Washington State Department of Labor and Industries · checked 2026-10-21
Washington Plumber License Requirements
Statewide plumber certificate of competency issued by L&I under chapter 18.106 RCW, with journey level and specialty certificates. Journey level plumber: 4 years of experience at minimum, plus an exam.
- 1JL · Journey level plumber 4 years
License levels in Washington
Washington has one credential on this path: the Journey level plumber. The source counts experience in hours; the "time from start" column turns those hours into full-time years at 2,000 hours a year.
| Level | Experience | Classroom | Time from start | Exam | Fees |
|---|---|---|---|---|---|
| JL Journey level plumber | 8,000 hours | — | 4 years | Yes | Not printed |
Journey level plumber (JL)
8,000 hours and not less than four years of documented training, with 4,000 hours of commercial work under a certified journey level plumber; before testing, 16 hours of continuing education including at least 4 hours of industry-related electrical training. Then the certification exam. Source: WAC 296-400A-121, Plumber trainee experience and exam requirements.
Washington also issues narrower classes on the same page: Residential specialty plumber (6,000 hours and not less than three years) and Domestic pump specialty, unrestricted (4,000 hours, not less than two years) or limited volume (2,000 hours and one year).
Exam
1 of the 1 level listed here requires an exam: Journey level plumber. The source does not print a pass mark.
Fees
The Washington source read prints no dollar amounts for this license. The fee section (WAC 296-400A-045) was not read, so no amounts are shown.
Reciprocity
The Washington sources read for this trade name no reciprocity agreement and no route for out-of-state licensees.
How Washington compares
Among the 25 states on this site that state a minimum time to the top plumber credential, Washington ranks 14 of 25 from shortest (2 years) to longest (9 years). California, Florida, Illinois and Arizona set the same 4 years.
Same trade elsewhere: California · Texas · Florida · Illinois · Ohio. All states side by side: Plumber license requirements by state.
Other trades in Washington
- Electrician: Journey level electrician: 4 years of experience at minimum, plus an exam.
- General contractor: Washington uses a general contractor registration for general contractors, not a skills license.
All covered trades on one page: Washington trade licenses.
Background reading: From apprentice to master: how long each state takes · How trade license exams work.
Questions
Who issues the plumber license in Washington?
Washington State Department of Labor and Industries (L&I). Statewide plumber certificate of competency issued by L&I under chapter 18.106 RCW, with journey level and specialty certificates.
How long does it take to qualify for the Journey level plumber in Washington?
4 years by this site's count. 8,000 hours and not less than four years of documented training, with 4,000 hours of commercial work under a certified journey level plumber; before testing, 16 hours of continuing education including at least 4 hours of industry-related electrical training. Then the certification exam.
Does Washington have plumber license reciprocity?
The Washington sources read name no reciprocity agreement for this trade.
Sources and last checked
| What | Source | Checked |
|---|---|---|
| Issuing authority | Washington State Department of Labor and Industries (L&I) | 2026-10-21 |
| JL requirements | WAC 296-400A-121, Plumber trainee experience and exam requirements | 2026-10-21 |
| Law cited | Chapter 18.106 RCW; WAC 296-400A-121 | 2026-10-21 |
This page summarises what the Washington source said on 2026-10-21. It is general information, not legal advice; the board's own page and the statute are the authority and can change. Confirm with Washington State Department of Labor and Industries before applying. The free official route is the board itself: its page, application forms and staff answer eligibility questions.