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WA · Plumbing

Plumbing in Washington

What we confirmed about the path from apprentice to journeyman plumber in Washington, with the official link for each item. Anything we couldn’t confirm is flagged.

A plumber in work gloves fits a pipe connection

Licensing rules

Plumbing licensing rules
Who licenses this trade State: plumber trainee, journey level (PL01) and specialty plumber certificatesOfficial source: lni.wa.gov
Apprentice registration Yes. Start as a certified plumber traineeOfficial source: lni.wa.gov
Experience before the journeyman exam 4+ years (at least 8,000 hours) as a plumber trainee under a certified journey-level plumber; at least 4,000 commercial/industrialOfficial source: lni.wa.gov
Apprentices per supervisor Not yet confirmed with an official source, check the official link.
Who can supervise an apprentice A certified journey-level plumberOfficial source: lni.wa.gov

Last checked . 4 of 5 items confirmed against official sources; flagged items are still pending. Main board: Washington Department of Labor & Industries (L&I), Plumbing Program.

Plumbers and apprentices in Washington

No profiles in Washington yet. Every profile is opt-in, so the list starts empty and grows as people join.

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Next steps

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Electrical in Washington · HVAC in Washington · Washington overview · Plumbing in every state