Important licensing distinction: the Hawaii Journey Worker Plumber license does not itself authorize you to contract for plumbing work. Contracting requires a separate Hawaii contractor license under the contractor licensing laws.
Hawaii Journeyman Plumber Exam Overview
Hawaii officially uses the title Journey Worker Plumber for the license commonly called a journeyman plumber license. Applicants must receive approval from the Hawaii Board of Electricians and Plumbers before scheduling the examination.
Questions: 100
Testing time: 180 minutes, or 3 hours.
Exam format: closed book.
Experience: 5 years of qualifying plumbing experience or at least 10,000 hours.
License
Hawaii Journey Worker Plumber
Licensing Authority
Hawaii Board of Electricians and Plumbers
Testing Provider
PSI Services
Exam Questions
100
Testing Time
180 minutes | 3 hours
Exam Format
Closed book
Experience Requirement
5 years or at least 10,000 qualifying hours
Exam Approval Validity
2 years from examination approval letter
Course Study Code
1 Exam Prep course based on the 2024 UPC
Contracting Authority
Separate contractor license required to contract for plumbing work
Core Hawaii Journeyman Plumber Exam Prep Topics
General Knowledge: plumbing principles, materials, fixtures, installation practices, definitions and general trade knowledge.
Water Supply: water distribution, pressure, sizing, valves, piping materials and fixture supply.
DWV: sanitary drainage, waste piping, venting, traps, cleanouts, fittings and system sizing.
Math and Estimating: pipe sizing, fixture units, measurements, quantities, offsets, volume and applied plumbing math.
Gas and Special Systems: fuel gas, medical gas, indirect waste, special waste and building sewers.
Hawaii Journeyman Plumber Exam Topic Weighting
Bars are based on the current 100-question subject outline commonly used in Hawaii plumber exam preparation.
General Knowledge
25 questions
Water Supply Systems
20 questions
Drainage, Waste & Sanitary Vents
20 questions
Size & Estimating
10 questions
Medical & Fuel Gas Systems
10 questions
Indirect & Special Waste
10 questions
Building Sewers
5 questions
How to Prepare for a Closed-Book Hawaii Plumber Exam
Do This
- Study plumbing systems by topic
- Memorize common formulas and sizing concepts
- Practice fixture-unit calculations
- Review definitions repeatedly
- Work isometric drawings without reference books
- Complete timed 100-question practice sessions
- Finish final practice tests closed book
Avoid This
- Preparing as if references will be available during the exam
- Memorizing answer letters instead of plumbing rules
- Skipping water-supply calculations
- Ignoring DWV and vent relationships
- Avoiding gas-system review
- Ignoring special waste and building sewers
- Waiting until exam week to practice plumbing math
What the 1 Exam Prep Hawaii Course Includes
Study Guide & Practice
- 700+ practice questions
- Detailed answer explanations
- Hawaii-focused licensing review
- Test-taking strategies
- Structured study plan
Online Course
- 8+ hours of video training
- UPC chapter review
- Isometric drawing walkthroughs
- Real-world plumbing applications
- Simulated computer-based exams
- Downloadable study materials
Code-edition note: the 1 Exam Prep 2026 Hawaii course is developed around the 2024 Uniform Plumbing Code. Candidates should still confirm the official code or reference edition currently specified by Hawaii and PSI before taking the licensing exam.
Hawaii Journey Worker Plumber Licensing Roadmap
Move from qualifying plumbing experience through Board approval, exam prep, PSI testing and future license advancement.
1
Build qualifying plumbing experience
Complete five years of qualifying full-time plumbing experience or the equivalent of at least 10,000 hours.
2
Document your experience
Prepare the required experience verification for Board review.
3
Apply through the Hawaii Board
Submit the Journey Worker Plumber application and supporting documents.
4
Receive examination approval
Wait for Board approval before scheduling your exam with PSI.
5
Prepare for the closed-book exam
Study water supply, DWV, sizing, gas systems, special waste, building sewers, math and isometrics.
