Current Minnesota Journeyworker format: DLI publishes the examination as a 240-point test with a 5.5-hour time limit and a 70% passing score, equal to 168 points. The exam uses the 2020 Minnesota Plumbing Code, which incorporates the 2018 UPC with Minnesota amendments.
What Is the Minnesota Journeyworker Plumber Exam?
The Minnesota Journeyworker Plumber examination is administered by the Minnesota Department of Labor and Industry. DLI's current examination guide publishes the test as a 240-point examination with 5.5 hours allowed and a 70 percent passing score.
Minnesota's exam preparation is different from many other open-book plumbing tests because DLI provides the allowed exam references and calculator. Candidates should know the Minnesota Plumbing Code structure before exam day rather than relying on a personally tabbed or highlighted code book.
Exam answer: 240 points, 5.5 hours, 70% passing score and a 168-point passing threshold.
Code answer: the current 2020 Minnesota Plumbing Code incorporates the 2018 Uniform Plumbing Code with Minnesota-specific amendments.
Reference answer: DLI provides the exam code book, plumbing laws and rules reference and calculator. Candidates should not plan on bringing their own tabbed code book.
DLI publishes detailed knowledge areas rather than an official percentage-by-topic blueprint. This page therefore avoids inventing official question weights or treating 240 points as 240 questions.
This page uses 10 official Minnesota DLI authority resources for exam, code, experience, scheduling, contractor and reciprocity information, with commercial sources used only for supplemental study-topic research.
Minnesota Journeyworker Plumber Exam Domains
These study areas are built from the official DLI knowledge guide and current Minnesota Plumbing Code structure. DLI does not publish an official percentage for each topic.
| Exam Area | What to Study | Official Weight |
|---|---|---|
| Minnesota Plumbing Code and General Regulations | Code administration, definitions, general requirements, Minnesota amendments and licensing rules | DLI knowledge area, percentage not published |
| Plumbing Math and Formulas | Trade math, dimensions, developed length, sizing formulas, fixture units and system calculations | DLI knowledge area, percentage not published |
| Water Supply and Distribution | Water service, distribution sizing, pressure, fixture-unit demand, valves and potable-water protection | DLI knowledge area, percentage not published |
| Drain, Waste and Vent | Sanitary drainage, pipe sizing, slope, branches, stacks, cleanouts, vent arrangements and trap-arm limits | DLI knowledge area, percentage not published |
| Fixtures and Fixture Fittings | Fixture installation, clearances, connections, fixture units, materials and Minnesota requirements | DLI knowledge area, percentage not published |
| Water Heaters | Water-heater installation, relief protection, connections, clearances and applicable code rules | DLI knowledge area, percentage not published |
| Backflow and Cross-Connection Control | Backflow prevention devices, air gaps, cross-connection protection and potable-water safety | DLI knowledge area, percentage not published |
| Traps, Interceptors and Separators | Trap requirements, interceptors, separators, trap arms and prohibited arrangements | DLI knowledge area, percentage not published |
| Indirect and Special Waste | Indirect waste, receptors, special waste systems, discharge methods and special fixtures | DLI knowledge area, percentage not published |
| Storm Drainage | Roof drainage, storm sizing, rainfall calculations, leaders, conductors and storm sewer concepts | DLI knowledge area, percentage not published |
| Materials, Joints and Connections | Approved materials, joining methods, fittings, support, protection and workmanship requirements | DLI knowledge area, percentage not published |
| Testing and Inspections | System testing, inspection procedures, code compliance and verification requirements | DLI knowledge area, percentage not published |
| Isometric Drawings and Pipe Sizing | System layout, fixture units, developed length, pipe sizing, flow direction and code application | DLI calculation area, percentage not published |
Minnesota Journeyworker Plumber Exam Breakdown
Journeyworker Exam240 points | 5.5 hours | 168 points to pass
Exam AdministratorMinnesota Department of Labor and Industry
Exam FormatOpen-reference exam using DLI-provided materials
Current Plumbing Code2020 Minnesota Plumbing Code
Model Code Basis2018 Uniform Plumbing Code with Minnesota amendments
Experience Requirement7,000 hours over 4 years
Water Distribution ExperienceAt least 2,000 hours
DWV ExperienceAt least 2,000 hours
Fixture Installation ExperienceAt least 1,000 hours
Minnesota Journeyworker Plumber Licensing and Contractor Career Path
Minnesota officially uses the title Journeyworker Plumber. Many candidates still search for Journeyman Plumber exam prep, so this page uses both terms while following DLI's current licensing language.
Experience requirement: complete four years and 7,000 hours of qualifying practical plumbing experience.
Experience mix: include at least 2,000 hours of water distribution work, 2,000 hours of drain-waste-vent work and 1,000 hours of fixture installation.
