Anyone doing plumbing work in Washington as a trainee needs an L&I plumber trainee certificate, must be 16 or older and work under direct supervision. The certificate costs $60, renews yearly with 8 hours of continuing education, and hours are reported on notarized affidavits.
Note: this link opens an official government site. It is not an application form for one vacancy, and a listing on it does not guarantee hiring.
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