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Before applying or renewing online ...
...make sure you can meet all of the requirements
- Requirements for
applying for a plumber trainee or backflow trainee certificate
- The fee is $39.70.
- You must pay by credit card (VISA/MC). No debit cards.
- You must not have any outstanding, unpaid infractions with L&I.
- If you have affidavits of experience
to submit, mail them to:
Department of Labor & Industries
Plumber Certification Section
PO Box 44470
Olympia, WA 98504-4470
Before you apply online, you will need the following:
- Your Social Security number.
- Your credit card handy.
What L&I will do:
- Verify the hours on the affidavit.
- Mail your certificate within 2-4 weeks of receipt of your affidavits.
Apply online now
- Requirements
for renewing a plumber trainee certificate
- The renewal fee is $39.70.
- You must pay by credit card (VISA/MC only).
- You must not have any outstanding, unpaid infractions with L&I or a collection agency.
- If your certificate is suspended for any reason, you may not renew online and you must contact us about reinstating it.
- If you have affidavits of experience, you must mail them to Department of Labor & Industries, Plumber Certification Section, PO Box 44470, Olympia, WA 98504-4470.
- 8 hours of approved continuing education each year is required for plumber trainee renewal.
Before you proceed to renew online, you will need the following:
- Your 12-digit license number.
- An active license (not suspended or canceled).
- Required documents on file with the department.
- Your credit card handy.
Renew online now
You can also get or renew your plumber trainee or backflow trainee certificate
- By mail: Print the Plumber Certification Application (281 KB PDF) and follow the directions.
- In person: at any L&I field office.
