how to become a plumber in washington (2026)
Becoming a licensed plumber in Washington takes 4–5 years (apprenticeship) + trade school. You'll go through trade school or an apprenticeship, accumulate on-the-job hours, and pass the Washington State Dept of Labor and Industries exam. Here's exactly what to expect — and how to do it as fast as possible.
step 1: choose your training path
There are two main routes to becoming a licensed plumber in Washington:
| path | timeline | cost | best for |
|---|---|---|---|
| Union Apprenticeship | 4–5 years (apprenticeship) + trade school | Low to free (paid while learning) | Maximum wages, full benefits, union card |
| Trade School + OJT | 4–5 years (apprenticeship) + trade school | $5,000–$20,000 tuition | Faster classroom phase, more flexible |
| Vo-Tech / Community College | 4–5 years (apprenticeship) + trade school | $3,000–$12,000 | Lower cost, stackable credentials |
Training sources in Washington: UA (Plumbers & Steamfitters) apprenticeships, PHCC programs. These are the primary pathways that lead to the Washington State Dept of Labor and Industries exam.
step 2: complete your apprenticeship hours
Regardless of which training path you choose, Washington requires documented on-the-job experience hours before you can sit for the journeyman exam. You'll work under a licensed journeyman or master plumber, learning hands-on skills including:
- Pipe fitting
- water systems
- drainage
- gas lines
- code
step 3: pass the Washington State Dept of Labor and Industries exam
The licensing exam tests your knowledge of trade theory, state-specific code, safety regulations, and practical applications. The exam is administered by the Washington State Dept of Labor and Industries. Key things to know:
Exam prep tip: Most candidates who fail on the first attempt do so because they underestimate the code section. Focus on the applicable code book ({"electrician":"NEC (National Electrical Code)","plumber":"UPC or IPC (plumbing codes)","hvac":"ASHRAE standards, EPA 608","welder":"AWS welding codes","carpenter":"IBC, local building codes"}.get(trade_slug, "trade code")) and practice calculations, not just definitions.
step 4: work as a journeyman, advance to master
Once you pass the journeyman exam, you can work independently on permitted jobs in Washington. The next milestone is the master plumber license, which typically requires 2+ additional years of journeyman experience. With a master license, you can:
- Pull permits independently
- Run your own crew or business
- Bid on commercial and government contracts
- Command salaries of $99,562–$121,687 per year
salary outlook in washington
Washington has no state income tax and some of the highest trade wages in the US. The tech boom and Boeing keep demand extremely high. Plumbers here earn a median of $73,750 per year. Entry-level work starts around $54,575, and master-licensed tradespeople and contractors can reach $114,312 or more.
Demand drivers: water infrastructure, residential boom, commercial construction. BLS projects 9% job growth nationally through 2032, and Washington tracks at or above that rate.
where the work is in washington
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How do I become a plumber in Washington?
Complete trade school or a union apprenticeship (UA (Plumbers & Steamfitters) apprenticeships, PHCC programs), accumulate the required on-the-job hours, then pass the Washington State Dept of Labor and Industries licensing exam. The full process takes 4–5 years (apprenticeship) + trade school.
How long does it take to become a plumber in Washington?
Typically 4–5 years (apprenticeship) + trade school — this includes the classroom/theory phase plus the apprenticeship hours required to sit for the journeyman exam.
How much do plumbers make in Washington?
Plumbers in Washington earn a median of $73,750 per year. Entry-level: $54,575. Experienced journeyman: $84,812–$99,562. Master license: $99,562+.
Is becoming a plumber worth it in Washington?
Yes. Washington's plumber market is strong — washington has no state income tax and some of the highest trade wages in the us. the tech boom and boeing keep demand extremely high. Hardhat's AI survival score for plumbers is 76/100. This work is difficult to automate and in high demand.