Minnesota Journeyworker Plumber Book Package

Prepare for the Minnesota Journeyworker Plumber licensing examination with a focused reference package built around the Minnesota Plumbing Code, 2020 and the state laws and regulations identified for Minnesota plumbing examinations. The Minnesota Journeyworker Plumber Book Package provides the primary code material candidates need to study water distribution, drain-waste-vent systems, plumbing fixtures, backflow prevention, materials, storm drainage, plumbing calculations, installation requirements, and the state laws governing licensed plumbing work.

The Minnesota Journeyworker Plumber license is administered by the Minnesota Department of Labor and Industry. A Journeyworker Plumber is an individual who performs practical plumbing work as an employee of, or otherwise under the direction of, a Master Plumber. The credential authorizes qualifying plumbing work statewide and is an important milestone for plumbers who have completed the required practical experience or an approved apprenticeship pathway.

The current examination is based on the 2020 Minnesota Plumbing Code and applicable material from Chapter 4714, Chapter 144, Chapter 325, and Chapter 326. The Minnesota Plumbing Code incorporates the 2018 Uniform Plumbing Code with Minnesota amendments and regulates plumbing-system design and installation throughout the state.

Journeyworker-level preparation requires more than knowing how plumbing systems are installed in the field. Candidates should understand the code requirements behind those installations and be able to apply tables, definitions, formulas, sizing rules, installation standards, and Minnesota-specific requirements to examination problems. The exam is designed to measure practical application of plumbing knowledge rather than simple memorization.

This package supports both technical code study and preparation for the laws and regulations that apply to licensed plumbers in Minnesota. Candidates should become comfortable using the plumbing code as a working reference while developing a solid understanding of common plumbing calculations and system requirements.

Exam Details

The Minnesota Journeyworker Plumber examination is administered by the Minnesota Department of Labor and Industry. It is designed to evaluate whether the applicant has the knowledge and practical understanding needed to perform plumbing work within the scope of a Journeyworker Plumber license.

• Exam: Minnesota Journeyworker Plumber Licensing Examination
• Licensing Agency: Minnesota Department of Labor and Industry
• Exam Value: 240 points
• Time Allowed: 5.5 hours
• Passing Score: 70%
• Exam Type: Open book using Department-provided reference materials
• Primary Reference: 2020 Minnesota Plumbing Code
• Additional Material: Applicable Minnesota laws and rules

The examination may use several question formats. Many questions are multiple choice, while calculation questions may require an exact answer rather than selecting from a list. Some questions may require more than one correct selection, and examination problems may contain extra information that candidates must separate from the facts needed to solve the question.

The Department’s examination guide identifies broad knowledge areas for Journeyworker Plumber candidates, including plumbing principles, definitions, general regulations, fixtures, water supply and distribution, drainage systems, venting, traps, interceptors, indirect waste, storm drainage, materials, testing, and calculations.

The examination is intended to measure application of plumbing knowledge. Candidates should be able to identify the controlling code requirement, locate it efficiently, and apply it correctly to a practical installation or sizing problem.

Open Book Test

The Minnesota Journeyworker Plumber examination is an open book test.

The Minnesota Department of Labor and Industry provides the 2020 Minnesota Plumbing Code, applicable laws and rules material, and an electronic desktop-style calculator for use throughout the examination. Outside reference materials and personal electronic devices are not permitted in the examination area.

The Department-provided code does not include personal tabs or other navigation aids. Candidates therefore benefit from becoming familiar with the structure of the Minnesota Plumbing Code before examination day.

Open-book testing does not mean candidates can rely on searching for every answer. The Department’s examination guide states that most questions are intended to be answered without requiring the applicant to look up every provision. Strong preparation allows candidates to recognize the subject immediately and use the code to confirm details rather than searching from the beginning each time.

Practice should include locating major plumbing subjects quickly. Candidates should know where to find water supply and distribution requirements, fixture rules, sanitary drainage tables, venting requirements, storm drainage provisions, approved materials, backflow requirements, and general installation standards.

