How to Become a Plumber in WA State – Step-by-Step Guide (2025)

Dreaming of a stable, hands-on career with strong earning potential? You’re not alone. Many people in Washington State are turning to skilled trades like plumbing to build rewarding careers without the burden of student debt. If you’ve searched “how to become a plumber in WA State,” you’re in the right place. This guide walks you through every step—from training to licensing—with up-to-date, actionable advice that aligns with Washington’s official requirements.

What Does It Take to Become a Plumber in Washington State?

Plumbing in Washington isn’t just about fixing leaky faucets. Licensed plumbers design, install, and maintain complex water, gas, and drainage systems in homes and businesses. To legally work as a plumber in WA, you must be licensed by the Washington State Department of Labor & Industries (L&I).

According to the U.S. Bureau of Labor Statistics (2024), plumbers in Washington earn a median annual wage of $68,320—well above the national average—thanks to high demand and strict licensing standards that ensure quality work.

Step 1: Meet Basic Eligibility Requirements

Before you enroll in any program, ensure you qualify:

• Be at least 16 years old (to start training)
• Have a high school diploma or GED
• Be legally authorized to work in the U.S.

While you don’t need college, strong math, mechanical aptitude, and problem-solving skills are essential. Consider taking shop or drafting classes if you’re still in school.

Step 2: Complete a State-Approved Plumbing Apprenticeship

Washington requires 8,000 hours (about 4–5 years) of supervised on-the-job training through a state-registered apprenticeship program.

Where to Apply:

• Plumbing-Heating-Cooling Contractors Association (PHCC) of Washington
• UA Local 32 Plumbers & Steamfitters (Seattle-based)
• Associated Builders and Contractors (ABC) – Pacific NW Chapter

These programs combine paid work (starting at ~$20–$25/hour) with classroom instruction (at least 576 hours total). You’ll learn:

• Pipefitting & blueprint reading
• Washington plumbing code (based on the Uniform Plumbing Code)
• Backflow prevention
• Safety protocols (OSHA 10 certification often included)

💡 Pro Tip: Apprenticeships are competitive. Submit strong references, a clean driving record, and show genuine interest in the trade.

Step 3: Register as a Plumber Trainee

Before starting your apprenticeship, you must register with L&I as a Plumber Trainee:

1. Create an account on Lni.wa.gov
2. Pay a $25 fee
3. Provide proof of employment with a licensed plumbing contractor

This registration lets you work under direct supervision while earning toward your license. You cannot perform plumbing work independently without this status.

Step 4: Pass the Washington Plumber Certification Exams

After completing your 8,000 hours, you’re eligible to take two exams:

Both are administered by PSI Services at testing centers in Seattle, Spokane, Tacoma, and Yakima. Study using the Washington Administrative Code (WAC) Title 296, Chapter 400 and the Uniform Plumbing Code (UPC).

📚 Study Resource: The Uniform Plumbing Code Wikipedia page gives a helpful overview of the national standard Washington adopts (with state amendments).

Step 5: Apply for Your Journey-Level Plumber License

Once you pass both exams:

1. Submit your license application online via L&I
2. Pay the $132 licensing fee
3. Provide proof of completed apprenticeship

Your license is valid for two years and must be renewed with 16 hours of continuing education (including 2 hours on Washington law).

How Long Does It Take to Become a Plumber in WA?

Total: ~4.5 to 5.5 years from start to licensed journeyman.

Salary & Career Outlook for Plumbers in Washington

Washington’s construction boom and aging infrastructure create strong demand:

• Job Growth (2022–2032): +14% (faster than average) – WA Employment Security Dept
• Top-Paying Metro Areas: Seattle-Tacoma-Bellevue ($74,600 avg)
• Self-Employed Plumbers: Can earn $90,000+ annually with strong client networks

Plus, experienced plumbers can advance to:

• Residential or Commercial Specialty Licenses
• Master Plumber License (requires 2+ years as journeyman + additional exam)
• Plumbing Contractor Business Owner

Pros and Cons of a Plumbing Career in WA

Frequently Asked Questions (FAQ)

Q: Can I become a plumber in WA without an apprenticeship?
A: No. Washington requires 8,000 hours of supervised training through a state-registered apprenticeship. There are no shortcuts or exam-only paths.

Q: How much does plumbing school cost in Washington?
A: Most apprenticeships are tuition-free—you earn while you learn. However, you may pay for tools ($300–$600), work boots, and exam fees (~$250 total).

Q: Do I need a contractor’s license to work as a plumber?
A: Not initially. As a journey-level plumber, you can work for a licensed plumbing contractor. But if you want to start your own business, you’ll need a Plumbing Contractor License from L&I.

Q: Can out-of-state plumbers get licensed in WA?
A: Yes, through reciprocity with Oregon, Idaho, and California—if you’ve held an equivalent license for 2+ years. You’ll still need to pass WA’s law & code exam.

Q: Are there plumbing scholarships or grants in Washington?
A: Yes! Check with SkillSource, WorkSource WA, and unions like UA Local 32. Some offer tool stipends or transportation aid for apprentices.

Q: What’s the difference between a trainee, journeyman, and master plumber in WA?

• Trainee: Learner under direct supervision
• Journeyman: Fully licensed, can work independently on most jobs
• Master: Qualified to design systems, pull permits, and supervise others

Final Thoughts

Becoming a plumber in WA State is a smart career move—offering stability, income growth, and the satisfaction of essential work. With clear steps, strong support systems, and rising demand, now is an excellent time to start your journey.

👉 Ready to apply? Visit the WA L&I Plumbing Licensing Page to begin your trainee registration.

Found this guide helpful? Share it with a friend or on social media to help others launch their plumbing career in Washington! 🛠️💧