Wash. Rev. Code § 6.25.060
(1) The plaintiff or someone on plaintiff's behalf shall apply for a writ of attachment by affidavit, alleging that the attachment is not sought and the action is not prosecuted to hinder, delay, or defraud any creditor of the defendant and also alleging that affiant has reason to believe and does believe the following, together with specific facts on which affiant's belief in the allegations is based:
[ 1987 c 442 s 806.]