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Washington State Licensing Requirements for Plumbers

License Title: Department of Labor and Industries

Trade/Profession: Plumbing

Licensing Agency: https://secure.lni.wa.gov/verify/

Online search page: https://secure.lni.wa.gov/verify/

Agency phone: 800-647-0982

The license information presented here is based on Angi's own ongoing research, and may be incomplete or outdated. License regulations are complex, and requirements can vary both state-by-state and based on project scope. We encourage you to check with the regulatory agencies in your area for their most up-to-date information and to confirm if licensing is required for your specific project.