Licensing Steps

1. Register and gain qualifying plumbing experience. One common pathway begins as a Minnesota DLI-registered unlicensed plumber working under the required supervision.
2. Complete the required practical experience. Registered unlicensed plumbers generally need four years and at least 7,000 hours of qualifying plumbing experience before applying for the Journeyworker examination.
3. Meet the required experience categories. Qualifying experience must include at least 2,000 hours of water distribution system installation, 2,000 hours of drain-waste-vent system installation, and 1,000 hours of fixture installation.
4. Use an approved apprenticeship pathway when applicable. Completion of a DLI-registered plumbing apprenticeship program is another qualifying route.
5. Use another qualifying pathway when applicable. Certain restricted plumber licenses, qualifying out-of-state plumber licenses, military plumbing experience, and approved educational or apprenticeship experience may also contribute to eligibility under Minnesota rules.
6. Verify the required experience. Qualifying plumbing experience must be properly certified and documented as required by the Minnesota Department of Labor and Industry.
7. Apply for the Journeyworker Plumber examination. Submit the examination application through the Department’s licensing system.
8. Receive approval to test. The Department reviews the applicant’s qualifications before scheduling authorization is provided.
9. Study the Minnesota Plumbing Code. Prepare with the 2020 Minnesota Plumbing Code and applicable state laws and rules.
10. Practice plumbing calculations. Review water pipe sizing, DWV sizing, storm drainage calculations, and other code-based mathematical problems.
11. Take the Journeyworker examination. Complete the 240-point examination within the 5.5-hour testing period.
12. Earn the required passing score. A minimum score of 70% is required.
13. Complete the licensing process. Successful candidates receive instructions for obtaining the Journeyworker Plumber license.
14. Maintain continuing education. Complete the required continuing education during each two-year license period.

State Requirements

A Minnesota Journeyworker Plumber is an individual, other than a Master Plumber, who performs practical plumbing work as an employee of or under the direction of a Master Plumber. The license authorizes qualifying plumbing work statewide.

The scope includes both interior plumbing and qualifying exterior work involving water service, sanitary sewer, and storm sewer systems within property lines.

For a registered unlicensed plumber following the standard experience pathway, Minnesota requires at least four years of recorded practical plumbing experience. One year of qualifying practical plumbing experience is calculated as at least 1,750 hours, and no more than 1,750 hours can be credited for a single calendar year.

The standard experience requirement for a registered unlicensed plumber totals at least 7,000 hours. Within those hours, the candidate must document at least 2,000 hours installing water distribution systems, 2,000 hours installing drain-waste-vent systems, and 1,000 hours installing plumbing fixtures. The remaining qualifying hours may be earned in other aspects of plumbing work recognized by the state.

Plumbing experience must be properly verified. For many applicants, the licensed Master Plumber responsible for the work must certify the practical experience performed by the candidate.

Minnesota also recognizes other pathways. An applicant may qualify by completing a DLI-registered apprenticeship program, through certain restricted plumber credentials combined with qualifying practical experience, or through an out-of-state license issued by a jurisdiction that requires at least four years of practical experience and an examination for licensure.

The Journeyworker Plumber license is an individual credential and should be distinguished from a Minnesota Plumbing Contractor license. A plumbing contractor is a business credential, while the Journeyworker license authorizes the individual to perform plumbing work within the applicable scope and supervision structure.

Journeyworker Plumber licenses are subject to continuing education. Minnesota requires 16 hours of approved continuing education during each two-year license period. At least eight hours must relate to the State Plumbing Code, while the remaining hours must address qualifying plumbing code, technical plumbing, State Building Code, or Minnesota plumbing-law topics.

Reference Books

• Minnesota Plumbing Code, 2020 — Chapter 4714, Chapter 144, Chapter 325, and Chapter 326
  This package provides the primary code and statutory material used for Minnesota Journeyworker Plumber exam preparation. Chapter 4714 supplies the core technical plumbing requirements, while the accompanying statutory chapters support preparation for the state laws and regulatory subjects included in the examination framework.

