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Washington Plumber License General FAQ

You must have a valid plumber certificate to work in the plumbing construction trade in Washington State.

Plumber Trainee
Journeyman Plumber- is qualified to work in all phases of plumbing construction.
Residential Specialty- is limited to installation, maintenance, and repair of plumbing in single family dwellings, duplexes, and apartment buildings which do not exceed three stories.

  1. Meet state requirements.
    • 8,000 hours work experience, which includes 4,000 hours commercial or industrial work.
  2. Complete a Journeyman & Residential Plumber Application
  3. Pay the $151.90 exam fee
  4. Pass the exam!
  • Administration
  • Definitions
  • General Regulations
  • Plumbing Math
  • Fixtures, Faucets, and Fixture Fittings
  • Water Heaters
  • Water Supply and Distribution
  • Sanitary Drainage
  • Indirect and Special Waste
  • Vents
  • Traps, Interceptors, and Separators
  • Storm Drainage
  • Appendices
  • Hands-On Practical Application

Department of Labor & Industries
Plumber Certification Program
PO Box 44470
Olympia, WA 98504-4470

Alisha Wells
360-902-5207
Email: Plumbers@Lni.wa.gov

Whitney Bowman
360-902-4666
Email: Plumbers@Lni.wa.gov

Bruce Springer
360-902-4768
Email: Bruce.Springer@Lni.wa.gov

  • Information Last Updated: 02/2020
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