This exam is required to be passed to obtain your State license. We stock all reference books in our online store. Shipping is always fast and affordable.
About This License
Allows the installation, alteration, or repair of portable water, liquid waste, and medical gas systems within a building in the state of Washington you must be certified by the Department of Labor and Industries. The Department issues trainee, journeyman, and speciality/residential plumber certificates, and medical gas piping installer endorsements.