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Before applying or renewing online...

... make sure you can meet all of the requirements

  • The fee is $151.90.
  • You must not have any outstanding, unpaid infractions with L&I.
  • If applying for a reciprocal license, please have your active out of state journey level certificate number on hand.Mail a copy of your active journey level card as well as your driver's license to the department.
  • If applying for an examination, verify that all of your hours are on file with the department. Mail any additional affidavits 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.
    • We accept Visa, MasterCard, Discover and American Express credit cards.

      Visa Card

      Mastercard

      Discover

      American Express

      Visa

      MasterCard

      Discover

      American Express

    • Note: We now accept E-Check, a one time withdrawal from your checking account.
What L&I will do:
  • Verify that the following information is on file with the department:
  • Affidavits of Experience.
  • Reciprocal Information.
  • For examinations, mail an examination notice.
  • For reciprocal, once approved, a notice will be mailed requesting an additional licensing fee.
Apply online now

 

  • If you pay by your expiration date, your renewal fee is $121.60.
  • If you are renewing after your expiration date and your renewal is not more than 90 days late, your renewal fee is $243.20.
  • If you pay by your expiration date for your Backflow Plumbers certificate the renewal fee is $83.90.
  • If you are renewing your Backflow Plumbers certificate after your expiration date and your renewal is not more than 90 days late, your renewal fee is $167.80.
  • If your renewal is more than 90 days late, you may not renew and must contact us about retaking your certification exam.
  • If your certificate is suspended for any reason, you may not renew online and you must contact us about reinstating it.
  • You must not have any outstanding, unpaid infractions with L&I or a collection agency.
  • 16 hours of continuing education is required for renewal of journey level or residential specialty plumber certificates. These 16 hours must consist of a minimum of 8 hours code and a minimum of 4 hours IRE and the other 4 hours may be from any category (code, IRE, IRP).
  • Renewal consists of paying the renewal fee and completing the required education. If not completed by your expiration date, late fees or retesting shall apply.
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.
  • We accept Visa, MasterCard, Discover and American Express credit cards.

    Visa Card

    Mastercard

    Discover

    American Express

    Visa

    MasterCard

    Discover

    American Express

  • Note: We now accept E-Check, a one-time withdrawal from your checking account.
Renew online now

 

You can also get or renew your plumber or reciprocal certificate

About becoming a plumber

You must have a valid plumber certificate to work in the plumbing construction trade in Washington State.

The plumbing construction trade includes but is not limited to all potable water building supply and distribution pipes, all plumbing fixtures and traps, all drainage and vent pipes, and all building drains including their respective joints and connections, devices, receptors, and appurtenances within the property lines of the premises and includes medical gas and medical vacuum systems , and water heaters: Provided, that no certification shall be required for the installation of a plumbing system within the property lines and outside a building.

What is required to become a journey level or specialty plumber?
To become a certified journey level or specialty plumber in Washington, while you are a Plumber Trainee you must do the following:

Expand/collapse all

Get the required amount of experience to qualify for a journey level or specialty plumber certificate.
  • Expand/collapse Journey level plumber (01) — qualified to work in all phases of plumbing construction.
    • 8,000 documented hours, and not less than 4 years, working as a plumber trainee under the supervision of a certified plumber.
      Note: 4,000 hours and not less than 2 years must be spent working in commercial or industrial installation.
      — OR —
    • Equivalent verified training or experience in the U.S. military.
      — OR —
    • A comparable license from another state may be submitted to the department for consideration.

    Specialty Plumber includes the following specialties:

  • Expand/collapse Residential (02) – limited to installation, maintenance, and repair of plumbing in single family dwellings, duplexes, and apartment buildings which do not exceed three stories.
    • 6,000 documented hours, and not less than 3 years, working in the specialty under supervision of a certified plumber.
      — OR —
    • Equivalent training or experience in the U.S. military with verification.
      — OR —
    • A comparable license from another state may be submitted to the department for consideration.
  • Expand/collapse Pump and irrigation (03) – limited to installation, maintenance, and repair of equipment that is used to acquire treat, store, or move water suitable for drinking or other domestic purposes, including irrigation or to a domestic water system
    • 4,000 documented hours, and not less than 2 years, working in the specialty under supervision of a certified plumber.
      — OR —
    • Equivalent training or experience in the U.S. military with verification.
      — OR —
    • A comparable license from another state may be submitted to the department for consideration.
    • Working in this trade also requires electrical certification. Steps to obtain a combination plumber/electrical certification.
  • Expand/collapse Domestic well (3A) – limited to installation, maintenance, and repair of equipment that is used to acquire, treat, store, or move water suitable for drinking or other domestic purposes on pumping systems not exceeding one hundred gallons per minute.
    • 2,000 documented hours, and not less than 1 year, working in the specialty under supervision of a certified plumber.
      — OR —
    • Equivalent training or experience in the U.S. military with verification.
      — OR —
    • A comparable license from another state may be submitted to the department for consideration.
    • Working in this trade also requires electrical certification. Steps to obtain a combination plumber/electrical certification.
  • Expand/collapse Backflow (30) – are limited to maintenance and repair of existing backflow prevention assemblies with a building. This does not include installing or replacing backflow prevention assemblies.
    • An active BAT (Backflow Assembly Tester Certification) issued by the Washington State Department of Health is required.

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