Washington Backflow (PL30) Contractor License

The Backflow (PL30) Contractor License allows you to maintain and repair existing backflow prevention assemblies.

The Washington Backflow (PL30) Contractor License may not install new backflow prevention assemblies or replace any of its parts

How to Get the Backflow (PL30) Contractor’s License in Washington?

1. Have experience as a Plumber Trainee. If you don’t have experience as a Plumber Trainee, meet the following requirements and apply for a Plumbing Trainee certificate:
   • Be at least 16 years of age
   • Work under the supervision of a journey level or certified plumber
   • Take 8 hours of plumbing code and 4 hours of electrical classes in two years
2. Fill out anAffidavit of Experience to report the supervised work hours as a plumber trainee
3. Meet the required experience or education:
   • Backflow (PL30): Have an active Backflow Assembly Tester Certification issued by the Washington State Department of Health
4. Fill out and notarize an Application for Contractor License
5. Complete and obtain a Surety Bond or Assigned Savings Account
6. Get a Certificate of Liability Insurance
7. Choose a designated plumber to hold the valid plumber certificate. The designated plumber can be another person or the applicant, depending on whether they are applying as a business or as a sole proprietor
8. Satisfy the following educational requirements and apply for the plumber examination with PSI©:
   • The Backflow (PL30) plumbers have no educational requirements; only a copy of an active Backflow Assembly Tester card is needed
9. Refer to the PSI© Plumbing Examinations Candidate Information Bulletin, for more information on the test (locations, subjects, books to prepare for the exam)
10. Submit a completed package with all the required documents to:
    Washington State Department of Labor & Industries
    Plumber Certification
    PO Box 44470
    Olympia WA 98504-4470

Washington Backflow (PL30) Contractor License Exam Prep Course

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Washington Backflow (PL30) Contractor License Exam

Below is all the information related to the trade exam, including the official reference list.

Washington Backflow (PL30) Contractor Trade Exam

• Testing Method: Computer-based testing
• Testing Company: PSI©
• Number of Questions: 55
• Types of Questions: Multiple choice
• Time Allowed: 90 Minutes
• Minimum Passing Score: 70%
• Subjects Involved:
  • Medical Gas
  • Gas and Vacuum Systems
  • Pump Specialty
  • Existing Backflow Prevention Assemblies
    • Repair
    • Maintenance
• PSI© Backflow (PL30) Official Content Outline

Candidates must apply for eligibility with the Department before being allowed to take the examination. Please note that this is a closed-book examination.

Washington Backflow (PL30) Contractor Book Set

This set of books includes all required references for the Backflow (PL30) exam. Orders placed before 2 PM are shipped the same day via UPS and a tracking number is emailed before 3 PM.

Washington Backflow (PL30) Contractor Exam Books

Books Not Allowed in Testing

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