- The MN-JP written exam is scored out of 240 points; you need 70% to pass.
- Points are not tied one-to-one to question counts, so partial mastery of a task doesn't guarantee partial credit.
- You get 5 hours 30 minutes, an untabbed 2020 Minnesota Plumbing Code, a laws/rules booklet, and a basic calculator - nothing else.
- After a failed attempt, DLI requires at least a 30-day wait before you can reapply and pay the $50 fee again.
The Passing Score, Exactly
If you're searching for one number, here it is: the Minnesota Journeyworker Plumber License Exam is scored out of 240 points, and you need 70% of those points to earn your JP license. That's the entire benchmark. There's no separate cut score for calculations versus code lookup, no minimum-per-domain requirement published by the Minnesota Department of Labor and Industry (DLI), and no curve. You either accumulate enough points across the full 5-hour-30-minute exam or you don't.
What trips people up is assuming "240 points" means "240 questions." It doesn't. DLI structures the exam around point values, and some tasks - particularly diagram-based sizing problems and multi-part calculations - are worth more than a single multiple-choice item. That means a handful of miscalculated pipe-sizing problems can cost you more ground than missing several definition-based questions. For a full breakdown of what's actually being tested, see the MN-JP Exam Domains 2026: Complete Guide to All 16 Content Areas.
How the 240 Points Are Structured
DLI doesn't publish a public point-by-point rubric showing exactly how many points each task type carries, and this article won't invent numbers that aren't in the official materials. What is documented is the task format itself:
- Multiple-choice - single correct answer, typically the fastest points to secure if your code knowledge is solid.
- Multiple-response - select all that apply; partial selections generally don't earn partial credit, so these demand precision.
- Calculations - fixture unit totals, water supply sizing, drainage sizing, and similar numeric work.
- Diagram-based sizing - reading a system layout and applying code tables to size vents, drains, or water lines correctly.
Because the exam mixes these formats, your point total is really a sum of many small decisions made under time pressure. A candidate who is fast but sloppy on multiple-response items can lose as much ground as one who is careful but too slow to finish the diagram-sizing sections. Time management across 5 hours 30 minutes is as much a scoring factor as raw knowledge.
Key Takeaway
Treat calculation and diagram-sizing tasks as your highest-leverage point sources. Practice them until they're fast and automatic, since a slow, correct answer late in the exam is worth the same as a slow, correct answer at the start - but only if you actually get to it.
What DLI Puts On Your Desk
Unlike some certification exams where you bring your own annotated references, the MN-JP exam is deliberately closed-book in the way that matters most: DLI supplies an untabbed 2020 Minnesota Plumbing Code, a current laws/rules booklet, and a basic calculator. Personal reference books, tabbed or highlighted codes, and any electronic devices are prohibited.
This single detail changes how you should prepare more than almost anything else. If your only study method has been reading a tabbed code book at home, you'll walk into the exam and lose your tabs - literally. You need to be fast at navigating the 2020 Minnesota Plumbing Code (built on the 2018 Uniform Plumbing Code with Minnesota amendments, effective December 17, 2021) using only its table of contents and index, cold, under time pressure.
The application itself carries a $50 fee, separate from any prep materials or continuing education you'll need later. For the full financial picture - application fee, renewal costs, and what you might spend on study resources - see MN-JP Certification Cost 2026: Complete Pricing Breakdown.
How the 16 Domains Relate to Your Score
The current DLI-linked study guide (dated April 2022) organizes exam content into 16 knowledge areas. These are useful for structuring your review, but they are not a published, weighted blueprint - DLI doesn't state that Domain 7 is worth more points than Domain 12, for example. Treat the domain list as a map of what to know, not a scoring formula.
Domain 7: Chapter 6, Water Supply and Distribution
Sizing water distribution piping, understanding fixture supply demand, and applying code tables correctly are common sources of calculation-based points.
- Water supply fixture unit tables
- Pipe sizing methodology
- Backflow and cross-connection basics
Domain 8: Chapter 7, Sanitary Drainage
Drainage fixture units, pipe slope, and sizing drainage systems show up frequently in diagram-based problems.
- Drainage fixture unit calculations
- Horizontal and vertical pipe sizing
- Building drain and building sewer requirements
Domain 10: Chapter 9, Vents
Venting logic pairs directly with drainage sizing questions, so weak vent knowledge compounds errors on drainage problems too.
- Vent sizing and distance-to-trap rules
- Common venting configurations
- Island and wet venting scenarios
The remaining domains - including Chapter 2 Definitions, Chapter 3 General Regulations, Chapter 4 Fixtures, Chapter 5 Water Heaters, Chapter 8 Indirect Wastes, Chapter 10 Traps and Interceptors, Chapter 11 Storm Drainage, Chapter 16 Nonpotable Rainwater Catchment Systems, Chapter 4716 Licensing and Apprentice Registration, Minnesota Rules Chapter 1300, and miscellaneous related statutes - round out the knowledge base. A full walkthrough of all 16 areas, including the practical study angle for each, is in MN-JP Exam Domains 2026: Complete Guide to All 16 Content Areas.
