Plumber Exam Prep / Washington
Plumber Exam — WA
Journeyman Plumber Exam in Washington
Complete breakdown of the journeyman plumber licensing process in Washington — code used, exam provider, and what to study.
Exam Details
- Licensing Body
- Washington Labor & Industries
- Exam Provider
- PSI Exams
- Code Edition
- 2018 UPC
- Passing Score
- 75%
- Question Count
- 80
- Exam Fee
- $44
- Experience Required
- 4 years (8,000 hours)
Note: Always verify current requirements with Washington Labor & Industries.
How Washington Compares Nationally
- Washington's $44 plumbing exam fee sits below the national median of about $65.
- Washington still uses the 2018 UPC, a cycle or two behind the 2021 edition some states have adopted — confirm the exact edition before you test.
- The 75% passing bar is higher than the 70% most states require, so build in extra margin.
Washington Plumber License — What to Know
Washington requires 75% to pass and uses the UPC. Separate endorsements for residential and commercial plumbing.
Key Code Sections to Master
The Uniform Plumbing Code (UPC) exam covers similar topics to the IPC but with different numbering. Focus on water supply pipe sizing (Table 6-4), drainage fixture units (Table 7-3), venting requirements (Chapter 9), and fixture installation requirements (Chapter 4). The UPC is generally considered stricter on venting requirements than the IPC.
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Practice for the Washington plumber exam
Use this state guide to understand the license requirements, then drill IPC and UPC practice in your browser with pipe-sizing tools. Web access and native app purchases are separate.
Washington Journeyman Plumber Exam — Frequently Asked Questions
How do I get my journeyman plumber license in Washington?
In Washington, the journeyman plumber license is issued by Washington Labor & Industries. The exam uses the 2018 UPC and is administered by PSI Exams. You need 4 years (8,000 hours) of experience. The exam fee is $44 and the passing score is 75%. Washington requires 75% to pass and uses the UPC. Separate endorsements for residential and commercial plumbing.
What plumbing code is used in Washington?
Washington uses the 2018 UPC for its journeyman plumber exam. The exam has 80 questions with a passing score of 75%. The exam is administered by PSI Exams.
What is the difference between IPC and UPC on the plumber exam?
Washington uses the Uniform Plumbing Code (UPC). The UPC covers similar topics to the IPC but with different article numbering. Key tables: Table 6-4 (water supply) and Table 7-3 (drainage fixture units). The UPC is generally considered stricter on venting requirements than the IPC.
What is the best app to study for the Washington plumber exam?
VoltExam offers Washington journeyman plumber exam prep on the web with IPC/UPC practice questions, explanations, state guidance, and built-in pipe sizing tools. Native mobile apps are available separately for offline study.