Plumber License from California to Washington: Does It Transfer? (2026)
Last verified: 2026-07-21 · source: Washington State Department of Labor & Industries (L&I) — Plumber Certification Program ↗
A plumbing license transfers from California to Washington by endorsement — there is no automatic reciprocity, but you do not start over. Apply to the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program, verify your California license, and meet Washington's endorsement requirements. Washington waives its journey level (journeyman) plumber examination only for a plumber who holds a current Idaho journey level plumber certificate — the sole reciprocal state; L&I reviews the Idaho credential and issues the Washington certificate without exam. Every other out-of-state plumber must pass the Washington plumber exam; out-of-state trainee/apprenticeship hours are not accepted toward Washington certification, though a one-time 120-day temporary permit lets a non-reciprocal applicant work while awaiting the exam.
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Verdict
Licensure by endorsement
California is not among the states Washington names for an automatic exam waiver, so this move runs on the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program's individual endorsement or equivalency review rather than a guarantee. Washington waives its journey level (journeyman) plumber examination only for a plumber who holds a current Idaho journey level plumber certificate — the sole reciprocal state; L&I reviews the Idaho credential and issues the Washington certificate without exam. Every other out-of-state plumber must pass the Washington plumber exam; out-of-state trainee/apprenticeship hours are not accepted toward Washington certification, though a one-time 120-day temporary permit lets a non-reciprocal applicant work while awaiting the exam. Bring your California license, proof that it is active and in good standing, and your apprenticeship and exam records — and get any discretionary exam or experience credit in writing before you rely on it.
What changes, California → Washington
| California (current) | Washington (destination) | |
|---|---|---|
| Application fee | No state journeyman plumber license exists, so there is no journeyman fee. For reference, the CSLB C-36 plumbing CONTRACTOR license (contractor tier, out of scope) is $450 original application + $200 initial license fee (sole owner) / $350 (non-sole owner), plus a bond and Live Scan fingerprint fee. | $242.7 (Idaho reciprocal journey level applicants pay the $242.70 journey level certification fee (exam waived). Non-reciprocal out-of-state applicants pay a $202.10 examination application fee (plus a PSI scheduling fee) and then the $242.70 certification fee; a one-time 120-day temporary work permit is $100.30) |
| Processing time | Not applicable — no state journeyman plumber license is issued | L&I does not publish a fixed processing time; out-of-state credentials are reviewed before the applicant may test or receive a reciprocal certificate, and approved applications are valid for one year |
| Licensing authority | California Contractors State License Board (CSLB) | Washington State Department of Labor & Industries (L&I) — Plumber Certification Program |
The destination column is what you must satisfy — Washington sets the rules for this move.
Step by step
- Confirm Washington's current requirements on the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program website (linked below) — rules change.
- Submit the endorsement application to the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program (application linked below).
- Arrange license verification from your current state via the verification system.
- Hold a current, unexpired Idaho journey level plumber certificate (the only reciprocal state).
- Submit the Plumber Certification Application (F627-008-000) with a copy of the out-of-state license/card and a government-issued photo ID to L&I's Plumber Certification program for credential review.
- Out-of-state trainee/apprenticeship hours are NOT accepted toward Washington certification.
- Non-reciprocal out-of-state applicants must pass the Washington plumber exam; a one-time 120-day temporary permit allows work in the interim.
- Pay the fees ($242.7 (Idaho reciprocal journey level applicants pay the $242.70 journey level certification fee (exam waived). Non-reciprocal out-of-state applicants pay a $202.10 examination application fee (plus a PSI scheduling fee) and then the $242.70 certification fee; a one-time 120-day temporary work permit is $100.30)) and allow L&I does not publish a fixed processing time; out-of-state credentials are reviewed before the applicant may test or receive a reciprocal certificate, and approved applications are valid for one year.
Official links
Related guides
Frequently asked questions
Does Washington accept a California plumbing license?
A plumbing license transfers from California to Washington by endorsement — there is no automatic reciprocity, but you do not start over. Apply to the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program, verify your California license, and meet Washington's endorsement requirements. Washington waives its journey level (journeyman) plumber examination only for a plumber who holds a current Idaho journey level plumber certificate — the sole reciprocal state; L&I reviews the Idaho credential and issues the Washington certificate without exam. Every other out-of-state plumber must pass the Washington plumber exam; out-of-state trainee/apprenticeship hours are not accepted toward Washington certification, though a one-time 120-day temporary permit lets a non-reciprocal applicant work while awaiting the exam.
Which exam applies moving from California to Washington?
Washington waives its journey level (journeyman) plumber examination only for a plumber who holds a current Idaho journey level plumber certificate — the sole reciprocal state; L&I reviews the Idaho credential and issues the Washington certificate without exam. Every other out-of-state plumber must pass the Washington plumber exam; out-of-state trainee/apprenticeship hours are not accepted toward Washington certification, though a one-time 120-day temporary permit lets a non-reciprocal applicant work while awaiting the exam.
What does the California-to-Washington move cost and how long does it take?
$242.7 (Idaho reciprocal journey level applicants pay the $242.70 journey level certification fee (exam waived). Non-reciprocal out-of-state applicants pay a $202.10 examination application fee (plus a PSI scheduling fee) and then the $242.70 certification fee; a one-time 120-day temporary work permit is $100.30); processing L&I does not publish a fixed processing time; out-of-state credentials are reviewed before the applicant may test or receive a reciprocal certificate, and approved applications are valid for one year.
Can I keep my California plumbing license after I'm licensed in Washington?
Yes — plumbing licenses in different jurisdictions run independently. Keep the California credential active on its own renewal and continuing-education schedule and you hold both, which is common for plumbers working near a state line.
Sources
Primary sources only — official boards and compact commissions. Data last verified 2026-07-21.
- Washington L&I — Plumber Examination (Idaho reciprocity, out-of-state review, 120-day temporary permit, $202.10 exam fee, $100.30 permit) ↗ (accessed 2026-07-21)
- Washington L&I — Get or Renew Your Plumber Certification (fees incl. $242.70 journey level certification; F627-008-000 application form) ↗ (accessed 2026-07-21)
- CSLB — C-36 Plumbing Contractor classification detail (plumbing licensed only at contractor level) ↗ (accessed 2026-07-21)
- CSLB — Reciprocal Classifications List (C-36 reciprocity maps only to Arizona C-37/C-37R) ↗ (accessed 2026-07-21)
- CSLB — Reciprocity Exam Requirements (trade portion may be waived; Law & Business exam still required; 5-year license) ↗ (accessed 2026-07-21)
Reviewed by Billy Reiner, Editor · verified against primary sources 2026-07-21
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