Key Takeaway
Because there's no public weighting, don't gamble by skipping "smaller" chapters like Traps and Interceptors or Indirect Wastes. A 70% threshold across 240 points means broad coverage matters more than betting on a few high-traffic chapters.
If You Fall Short of 70%
DLI requires a minimum 30-day wait before you can reapply after a failed attempt. That's a real cost - not just the $50 reapplication fee, but a month of delayed licensure, delayed pay bumps, and delayed ability to work unsupervised. It's worth treating the exam as a one-shot event rather than a "see how it goes" trial run.
If you're still building toward eligibility rather than worrying about a retake, confirm your path first. The standard route requires four years and 7,000 qualifying hours - at least 2,000 in water distribution, 2,000 in drain/waste/vent, and 1,000 in fixture installation - certified by a responsible licensed master plumber. Registered apprenticeships and certain restricted or out-of-state licenses offer alternative routes. Full detail is in MN-JP Requirements 2026: Eligibility, Prerequisites & How to Qualify.
| Element | Detail |
|---|---|
| Total possible points | 240 |
| Passing threshold | 70% |
| Time allowed | 5 hours 30 minutes |
| Application fee | $50 |
| Wait time after failure | At least 30 days |
| Materials provided | Untabbed 2020 MN Plumbing Code, laws/rules booklet, basic calculator |
Scheduling Your Review Around the Scoring Reality
Because points come from calculation-heavy and diagram-based tasks as well as recall-based ones, a smart review schedule front-loads the domains most tied to numeric work, then circles back for code-navigation speed.
Calculation Foundations
- Water supply and drainage fixture unit tables (Domains 7 and 8)
- Practice sizing problems without shortcuts, using only the code book
Vents, Traps, and Storm Drainage
- Vent sizing logic (Domain 10) alongside drainage sizing to reinforce connections
- Traps, interceptors, and storm drainage chapters (Domains 11-12)
Code Navigation Speed
- Timed drills locating sections in an untabbed 2020 Minnesota Plumbing Code
- Fixture, water heater, and indirect waste chapters (Domains 5, 6, 9)
Administrative and Full Simulation
- Licensing rules, Chapter 1300, and miscellaneous statutes (Domains 14-16)
- Full-length timed practice covering all 16 domains
A full-length simulation matters more here than in exams where you can skip around freely - with 5 hours 30 minutes and a mix of task types, pacing yourself against a realistic mock exam is the only way to know if you'll actually finish. For a structured walkthrough of this entire process, see MN-JP Study Guide 2026: How to Pass on Your First Attempt, and to gauge overall difficulty going in, read How Hard Is the MN-JP Exam? Complete Difficulty Guide 2026. You can also run through timed practice sets on our practice test platform to get a feel for pacing before test day.
What Pass-Rate Data Actually Tells You
Two figures appear in Minnesota Plumbing Board minutes worth knowing, and they should not be blended together. The January 13, 2026 minutes report an 81% first-attempt journeyworker pass rate, labeled as 2025 YTD. Separately, the April 21, 2026 minutes report a 96.1% journeyworker pass rate under that same 2025 YTD label, but without specifying it's first-attempt-only. These are two different snapshots reported at two different board meetings, likely reflecting different scopes or update timing - not a single trend line.
What this means practically: most candidates who complete the required hours and prepare seriously do pass, but the exact rate depends on how "pass rate" is defined and measured at a given point in the year. Don't treat either number as a guarantee, and don't assume the exam is easier or harder than it is based on headline percentages alone. For a deeper look at how these figures were reported and what they imply for your own prep intensity, see MN-JP Pass Rate 2026: What the Data Shows.
Once you've passed, remember the license itself expires December 31 of odd-numbered years, with renewal costing $53 and requiring 16 approved continuing-education hours, at least eight of which must cover the State Plumbing Code. Passing the exam is the finish line for licensure, not the finish line for staying current. For what the credential opens up afterward, browse MN-JP Jobs and MN-JP Salary Guide 2026: Complete Earnings Analysis, or weigh the bigger picture in Is the MN-JP Certification Worth It? Complete ROI Analysis 2026.
Frequently Asked Questions
You need 70% of the 240 total points available on the written Journeyworker Plumber exam administered by the Minnesota Department of Labor and Industry.
No. Points are not a direct stand-in for question count. Some tasks, especially calculations and diagram-based sizing problems, carry more point value than a standard multiple-choice item.
No. DLI provides an untabbed 2020 Minnesota Plumbing Code, a current laws and rules booklet, and a basic calculator. Personal reference materials and electronic devices are prohibited during the exam.
You're given 5 hours and 30 minutes to complete the full written exam, which includes multiple-choice, multiple-response, calculation, and diagram-based sizing tasks.
You must wait at least 30 days before reapplying, which includes paying the $50 application fee again. Use that time to target the specific domains and task types that cost you the most points.