In order to become a licensed plumber in Washington, you need to meet state requirements, that is: Showing equivalent experience in another state or while serving in the militaryĪpplications must be sent online or by mail at least two weeks prior to the exam to give the L&I time to process it.Passing an exam, with a non-refundable fee of $151.90.When the plumbers from all other states are in question, they can be considered for reciprocity upon meeting these requirements: Washington only has a reciprocity agreement with the state of Idaho, meaning that if you are licensed there, you will be allowed to perform your work in Washington as well. Average Salary of Plumbers in Washington.Washington Plumbing Apprenticeship/Trainee Requirements.
Washington Plumbing License Requirements.Washington Plumbing License Reciprocity.