Plumber License from California to Washington: Does It Transfer? (2026)
Does Washington accept a California plumbing license?
There is no California state license to carry to Washington: California issues no statewide journeyman plumber license. Washington does license this work, so ask the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program whether it credits a local license or your documented experience; otherwise you qualify as a new applicant.
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Same data, interactive — with share link and board links.
Verdict
No state license to transfer
The issue on this move is the starting point: California issues no statewide journeyman plumber license — plumbing there is regulated at the contractor level or by cities and counties — so there is no California state license for Washington to verify or endorse. Washington does license plumbers, through the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program, and it reviews out-of-state plumbers for endorsement, but that route starts from a state license. Ask the board, in writing, whether it credits a local California license, a contractor-level credential or your documented hours; otherwise plan to qualify as a new journeyman applicant. 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's different between California and Washington
Computed from both states' verified data rows, in both directions, and from the route every other origin gets into Washington. Exam notes are our summary of each board's published rules, with sources below.
- Route, each way
California to Washington (this page): No state license to transfer.
Washington to California (the reverse move): No state license to transfer.
California issues no statewide journeyman plumber license, so neither direction is a state-license transfer.
- Does coming from California matter?
Coming from California matters here: only 9 of 50 origins (the other 49 states and DC) get this result for a move into Washington.
The others get: licensure by endorsement (40) and reciprocity agreement (1).
- Reciprocity agreements
Washington's reciprocity agreement list names 1 state (Idaho), not including California.
- Fee and processing
California issues no statewide journeyman plumber license, so there is no California state license application fee or processing time to compare with Washington's.
- Exam rules on record
Washington and California carry different exam notes (our summaries, below); any state law or jurisprudence exam is listed with each state's requirements.
- Washington (this move): 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
- California (the reverse move): Not applicable at the journeyman level — California issues no state journeyman plumber license, so there is no state journeyman trade exam. Plumbing is licensed only at the contractor level by the Contractors State License Board (C-36 Plumbing). At that contractor tier, CSLB has a reciprocity agreement covering the C-36 classification with Arizona only: an Arizona C-37 or C-37R contractor who has held that license active and in good standing for the previous five years may have the C-36 trade exam waived (CSLB reserves the right to require it), but must still pass CSLB's Law and Business exam. CSLB's other reciprocity partners (Nevada, Louisiana, Mississippi, North Carolina) do not map to C-36 Plumbing.
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 | $242.70 (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
- Review Washington's requirements on the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program website (linked below) — rules change.
- Ask the Washington State Department of Labor & Industries (L&I) — Plumber Certification Program whether it credits a local California license or your documented experience: California issues no statewide journeyman plumber license, so there is no state license to verify.
- Otherwise apply as a new applicant: meet Washington's education/experience requirements and pass the exams it requires.
- Submit the application with fees listed above, and allow for the processing time shown there.
Official links
Related guides
Frequently asked questions
What happens to my California credential after I'm licensed in Washington?
Nothing changes it. California issues no statewide journeyman plumber license, so any local or contractor-level California credential you hold runs on its own authority's renewal rules, independently of your Washington license.
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 the License Reciprocity Editorial Team · verified against primary sources 2026-07-21
How we verify · All sources · Corrections log · spot an error? hello@licensereciprocity.com