The 2020 Minnesota Plumbing Code took effect in December 2021. It incorporates the 2018 Uniform Plumbing Code with Minnesota amendments and establishes statewide requirements for plumbing systems in new construction, additions, alterations, repairs, and replacement work.

The code addresses approved materials, installation methods, drain-waste-vent systems, potable water supply and distribution, backflow prevention, plumbing fixtures, roof drainage, water conditioning equipment, and other plumbing systems.

Exam Room Approved Books

• 2020 Minnesota Plumbing Code
  The Minnesota Department of Labor and Industry provides the current adopted 2020 Minnesota Plumbing Code for use throughout the Journeyworker Plumber examination.
• Minnesota Laws and Rules Examination Material
  The Department provides its current laws and rules booklet for the examination. The booklet reflects applicable laws and rules in effect when the examination is administered.

Candidates may not bring their own codebooks, personal reference material, tabs, electronic devices, or other outside study aids into the examination area. The references in this package are intended for preparation so candidates can become familiar with the material before working with the Department-provided copies on test day.

Test Information and Study Materials

Basic Plumbing Principles: Review the principles that protect potable water, provide sanitary waste disposal, maintain trap seals, protect public health, and support safe plumbing installations.

Definitions: Learn key definitions used throughout the code. Terms involving fixtures, drainage systems, water supplies, vents, backflow, occupancy, approved materials, and system components can affect how a requirement applies.

General Regulations: Study workmanship, piping protection, structural penetrations, trenching, supports, materials, testing, prohibited practices, and general installation requirements.

Plumbing Fixtures: Review fixture installation, fixture fittings, connections, waste outlets, water supplies, accessibility-related installation conditions, and special fixture requirements.

Water Supply and Distribution: Study water service piping, distribution piping, pressure, pipe sizing, fixture units, valves, materials, cross-connection control, and water distribution design.

Backflow Prevention: Review approved backflow-prevention methods and learn when different devices or air gaps are required. Understand the distinction between backpressure and backsiphonage conditions.

Sanitary Drainage: Study drainage fixture units, pipe sizing, horizontal branches, stacks, building drains, building sewers, slope requirements, cleanouts, and approved drainage fittings.

Venting: Review vent sizing, individual vents, common vents, wet venting, circuit venting, vent terminals, developed length, and restrictions affecting vent installation.

Traps: Study trap sizing, trap seals, prohibited trap configurations, trap arms, vent relationships, and installation limitations.

Interceptors: Review grease interceptors, oil and flammable-waste interceptors, special waste systems, and the conditions requiring interception before discharge.

Indirect Waste: Study air gaps, indirect waste piping, receptors, equipment connections, food-service applications, and methods used to protect against contamination.

Storm Drainage: Practice sizing roof drains, vertical conductors, horizontal storm piping, and storm systems using roof area and applicable rainfall information.

Water Pipe Sizing: Practice using fixture-unit values, developed length, pressure information, elevation, and code tables to size water distribution systems correctly.

Drain-Waste-Vent Calculations: Work through examples involving fixture-unit loads, drainage pipe sizing, stack sizing, branch sizing, vent sizing, and building sewer requirements.

Materials: Review approved piping materials, fitting materials, joining methods, transition fittings, corrosion protection, and restrictions on specific materials.

System Testing: Learn the testing requirements for drainage, vent, water, and other plumbing systems, including acceptable methods and procedures.

Code Navigation: Develop familiarity with the order of the code chapters. Because the Department-provided examination book does not contain personal tabs, candidates should be comfortable using the table of contents, index, and general chapter structure.

Question Strategy: Some examination questions contain information that is not needed to solve the problem. Identify the actual plumbing issue first, select the applicable code section or calculation method, and avoid being distracted by unnecessary details.

