Current Turnaround Times
- New Septic System Application: 5 Weeks *We are not accepting expedited septic applications at this time*
- Building Construction Clearance Review: 4 Weeks
Designing and building an on-site sewage system (OSS) on your property can be a lengthy process. State and local rules and regulations require that you first hire a licensed professional who will evaluate your site, design a system, and complete the permit application process with our office.
The Snohomish County Health Department reviews septic system designs for single-family homes and small businesses (systems less than 3,500 gallons per day). The Washington Department of Health regulates larger septic systems in Snohomish County.