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