How to get a Plumbing license in Washington
The full Washington plumbing licensing path — experience hours, required exam, fees, and where to apply. Verified 6/12/2026.
Career prep, not a license.
Prep for the Washington Plumbing exam
Plumbing 101 — Start Here (Free) — self-paced lessons, practice exam, certificate of completion.
Washington Certified Plumber (PL01 Journey / PL02 Residential / PL03 Specialty)
Frequently asked questions
How do I get a plumbing license in Washington?
You need pl01 journey: 8,000 hrs supervised + 4 yrs apprenticeship classroom. pl02 residential: 6,000 hrs.. Then pass the Washington Plumber Examination (UPC + WAC 296-400A) administered by PSI Services. Applications go through the Washington State Department of Labor & Industries (L&I).
What exam do I need to pass?
Washington Plumber Examination (UPC + WAC 296-400A) — administered by PSI Services.
How much experience do I need?
PL01 Journey: 8,000 hrs supervised + 4 yrs apprenticeship classroom. PL02 Residential: 6,000 hrs.
What about fees, insurance, and continuing education?
Individual plumbers need a Certificate of Competency; the business is separately licensed as a Plumbing Contractor with bond ($6k+) and $200k liability. CEU: 16 hrs per 3-yr renewal. Certificate ~$76/3yrs, contractor $359/2yrs.
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