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:
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.
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Whatcom County code requires that all OSS be installed by a licensed OSS installer; however, if you are the property owner and you will live in the home the OSS will serve, you can request an exemption from certification requirements. The request will be reviewed and if approved, you can install the OSS. We recommend that you hire a Licensed OSS Installer for complex systems, e.g. pressure systems or alternative systems.
Developers must hire a Licensed OSS Installer or obtain an OSS Installer's License through the Health Department to install OSS on properties they plan to develop and then sell.