6
Complete timed practice exams
Practice 100-question sessions within the 180-minute exam limit.
7
Advance your plumbing career
After Journey Worker licensing, qualified plumbers may later pursue Master Plumber or separate plumbing contractor licensing.
Six-Week Hawaii Journeyman Plumber Exam Prep Plan
Week 1
General Plumbing
- Definitions
- Materials
- Fixtures
- General installation rules
Week 2
Water Supply
- Water distribution
- Pipe sizing
- Pressure
- Valves and fixtures
Week 3
DWV Systems
- Drainage
- Waste
- Sanitary vents
- Traps and cleanouts
Week 4
Gas & Special Waste
- Fuel gas
- Medical gas
- Indirect waste
- Special waste
Week 5
Math & Isometrics
- Pipe sizing
- Fixture units
- Offsets
- Isometric analysis
Week 6
Closed-Book Simulation
- 100-question practice exams
- 180-minute testing blocks
- No-reference review
- Final weak-area drills
Journeyman Plumber vs Plumbing Contractor in Hawaii
Journey Worker Plumber
- State plumber license
- Requires qualifying plumbing experience
- Requires Board approval and examination
- Allows licensed journey-worker plumbing work
- Does not independently authorize contracting
Plumbing Contractor
- Separate contractor licensing pathway
- Required to contract for plumbing work
- Subject to Hawaii contractor licensing law
- Different application and qualification requirements
- Useful future path for plumbers entering business ownership
Hawaii Journeyman Plumber Exam Prep FAQ
Hawaii Plumber Exam Basics
The Hawaii Journey Worker Plumber examination contains
100 questions.
Candidates receive 180 minutes, or three hours.
No. Current Hawaii Board information identifies
the Journey Worker Plumber examination as closed book.
PSI Services administers Hawaii plumber examinations
after the Board approves the candidate.
Licensing Requirements
Journey Worker Plumber applicants need five years of
qualifying full-time plumbing experience or its equivalent,
totaling at least 10,000 hours.
Licensing is handled through the Hawaii Department of Commerce
and Consumer Affairs, Professional and Vocational Licensing Division,
Board of Electricians and Plumbers.
Current Hawaii information states that exam eligibility
remains valid for two years from the examination approval letter.
Hawaii does not currently provide plumber-license reciprocity
with other jurisdictions.
Exam Topics & Study
Current Hawaii exam-prep outlines commonly list
General Knowledge as the largest area at 25 questions.
Current preparation outlines commonly list
20 questions covering Water Supply Systems.
Current preparation outlines commonly list
20 questions covering Drainage, Waste and Sanitary Vents.
Yes. Practice pipe sizing, fixture units,
measurements, offsets, volume and practical plumbing math.
Yes. Isometric practice helps candidates understand
drainage, venting, pipe layout and system relationships.
Yes. The 2026 Hawaii Journeyman Plumber Study Guide
and Online Course from 1 Exam Prep is developed around
the 2024 Uniform Plumbing Code.
The 1 Exam Prep course is based on the 2024 UPC,
but candidates should verify the current official exam
reference or code edition with Hawaii and PSI before testing.
Career & Contractor Path
The Journey Worker Plumber license itself does not authorize
contracting. A separate Hawaii contractor license is required
to contract for plumbing work.
Qualified plumbers may later pursue Hawaii Master Plumber
licensing after meeting the applicable experience requirements.
Start with General Knowledge, Water Supply and DWV.
Then add sizing and estimating, gas systems,
special waste, building sewers, plumbing math,
isometrics and timed closed-book practice.
Hawaii Journeyman Plumber Exam Prep Resources
Prepare for the Hawaii Journeyman Plumber Exam
Build plumbing-system knowledge, calculation accuracy, DWV understanding, water-supply knowledge, gas-system awareness, isometric skills and closed-book testing endurance for the Hawaii Journey Worker Plumber licensing exam.
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