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Environmental Health

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On-Site Sewage Systems

On-Site Sewage System (OSS) Program

The On-site Sewage System Program has regulatory oversight for all on-site sewage systems in Whatcom County. We perform a wide variety of activities to carry out this oversight that include:

  • Site Application review for new, repaired or expanded OSS
  • Permit Issuance
  • Final Construction inspections
  • Subdivision, Boundary Line Adjustment and Conditional Use review
  • Complaint investigations
  • Enforcement of OSS Codes, e.g. Whatcom County Code, WCC 24.05 and Washington Administrative Code, WAC 246-272A
  • Survey inspections of OSS in sensitive areas
  • Homeowner education and notification regarding proper Operation and Maintenance of their OSS
  • Certification program for OSS Pumpers, Installers and Operation and Maintenance Specialists

Click on the following for more information about the OSS Program:

OSS Documents Online

OSS Program Forms

Frequently Asked Questions

OSS Operation & Maintenance Requirement

Homeowner Inspection Certification Training

OSS Annual Fee

OSS Permit Process

OSS Loan Program

OSS Rules & Regulations

Licensed Designers

Licensed Installers

How to Obtain an Installer's License

Installer Licensing Study Guide

Licensed Operation & Maintenance (O&M) Specialists

How to Obtain an O&M Specialist License

Licensed Pumpers

How to Obtain a Pumpers' License

Pumpers' License Study Guide

Cleaning up after a Sewage Spill

Seven Ways to Save Thousands of Dollars in Septic System Repairs Brochure