Multiple-Answer Questions: Some questions may require more than one correct selection. Read instructions carefully and confirm every required condition before choosing the answer.

Timed Preparation: Candidates have 5.5 hours for a 240-point examination. Practice answering familiar code questions efficiently so additional time is available for detailed searches and calculations.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Minnesota Journeyworker Plumber candidates organize preparation around the technical code requirements and practical plumbing knowledge measured by the state licensing examination. The Minnesota Journeyworker Plumber Book Package provides a focused foundation for code study, plumbing calculations, and regulatory review.

Trade-focused preparation helps candidates work through water distribution, drainage, venting, fixtures, backflow prevention, storm drainage, approved materials, testing, traps, interceptors, and other important plumbing subjects in a structured way.

Reference-navigation practice is especially useful because the examination provides a Minnesota Plumbing Code without personal tabs or navigation aids. Candidates who know how the code is organized can move more efficiently between definitions, tables, chapters, and specific technical requirements.

Practice-oriented preparation also helps candidates turn field experience into exam-ready knowledge. Practical plumbing experience is important, but licensing questions often require candidates to identify the exact code requirement, recognize an exception, perform a calculation, or apply a table rather than relying only on customary field practices.

Calculation practice should be part of a complete study plan. Candidates should work with water pipe sizing, drainage fixture units, vent sizing, and storm drainage calculations until the process becomes familiar.

1 Exam Prep supports candidates through organized study guidance, trade-focused review, plumbing calculations, code navigation, and confidence-building study structure. The goal is to help candidates approach the Minnesota Journeyworker Plumber examination with stronger familiarity with the code and licensing requirements without guaranteeing a specific examination score or license outcome.

Frequently Asked Questions

What is included in the Minnesota Journeyworker Plumber Book Package?

The package includes the Minnesota Plumbing Code, 2020 with preparation material covering Chapter 4714 and the applicable provisions of Chapters 144, 325, and 326.

Who administers the Minnesota Journeyworker Plumber exam?

The Minnesota Department of Labor and Industry administers the Journeyworker Plumber licensing examination.

Is the Minnesota Journeyworker Plumber examination open book?

Yes. The examination is an open book test. The Department provides the Minnesota Plumbing Code, applicable laws and rules material, and a calculator for use during testing.

Can I bring my own plumbing code into the exam?

No. The Minnesota Department of Labor and Industry supplies the examination references. Outside materials and personal electronic devices are not permitted in the examination area.

How long is the Journeyworker Plumber exam?

Candidates receive 5.5 hours to complete the examination.

How is the examination scored?

The Minnesota Journeyworker Plumber examination consists of 240 points, and a minimum score of 70% is required to pass.

How much experience is required before taking the Journeyworker exam?

Under the standard registered unlicensed plumber pathway, candidates need four years and at least 7,000 hours of qualifying practical plumbing experience, including required experience in water distribution, drain-waste-vent systems, and fixture installation.

How many hours must be in water distribution work?

The standard registered unlicensed plumber pathway requires at least 2,000 hours of water distribution system installation.

How many hours must be in drain-waste-vent work?

The standard pathway requires at least 2,000 hours of drain, waste, and vent system installation.

How many fixture installation hours are required?

The standard pathway requires at least 1,000 hours of plumbing fixture installation.

What work can a Minnesota Journeyworker Plumber perform?

The license authorizes qualifying plumbing work statewide, including interior plumbing and exterior water service, sanitary sewer, and storm sewer systems within property lines while working within the applicable Minnesota licensing structure.

Does Minnesota require continuing education for Journeyworker Plumbers?

Yes. Journeyworker Plumbers must complete 16 hours of approved continuing education during each two-year license period, including at least eight hours related to the State Plumbing Code.

What subjects should I focus on while studying?

Focus on water distribution, sanitary drainage, venting, fixtures, backflow prevention, traps, interceptors, indirect waste, storm drainage, approved materials, testing, plumbing calculations, Minnesota laws and rules, and efficient code navigation.