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.
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.
Start on the web
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.