Washington Plumbing Exams

The Washington Plumbing License Exam covers many topics including: Vents & Venting; Administrative Procedures; Fixtures; Drainage Systems and more.  Whether you live in Seattle, Spokane, Tacoma or another city or county, the resources below will help you get started:

Need of a License:  Journeyman and residential specialty plumbers need a license to work in Washington. 

Who Grants a License:  Plumbing licenses are issued by the Washington State Department of Labor and Industries.

Procedures for Getting a License:   Candidates for the journeyman and residential specialty plumbers license must take and pass an exam to qualify for the license.

Qualifications to take the Exam and receive a License:  A candidate for journeyman plumber  must have 8,000 hours of experience, with a minimum of 4,000 hours in commercial plumbing.  A candidate for residential specialty must have 6,000 hours of experience in residential or commercial plumbing.  All experience must be under a registered contractor and under supervision of a certified plumber.

Candidates must complete a 16 hour continuing education program, with a 4 hour minimum requirement on industry related electrical, prior to taking the journeyman and residential specialty exams.

Test Content:   The exam is in 3 parts consisting of Uniform Plumbing Code questions, a waste and vent pipe sizing drawing and a water pipe sizing drawing.   The exam generally covers the following areas:

     1.   General knowledge of technical information and practical procedures which are a necessary part of the trade; and

     2.   Specific knowledge of the requirements of the Uniform Plumbing Code.

A candidate must receive a score of 70% or better to pass the exam.  The journeyman exam will have drawings of one, two and more story buildings.  

How to Apply for the Test:  You can access the application online at Application.   Application documents can be sent to:

     Department of Labor and Industries
     PO Box 44470
     Olympia, WA  98504-4470

Applications must be received by the Olympia office at least 2 weeks before the requested examination date.

Fees:  There are fees to take the test.

License renewal:  Licenses must be renewed every two years.  Plumbers must complete a minimum of 16 hours of continuing education to renew a license.

Applicable Code:    Washington's local municipalities have adopted the International Plumbing Code (IPC) or the Uniform Plumbing Code (UPC)..


For more information on licensing and exam preparation, go to Tests.com's

Journeyman Plumbing Test Guide

Master Plumbing Test Guide

And take Tests.com's Plumbing Practice Test.

For plumbing exam preparation products and services, such as study guides, practice tests, flashcards and courses, go to Tests.com's Journeyman Plumber Exam and Master Plumber Exam listings.