Journeyworker-to-Master path: after licensure, complete at least one year of practical plumbing experience as a licensed Journeyworker before qualifying for the Master Plumber examination.
Contractor path: a Minnesota plumbing contractor must have a properly associated responsible licensed individual who holds an active Master Plumber license.
Minnesota Journeyworker Plumber Exam Prep Priorities
DLI does not publish official percentage weights. These bars show study priorities based on the breadth of DLI's official knowledge areas and calculation examples, not official exam percentages.
Minnesota Plumbing Code NavigationHighest priority
DWV and VentingHighest priority
Water Distribution and BackflowHigh priority
Plumbing Math and Isometric CalculationsHigh priority
Fixtures, Water Heaters, Traps and InterceptorsHigh priority
Storm Drainage, Special Waste and TestingSupporting priority
Minnesota Licensing and Contractor RulesRequired state prep
Minnesota Journeyworker Plumber Exam References
DLI provides the exam reference materials. Minnesota candidates should train for code familiarity rather than depending on personal tabs and highlights.
| Reference | Primary Use | Exam-Day Rule |
|---|---|---|
| 2020 Minnesota Plumbing Code | Core plumbing code, drainage, venting, fixtures, water distribution, backflow, waste, storm drainage and system sizing | Provided by DLI during the exam |
| Minnesota Plumbing Laws and Rules | Licensing, supervision, code administration and state requirements | Provided by DLI during the exam |
| DLI Electronic Calculator | Plumbing math, water sizing, DWV calculations, storm drainage and other numerical work | Provided by DLI |
| 2024 IPC Study Materials | General plumbing-system practice, math, isometrics and newer code concepts used in the 2026 course | Not the current Minnesota exam code; prioritize the 2020 Minnesota Plumbing Code for state-specific prep |
Your Minnesota Journeyworker Plumber Licensing Roadmap
Register properly, complete 7,000 hours over four years, apply through DLI, prepare from the current Minnesota Plumbing Code, pass the 240-point exam and then continue toward Master Plumber and plumbing contractor responsibility.
1
Work as a registered unlicensed plumber
Maintain the required Minnesota registration and work under the direct supervision required by DLI.
2
Complete 7,000 qualifying hours
Build four years of practical experience, including the required water distribution, DWV and fixture-installation hours.
3
Apply through Minnesota DLI
Submit the Journeyworker examination application and required experience record.
4
Study the 2020 Minnesota Plumbing Code
Learn the code structure, Minnesota amendments and where major system rules are located.
5
Master calculations and isometrics
Practice water distribution, DWV, storm sizing, developed length, fixture units and isometric analysis.
6
Take the DLI Journeyworker exam
Complete the 240-point examination within 5.5 hours and earn at least 168 points.
7
Advance toward Master and contractor responsibility
Gain at least one year of Journeyworker experience, qualify for the Master exam and continue toward responsible Master Plumber status for a plumbing contractor.
Six-Week Minnesota Journeyman Plumber Exam Prep Plan
Week 1
Code Structure and DLI Rules
- Review the DLI exam guide
- Learn Minnesota Plumbing Code organization
- Review general regulations
- Take a diagnostic practice exam
Week 2
Drainage and Venting
- Sanitary drainage
- Pipe sizing and slope
- Vent systems
- Trap-arm limits and cleanouts
Week 3
Water Supply and Backflow
- Water distribution sizing
- Fixture-unit demand
- Pressure and valves
- Backflow prevention
Week 4
Fixtures, Water Heaters and Waste
- Fixtures and clearances
- Water heaters
- Traps and interceptors
- Indirect and special waste
Week 5
Math, Storm Drainage and Isometrics
- Plumbing formulas
- Storm sizing
- Developed length
- Isometric analysis
Week 6
Long-Form DLI Simulation
- Extended timed practice
- Code-location drills without personal tabs
- Calculation review
- Final weak-area review
Minnesota Open-Reference Journeyworker Plumber Exam Prep Strategy
Do this during exam prep
- Learn the 2020 Minnesota Plumbing Code chapter structure
- Practice finding rules without relying on personal tabs
- Memorize common formulas and sizing workflows
- Practice DWV, water and storm calculations repeatedly
- Work isometric drawings under time pressure
- Build endurance for a 5.5-hour exam
Avoid these mistakes
- Treating 240 points as 240 questions
- Studying from the 2024 IPC as if it were the current Minnesota exam code
- Planning to bring a personally tabbed code book
- Using old March-and-September-only scheduling information
- Ignoring Minnesota-specific amendments
- Practicing short quizzes without long-form exam endurance
Open-reference strategy: know the code structure before exam day. DLI provides the reference materials, so your advantage comes from quickly recognizing the correct chapter, table, formula and amendment instead of depending on a customized book.
