The following are links to information by county for looking up property parcel/tax numbers, asbuilts, online reports (RME). and the Washington On-Site Sewage Association (WOSSA). You can use these links to research specific property information and general information related to on-site systems for the listed counties.

See below for the links for county web sites and for Septic as-builts.
Thurston Country Logo
Thurston County as-builts

Thurston County parcel/tax numbers

Pierce County
Pierce County as-builts

Pierce County parcel/tax numbers

Look-up rss app status

Mason County Logo
Mason County parcel/tax numbers & as-builts

Directions: Find Property – Hit “Map Sifter” – go into “Land Records”

King County
King County parcel/tax numbers

King County as-built drawing

Kitsap County Logo
Kitsap County parcel/tax numbers
Kitsap Public Health District
Kitsap health district
You can also map the areas for all of these counties in the parcel/tax numbers websites.
Look up all reports filed in RME — Also find Kitsap County as-builts

Directions: Find Property – click on “Get Info” on right-hand side and click on “View Scanned Images”

WOSSA
Washington On-Site Sewage Association