Addendum 22L

In a purchase and sale there is the main body of the purchasing and sale documents and then there are the addenda, the additions or supplements to the existing documents. As of January 19, 2009, a new requirement was set forth by King County (Board of Health Code Section 13.60.030) that all single family residential homes with on-site sewage systems (OSS) or sewer that art not connected to public or city sewers must have a licensed King County On-Site System Maintainer (OSM) to perform inspection on existing OSS prior to the transfer of title). This form is called the Northwest Multiple Listing Service (NWMLS) 22L King County Septic Addendum. In short, if you are a homeowner who want to sell your home and the property is on septic, you will need to have an OSM inspector evaluate your septic tank before you can have the property transferred to the new owner.

1. The Septic inspector must be OSM certified.
2. Have a record of a drawing of the septic or an "As-Built", this can be requested through King County public records. If none exist, the OSM inspector may be required to draw one up. Ask about cost & procedures, if they exist.
3. If the septic had a diagnostic done within the past six-months, or you are no longer on septic and are now connected to a public sewer, you can request a waiver.
4. Communicate with the septic pumper and OSM inspector if they are not of the same company, in case they may need to relay necessary information to each other.
5. Before pumping, call your OSM inspector. An OSM inspector may need a full septic tank to run a proper diagnostic and the pumper may need an empty tank to inspect the tank's internal condition.
6. Buyers are responsible for the "Operation and Maintenance Program Fee" set forth by King County.
7. Sellers are responsible for the "Operation and Maintenance Report" plus any "applicable" fee as set forth by King County.

(I'm still looking for those fee schedules. If I find them, I'll post them later on).

OSS Public Records Request
OSS Property Transfer
OSS Property Transfer Waiver
Licensed OSM Inspectors
Liquid Waster Pumper/Hauler