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Environmental Health Division

Phone:(425) 339-5250
Email: wwwquestions@shd.snohomish.wa.gov
Office Hours: Monday through Friday 8:00 am to 5:00 pm

Rules and Regulations

The following documents contain all guidelines used to regulate on-site septic system design and installation in Snohomish County. If you have any questions regarding the content or application of information in these documents, please contact the wastewater program staff.

Washington Administrative Code, Chapter 246-272A, Onsite Sewage Systems
Snohomish Health District Sanitary Code, Chapter 8
The Sanitary Code is governed by the Snohomish Health District Board of Health.
Recommended Standards and Guidance Documents about On-site Treatment Systems (RS&G's)
The RS&G's are provided by the Washington State Department of Health.
Policies
Policy Regarding Trench Separation
Policy Regarding Reduced Size Soil Absorption Systems
Policy Regarding Non-pressurized Storage Tanks for Individual Water Supplies
Policy Regarding Watertight Tank Standards
Policy Regarding Interpretation of Bedroom and Daily Flow Determination
Policy Regarding Aerobic Treatment Units and Disinfection Methods
Policy Regarding Operation and Maintenance: Alternative Systems Meeting Treatment Standards 1 and/or 2

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Last Reviewed and updated July 26, 2007