Every Washington county has unique septic inspection requirements. Select your county to see local rules and contact information.
Washington State is implementing new rules that will require septic inspections for all property transfers statewide, starting February 1, 2027 (WAC 246-272A-0270). This rule is already in effect in some counties — use this tool to check your area.
If you're buying or selling property in Washington, it's never too early to understand your local requirements and get a head start on inspections.