Minnesota Journeyman Plumber Contractor Exam Prep Options
2026 Minnesota Study Guide + Online Course
Guided Plumbing Exam Prep
- 700+ practice questions
- Video training
- Plumbing math
- Isometric walkthroughs
- Simulated exam practice
2026 Minnesota Journeyman Plumber Study Guide
Focused Independent Study Prep
- Plumbing-system review
- Trade calculations
- Isometric analysis
- Practice questions
- General licensing prep
Complete Books, Tabs and Course Package
Comprehensive General Plumbing Study
- Study guide and online course
- Code-study materials
- Practice questions
- Video instruction
- Use Minnesota DLI references for state-specific exam prep
Minnesota code reminder: the 2026 1 Exam Prep products above use the 2024 IPC for general study. The current Minnesota licensing examination uses the 2020 Minnesota Plumbing Code based on the 2018 UPC with Minnesota amendments. Prioritize DLI's current code and exam guide for state-specific preparation.
Journeyworker Plumber and Plumbing Contractor Are Different Minnesota License Levels
The Journeyworker Plumber license verifies trade competency after the required practical experience and state examination. Plumbing contractor responsibility comes later through the Master Plumber pathway.
· Journeyworker exam: 240 points
· 5.5-hour testing limit
· 70% minimum passing score
· 2020 Minnesota Plumbing Code
· 7,000 hours over four years
· Contractor businesses require a responsible Master Plumber
Minnesota Journeyman Plumber Contractor Exam Prep FAQ
Minnesota Journeyworker Plumber Exam Basics
The current Minnesota DLI examination guide describes the Journeyworker Plumber examination as a 240-point exam. Candidates need at least 70 percent, or 168 points, to pass.
The current DLI examination guide allows 5.5 hours for the Journeyworker Plumber examination.
It is an open-reference exam, but DLI provides the allowed reference materials and calculator. Candidates do not bring their own personally tabbed plumbing code book into the exam.
The current exam is based on the 2020 Minnesota Plumbing Code, which incorporates the 2018 Uniform Plumbing Code with Minnesota amendments.
Minnesota's current plumbing code is based on the 2018 UPC with Minnesota-specific amendments. It is not currently based on the 2024 IPC.
The current official DLI guide publishes the exam as 240 points and does not identify an official total question count. Avoid treating 240 points as 240 questions.
DLI provides the current Minnesota Plumbing Code, the applicable plumbing laws and rules material, and an electronic calculator for the exam.
No. DLI provides the exam reference materials. The supplied Minnesota Plumbing Code does not include personal tabs or other study aids.
A minimum score of 70 percent is required, which equals 168 points out of the 240-point examination.
The standard pathway requires four years of recorded practical plumbing experience totaling 7,000 hours.
Current DLI guidance for registered unlicensed plumbers requires at least 2,000 hours of water distribution installation, 2,000 hours of drain, waste and vent installation, 1,000 hours of fixture installation, with the remaining qualifying hours in other plumbing work.
Minnesota uses the term registered unlicensed plumber for many workers who would traditionally be called apprentices. They must be properly registered and work under the required direct supervision.
Study Minnesota Plumbing Code rules, general regulations, plumbing math, water supply, drainage, venting, fixtures, water heaters, backflow prevention, traps and interceptors, special waste, storm drainage, materials, testing, inspections and isometric drawing analysis.
Yes. DLI's examination guide includes isometric and system-sizing concepts, so candidates should practice reading and solving drainage, venting, water-distribution and piping-layout problems.
Plumbing math is a major preparation area because the DLI guide includes sizing and calculation examples for water distribution, drain-waste-vent systems, storm systems and isometric work.
After DLI approves the application, candidates receive scheduling instructions and select from available dates and locations through the state's iMS scheduling process.
No. Current DLI scheduling is broader than the older twice-a-year model. Approved candidates schedule from available dates and locations through DLI.
Current DLI guidance requires unsuccessful candidates to wait at least 30 days before reapplying to take the examination.
Minnesota Master Plumber and Contractor Career Path
A common path is Registered Unlicensed Plumber, Journeyworker Plumber, Master Plumber, then responsible Master Plumber for a licensed plumbing contractor business.
Current DLI guidance requires at least one year of practical plumbing experience as a licensed Journeyworker Plumber before qualifying for the Master Plumber examination.
Yes. A Minnesota plumbing contractor must have a responsible licensed individual who holds an active Master Plumber license and is properly associated with the business.
Minnesota currently has Journeyworker and Master Plumber reciprocity agreements with North Dakota and South Dakota, subject to DLI's current conditions.
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