How to get a master plumber license in Washington
Washington master plumber licensing covers hours, prerequisites, exam path, fees, and renewal. Confirm current rules on the board source before you apply.
Verified on: 2026-09-14 · Board source
From the board
- Plumber Examination ## Plumber Examination Examination is the final step to become a certified plumber in Washington.
- Before signing up for your examination, submit your affidavits of experience documenting your required years and hours of experience, and complete your continuing education requirements.
- Once these are approved, you can submit your application to sign up to take the exam for your certification level.
- Note: Hours of experience from out-of-state employers and trainee or apprent
- Board page: Plumber Examination - Lni.wa.gov
Requirements overview
- Washington sets experience, education, and exam rules for master plumber applicants
- Documented OJT or apprenticeship hours are common for journeyman / technician paths
- Master and contractor tracks usually add experience, exams, and firm paperwork
- Confirm current hour totals, affidavits, and fees on the state board before you apply
Exam
- See the Washington plumbing exam guide for vendor, scheduling, and prep
- LicenseFlo helps with paperwork and reminders — we do not sit the exam
Renewals
- Most credentials renew on a fixed cycle with mandatory CE or training
- Roster watch → intake → assemble → sign → submit
Related: Exam · Renewal and CE
Have LicenseFlo do it
From $79 per event. Text once; we collect photos, assemble the packet, and send a one-tap signature.