Forms/By state/WashingtonWashington septic permit forms6 jurisdictions in Washington, with 14 forms ready to fill online. Pick yours to see what it asks for.Statewide forms9 forms · 9 readyClallam County1 form · 1 readyClark County1 form · 1 readyKittitas County1 form · 1 readyPierce County1 form · 1 readySnohomish County1 form · 1 ready