Which entity administers plumber certification exams and sets Washington State's plumbing licensing requirements?
Not quite. The answer is B: Washington State Department of Labor & Industries (L&I)
Washington runs its plumbing certification program directly through L&I, which sets the requirements and contracts a testing vendor (PSI) for exam logistics — the content outline and licensing rules are the state's, not the vendor's or IAPMO's. ICC runs its own separate family of inspector certifications and has no role in Washington's journeyman licensing.
Reference: WA L&I / PSI L&I Plumber Examination page; PSI Plumbing Examinations Candidate Information Bulletin (Who administers Washington plumber exams)
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