Washington Revised Code Title 49. Labor Regulations § 49.48.090. Assignment of wages--Requisites to validity

No assignment of, or order for, wages to be earned in the future to secure a loan of less than three hundred dollars, shall be valid against an employer of the person making said assignment or order unless said assignment or order is accepted in writing by the employer, and said assignment or order, and the acceptance of the same, have been filed and recorded with the county auditor of the county where the party making said assignment or order resides, if a resident of the state, or in which he or she is employed, if not a resident of the state.