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Washington Domestic Well (3A) Contractor License

The Domestic Well (3A) Contractor License allows you to do the following work:

  • Pressurization
  • Filtration
  • Treatment
  • Circuit extensions and controls of only 7.5 horsepower or less
  • 250 volt domestic water and residential wastewater pumps
  • Extension of branch circuits to:
    • Signaling circuits
    • Motor control circuits
    • Motor control devices
    • Pumps

How to Get the Domestic Well (3A) Contractor’s License in Washington?

    1. Be an electrical trainee or have equivalent out-of-state or military experience
    2. Meet the experience and training requirements (You can use the Washington Department of Labor & Industries' tool to verify the hours of experience):
      • Domestic Well (3A):
        • 2,000 hours of work experience related to the selected specialty as an electrical trainee
        • 24 hours of basic classroom instruction
        • Be supervised 75% of the time
    3. Fill out the corresponding application form for the electrical examination:
    4. Mail the application and the documents needed to certify the experience required for each license to:
      Electrical Licensing and Certification
      PO Box 44460
      Olympia WA 98504-4460
    5. Register with PSI© and schedule the examination once the application has been reviewed by the Washington State Department of Labor & Industries. For more information on the test, refer to PSI©’s Electrical Certification Candidate Information Bulletin

Washington Domestic Well (3A) Contractor License Exam Prep Courses

Washington Domestic Well (3A) Contractor License Exams

Below is all the information related to the trade and WA Codes exams, including the official reference lists.

Washington Domestic Well (3A) Contractor Trade Exam

  • Testing Method: Computer-based testing
  • Testing Company: PSI©
  • Number of Questions: 20
  • Types of Questions: Multiple choice
  • Time Allowed: 60 Minutes
  • Minimum Passing Score: 70%
  • Subjects Involved (No. of Questions):
    • NEC 100-110 - General Requirements (1)
    • NEC 200-225, 280-285 - Wiring & Protection (2)
    • NEC 240 - Overcurrent Protection (2)
    • NEC 250 - Grounding & Bonding (2)
    • NEC 300-398 - Wiring Methods (3)
    • NEC 400-427, 455-480 - Electrical Equipment (1)
    • NEC 430-450 - Motors, HVAC, Generators & Transformers (3)
    • NEC 500-516 - Hazardous Locations (1)
    • NEC 705-780 - Special Conditions (1)
    • General Trade Knowledge & Theory (4)
  • PSI© Domestic Well (3A) Official Content Outline

Washington Domestic Well (3A) Contractor WA Codes Exam

  • Testing Method: Computer-based testing
  • Testing Company: PSI©
  • Number of Questions: 17
  • Types of Questions: Multiple choice
  • Time Allowed: 60 Minutes
  • Minimum Passing Score: 70%
  • Subjects Involved (No. of Questions):
    • Washington Laws & Rules (RCW & WAC) (17)
  • PSI© WA Codes Official Content Outline

Washington Domestic Well (3A) Contractor Book Set

This set of books includes all required references for the Domestic Well (3A) and WA Codes exams. Orders placed before 2 PM are shipped the same day via UPS and a tracking number is emailed before 3 PM.

  • WASHINGTON DOMESTIC WELL (3A) - BOOK SET WITHOUT TABS INCLUDES ALL BOOKS FOR TRADE AND BUSINESS EXAMS

    Sales price: $349.45

  • WASHINGTON DOMESTIC WELL (3A) - BOOK SET WITH TABS INCLUDES ALL BOOKS FOR TRADE AND BUSINESS EXAMS

    Sales price: $399.45

Washington Domestic Well (3A) Contractor Exam Books

Books Allowed in Testing

Washington Domestic Well (3A) WA Codes Exam Books

Books Allowed in Testing

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