On-Site Inspector

On-Site Inspector Certificate of Competency

All applicants are required to take the On-Site Wastewater Treatment Systems Designers exam. To be considered for approval you must submit a complete application to the board office.

If you have a certificate of competency, you may perform on-site design services for local health jurisdictions, but may not practice as a licensed on-site designer.

Application Requirements

  • Employment at a local health jurisdiction
  • One year of practical work experience under the direct supervision of a certificate of competency holder, licensed designer or Professional Engineer.
  • A written request for certification from your Local Health Director or designee
  • A passing score on the On-Site Designer/Inspector Law Review
  • A passing score on the written On-Site Designer License Exam

Required Documentation

  1. Complete the On-Site Wastewater Treatment System Inspector Certificate of Competency Application 
  2. Pay your fee (see form directions)
  3. Complete On-Site Wastewater Treatment Systems Inspector Certificate of Competency Experience Verification form
  4. Have the director/director designee of the Health Department/Jurisdiction sign the DOH request for Examination form and submit it with your application
  5. Pass the Washington On-Site Wastewater Designer/Inspector Law Review Exam

How to Apply

Apply Online

  • Login or Sign-up to apply and pay your application fee.
  • Access our service Board of Registration for Professional Engineers & Land Surveyors (BRPELS).

Apply by Mail

  • Mail documents with a check or money order to:

Board of Registration for Professional Engineers and Land Surveyors
PO Box 3777
Seattle, WA 98124-3777