When is an OSS permit needed?

You need an OSS permit (septic system permit) any time you construct, repair, replace, modify, connect to, or expand your septic system. You do not need an OSS permit when you:

  • Replace a baffle in a septic tank.
  • Fix a broken house sewer pipe.
  • Replace a pump control float.
  • Fix or replace septic risers, lids or inspection ports.
  • Replace a septic pump.

Your OSS permit does not mean that you have met any other legal requirements like building codes or zoning ordinances. You must also comply with relevant permit requirements from other agencies before you begin work on your system. For example, you may need to get a land disturbance permit from Whatcom County Planning and Development Services

On-Site Sewage

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1. Can I use my septic system during or after a flood?
2. How do I know if my septic system was damaged by flooding, and how can I get it fixed?
3. Should I use an additive in my septic tank?
4. When is an OSS permit needed?
5. Can I design my own OSS?
6. Can I install my own OSS after I obtain an OSS permit?
7. Do you have a copy of my OSS permit?
8. How do I clean up sewage that has backed up into my house?
9. What are some signs that my OSS is failing?
10. How can I find my septic tank?
11. What is the reserve area?