Buying or selling a property with an on-site sewage/septic system
King County properties with a septic system must have their system inspected by a certified on-site system maintainer before the transfer of title.
Schedule an inspection
Sellers will need to schedule the inspection with a certified on-site system maintainer.
Find an on-site system maintainer in King County
Waiving the inspection
An inspection can be waived if one of the following apply:
- An Operation/Performance Monitoring Report has been performed by a licensed on-site system maintainer within the last 6 months. Reports for this on-site sewage system have been filed with Public Health - Seattle & King County on a regular basis.
- The property is new construction, and the home has never been occupied. This requires proof of vacancy.
- A permitted on-site sewage system is installed, and the first inspection is not yet due. You have 45 days use for proprietary systems, and 6 months use for gravity and public domain technology systems.
- The on-site sewage system has been abandoned due to residence connecting to public sewer, or land converting to public use.
Download a waiver form for property transfer inspection (49 KB)
Property transfer inspection reports
- After your certified on-site system maintainer performs the inspection, they will submit a report to Public Health - Seattle & King County.
View a sample report (19 KB)
- Public Health staff will review the report within 10 business days.
- You can view On-site Sewage System Property Transfer Inspection Reports at www.onlinerme.com.
- Search for the property of interest, then look in the "Application History".