Plumber licensing in Washington

Washington reciprocates with exactly one state — Idaho, journey level — as a discretionary exam waiver, and the board closes the door on everyone else in its own words: all other out-of-state plumbers pass the Washington exam. There is a consideration channel short of reciprocity — email copies of your license and photo ID for an experience-credit review — but that buys exam eligibility, never a waiver.

What Washington does offer everyone else is the best-administered temporary permit in the region; see the next section.

Yes — Washington's temporary permit is a genuine work-while-pending instrument for out-of-state journey-level plumbers from non-reciprocal states: once your credentials are approved, a one-time 120-day permit ($100.30, on top of the $202.10 exam application) lets you work at your certification level while you wait to sit the Washington exam.

The conditions are sharp: one bite ever — if you have ever held a Washington temporary permit, plumber certificate, or trainee card, you are ineligible — it is nonrenewable, and it does not cover medical-gas or backflow specialties. The trainee certificate is the universal fallback for anyone, but it is mutually exclusive with the permit: taking a trainee card spends the journey-level shortcut permanently.

Choose before you arrive.

Two steps in a fixed order: apply to Labor & Industries for eligibility ($202.10, approval good for one year), then their letter tells you how to schedule with PSI — testing centers are available across the country. Out-of-state applicants attach a copy of their license and photo ID. Reschedule with PSI at least two days out or the fee is forfeit.

The trainee certificate is both the apprentice credential and lawful day-one work authority — annual renewal, supervised under statutory ratios (with remote supervision authorized in certain circumstances), sixteen hours of classroom training, and experience accruing at 2,000 hours to the year, with at most half creditable from school.

The one warning that outranks the rest: holding a trainee card forfeits temporary-permit eligibility forever — experienced travelers should test the permit route first.

Statutory preemption with teeth: cities and counties may enforce their own plumbing codes, but no code may require a certificate holder to prove competency again, hold another license, or pay any fee to work the trade. The precision worth knowing: that protection names certificate holders — how it treats a temporary-permit or trainee worker is untested, so let the employer's permits carry the local layer.

Both credentials are real: you hold the personal certificate (or permit, or trainee card), and the employer holds the plumbing contractor license — required for advertising, bidding, and performing plumbing work, and conditioned on employing a full-time certified journey or specialty plumber. Neither covers the other.