Septic Permitting

Snohomish County Health Department is here to make sure septic systems are designed and installed properly to protect public health and water quality in our region, ensuring they meet current Washington State regulations and Snohomish County Board of Health Code for on-site wastewater treatment. We provide professionals and residents in the county with various septic permit services, including:

• Review of all septic system design applications and installations for residential properties and small businesses (systems with design flows of less than 3,500 gallons per day). 
• Review of construction clearances for properties with septic systems
• Review of applications for individual water supplies
• Certification and licensing of septic installers, pumpers, and monitoring and maintenance specialists within Snohomish County
• Complaint investigations and enforcement
• Technical assistance to the public

Click the buttons above to learn more about septic permitting. If you have any questions, see our Frequently Asked Questions or contact the Health Department's Environmental Health division by emailing SHD-EHQ@snoco.org or calling (425) 339-5250.

Note: Washington State Department of Health enforces regulations for any systems with design flows of 3,500 gallons or more per day. See their page on Large On-Site Sewage Systems (LOSS) for more information.