as a licensed Wisconsin Journeyman Plumber at 1,000+ hours per year, but an approved plumbing-related engineering degree can also qualify you, and separate comity pathways exist for out-of-state apprenticeships, licenses, and experience.