What are code revisions?

On-site Sewage/septic System (OSS) code revisions refer to the process of updating and modifying the standards and guidelines governing OSS. This includes design, installation, operation, and maintenance. Regular updates to these codes help maintain effectiveness, longevity and safety of the OSS.

​OSS code revisions aim to strike a balance between protecting public health and the environment while making room for the unique characteristics and challenges of different properties. Technical Advisory Committees, regulatory authorities, industry professionals, and community partners play essential roles in this process.

Code revisions fall into five different categories:

1. Certifications & Oversight - Protecting homeowners and communities by specifying level of service expectations for skilled, certified and trusted professionals to maintain healthy OSS systems.
2. Land Use & Development - Providing clarity and best practices for land use so that property development is aligned with wastewater treatment needs and healthy OSS systems support long term property use.
3. Design Specifications - Ensuring right-sized solutions for all OSS systems by authorizing the best designs with proven healthy outcomes.
4. Repairs & Remodeling - Protecting homeowners and communities by ensuring that the permitting process for repairs & remodels is simple and does not undermine healthy OSS systems.
5. Operation & Maintenance - Establishing evidence-based timelines for regular maintenance & inspections and setting no-nonsense operational standards that help homeowners and providers work together to maintain healthy OSS management.
   

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King County draft code revision language

Over the last several months, King County staff have heard from over a thousand people via meetings, interviews and surveys. This input has helped them draft code revision language that is nearly ready. Over the next month the County will be asking for public comment on this language. Please visit http://www.kingcounty.gov/oss/code.

Washington State Codes

The Washington State Board of Health recently approved revisions to the statewide OSS rules. King County is now updating our local codes to make sure they comply with state changes.

WAC Codes

Code Revision Goals

• Protecting Public Health: Ensuring that OSS effectively treat and dispose of wastewater to prevent the spread of waterborne diseases and protect public health.
• Environmental Preservation: Minimizing the impact of OSS on local ecosystems, groundwater, and surface water quality to maintain environmental sustainability.
• Adaptation to Technological Advances: Integrating new technologies and innovations that enhance the efficiency, reliability, and environmental performance of on-site sewage systems.
• Community Engagement: Involving community members in the decision-making process to address local concerns, promote transparency, and ensure that regulations align with community needs.
• Compliance and Enforcement: Establishing clear and enforceable standards to ensure that on-site sewage systems are designed, installed, and maintained in accordance with regulatory requirements.​

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