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Have a technical septic question?

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Septic repair permit

  • Contact a certified master installer in King County.
  • Master installer submits a repair proposal to Public Health – Seattle & King County.
  • If approved by Public Health – Seattle & King County, an application for permit is submitted by the master installer. If disapproved, a new or modified proposal must be submitted, possibly by a licensed designer.
  • After permit is issued by Public Health – Seattle & King County, repair is completed by master installer.
  • Repair is inspected by Public Health – Seattle & King County.
  • As-built of repair is submitted to Public Health – Seattle & King County by the master installer.
  • As-built of replacement septic system submitted by the designer or qualified professional engineer.

Septic replacement permit

  • Depending on size of replacement, contact a certified designer, master installer or qualified professional engineer.
  • Your septic system professional submits a design proposal, called a 'site application', to Public Health – Seattle & King County.
  • If approved by Public Health – Seattle & King County, an application for permit is submitted by your septic system professional. If disapproved, a new or modified proposal must be submitted.
  • The designer or qualified professional engineer conducts a pre-installation (also known as, stub-out) inspection and gives report to the master installer and Public Health – Seattle & King County.
  • After permit is issued by Public Health – Seattle & King County, the installation is completed by master installer.
  • Installation is inspected by the designer.
  • Installation is inspected by Public Health – Seattle & King County.

Building permit

  • You may apply for this review prior to or at the same time as the Building Department's review of your application. Please consult with your building official.
  • While preparing your application, it is important to accurately describe the location of all septic system components on your site plan. Search and download a drawing of your septic system (as-built drawing).
  • The application must be filled out with 3 complete packages.
  • Each application is reviewed by an inspector and receives a site visit. Examples the inspector are looking for includes:

    • Age of septic system
    • Condition of system
    • Type of system
    • Location of system as compared to area of remodel
    • Presence of a reserve drainfield area
    • Size of remodel
      • existing square footage vs. square footage being added
    • Type of addition(s)/remodel
      • are bedrooms being added?
    • Water source
      • a drinking water well requires certain setbacks to structures
      • structures must be served by an approved water source
    • Record drawing and past permit history
  • Due to the scope of your remodel and condition, location and age of your septic system, you may be required to have the septic system evaluated by a licensed septic professional or in some cases a new on-site sewage/septic system meeting all current regulations may be required. The inspector will notify you in writing what this evaluation must include and what type of septic professional must be contacted.
  • You may also be required to upgrade or replace your septic system.

Limited repair permit

  • Under certain circumstances, you may have to contact a certified master installer or on-site system maintainer in King County. If you have a conventional gravity septic system, the repair may be completed before obtaining a permit. If you have any questions about when to apply for a repair permit, please call our office at 206-477-8050.
  • Master installer or on-site system maintainer submits repair proposal for limited repair to Public Health – Seattle & King County.
  • Repair is completed by the master installer or on-site system maintainer.
  • Record of repair is submitted to Public Health – Seattle & King County by the master installer or on-site system maintainer.
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