Washington Journey Level Plumber Exam Prep

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Official sitting

Washington Journey Level Plumber exam at a glance

The Washington Journey Level Plumber exam has 100 questions and a time limit of 1 hour 30 minutes, and it is closed book. That works out to about 0.9 minutes per question. The passing score is 70%. Figures are from the official candidate bulletin, checked September 19, 2026.

Questions100
Time1 hour 30 minutes
Passing score70%
BookClosed book

Confirm question count, time, open-book rules, and passing score on the live board bulletin before you sit. We do not guarantee a passing result. Source: PSI WA Plumbing CIB 7/30/2026; lni.wa.gov/licensing-permits/plumbing/plumber-examination; test-takers.psiexams.com/waplumb, checked September 19, 2026. How we source exam facts

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What’s included

19,000+ word study guide

Worked calculations, code-section breakdowns, exam traps, a key-terms glossary and a 30/60/90-day plan.

4 full-length practice exams

Original questions weighted to match the topic mix of the real exam.

400 practice questions

Every one with a written explanation and the code section behind the answer.

Same study guide and four exams on every term. You are choosing how long you can log in.

Instant accessSecure checkoutBuilt on current codes
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What this prep covers

  1. About the Washington Journey Plumber license
  2. How Washington licensing works
  3. Plumbing math and fundamentals
  4. How the plumbing code is organized
  5. Sanitary drainage, waste, and vent (DWV)
  6. Venting
  7. Water supply and distribution
  8. Fixtures, traps, and interceptors
  9. Water heaters, relief, and gas
  10. Backflow prevention and cross-connection control
  11. Fixtures required by occupancy, clearances, and accessibility
  12. Materials, joining, and storm drainage
  13. Inspection, testing, and isometrics
  14. Worked calculations
  15. Sample exam questions, solved
  16. Common mistakes and exam traps
  17. Key chapters and tables to know cold
  18. Glossary of must-know terms
  19. Your 30 / 60 / 90 day study plan
  20. Exam-day strategy

Washington Journey Level Plumber licensing, explained

About the Washington Journey Plumber license

Washington certifies plumbers through the Washington State Department of Labor & Industries (L&I). The Journey Level Plumber (PL01) certification is the top individual plumbing credential in the state — it qualifies you to work on all phases of residential, commercial, and industrial plumbing without limitation (Washington does not have a separate "master plumber" certification above it). You earn it by working as a registered plumber trainee under a certified journey level plumber and passing the trade exam. A business that wants to pull its own permits registers separately with L&I as a plumbing contractor — that is a business registration, not an individual license.

Your exam is built on the 2015 Uniform Plumbing Code with the Washington amendments, which is the book L&I names on the plumber-examination page. The field installations you will make after you hold the card follow the 2021 UPC as adopted in WAC 51-56, effective March 15, 2024. The International Plumbing Code uses different fixture-unit values, a different slope rule, and different section numbers. A number that is right in the IPC can be the wrong answer here.

Know these scope facts cold: the license is held by the individual; most work requires a permit and inspection (rough-in/top-out and final); you must work within the classification you hold; and unlicensed or out-of-scope plumbing work is a violation that can cost you the license and carry penalties. Plumbing protects public health — the exam constantly returns to the two core purposes of the code: deliver safe potable water and remove waste without contaminating that water.

How Washington licensing works

  • Experience: 4 years or more (at least 8,000 hours) working as a registered plumber trainee under a certified journey level plumber, with at least 2 years (4,000 hours) of that time in commercial or industrial installations.
  • Education before the exam: WAC 296-400A-121(6) requires 16 hours of continuing education, including at least 4 hours of industry-related electrical training, before you test for journey level, domestic pump, or residential specialty. Renewal is a separate clock: 24 hours in the three-year certificate period (WAC 296-400A-028), at least 12 hours of plumbing code and 4 hours of electrical, with the other 8 hours in plumbing or electrical trade classes.
  • Application: submit the exam application and fee, with your trainee experience affidavits on file with L&I, before you're approved to test.
  • Exam vendor: PSI. The exam is closed book and given in three timed parts — a roughly 100-question technical/code-knowledge section, plus two code-application sizing exercises (one on waste-and-vent sizing, one on water-piping sizing). A handful of sizing tables are supplied with the exam; everything else is from memory. The passing score is 70 percent on each portion. The July 30, 2026 bulletin prints the counts and the times: 100 questions in 90 minutes, then two drawing portions of 25 items in 90 minutes each. Tables 702.1, 610.3, 610.4, and 610.10 are in the room. Table 703.2 is not.
  • Renewal: certification renews roughly every 3 years, on your birthdate, and requires 24 hours of continuing education before you renew — at least 12 hours of plumbing code and at least 4 hours of industry-related electrical (IRE), with the remaining hours in any approved category.

This is the opening of the full study guide. The complete guide continues into code navigation, worked calculations and solved exam questions.

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Common questions about this exam

How many questions are on the Washington Journey Level Plumber exam?

The Washington Journey Level Plumber exam has 100 questions and a time limit of 1 hour 30 minutes, about 0.9 minutes per question. It is closed book. The passing score is 70%. Check the current board bulletin before you book.

How much practice does this prep include?

It includes 4 full-length practice exams and 400 practice questions in total. Every question has a written explanation naming the code section the answer comes from.

How long is the study guide?

The Washington Journey Level Plumber guide runs to roughly 19,519 words in 20 sections, starting with “About the Washington Journey Plumber license” and ending with “Exam-day strategy”.

How long do I get access?

Choose 30, 60 or 90 days at checkout. Your days do not start at checkout: they begin the first time you open the course (or 14 days after purchase, whichever comes first). Access works on any device, and you can retake every practice exam as often as you like. Days remaining are shown in your dashboard and you can extend at any time.

Is this an official Washington Journey Level Plumber exam?

No. This is independent preparation material. It is not affiliated with or endorsed by any state licensing board or exam vendor, and it does not contain real exam questions. Always confirm current requirements with your licensing board.

About this prep

This prep is built specifically for the Washington Journey Level Plumber examination and includes a 19,000+-word study guide written for this exam, 4 full-length practice exams and 400 practice questions, each with a written explanation.

How access works

You are paying for access length (30, 60, or 90 days). The study guide and four timed exams are the same on every term. Your days start the first time you open the course, not at checkout (or 14 days after purchase, whichever comes first), and access works on any device for that term.

Not affiliated with or endorsed by any state licensing board or exam vendor. For exam-preparation purposes only.