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The City of Portland, Oregon

Development Services

From Concept to Construction

Phone: 503-823-7300


1900 SW 4th Ave, Portland, OR 97201

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Land Use/On-Site Sewage Disposal System Certification

A commercial/residential on-site sewage disposal system certification is a program of Multnomah County managed by the City of Portland’s Bureau of Development Services. It is required for approval of any land use involving a new or expanded use of land or the creation of a new parcel. The Environmental Soils section of the Bureau of Development Services reviews the sewage disposal system before Multnomah County will accept any land use proposals.

The following items are to be submitted along with both an on-site sewage disposal system application and a septic permit application:

  • A small section map or title insurance map for property identification
  • Scaled, legible site plan showing all existing and proposed structures, existing septic system and private well (if applicable)
  • Detailed floor plan
  • If the property has a land feasibility study, please include a copy with the application and materials

When filling out the application, make sure to mark “certification of on-site sewage disposal without site visit.”

Bring the completed applications, related materials and fees to the Development Services Center for processing.

Once the application and materials are reviewed, Environmental Soils staff will notify you if a site visit or an authorization notice is required.

Upon approval, the original certification form and materials will be mailed to the applicant to be submitted to the Multnomah County Land Use & Transportation Program located at 1600 SE 190th Avenue, Portland, OR.

Please call the Environmental Soils staff at (503) 823-6892 or Multnomah County Land Use & Transportation Program at (503) 988-3043 with any questions.