RCW 50.40.020

Any assignment, pledge, or encumbrance of any right to benefits which are or may become due or payable under this title shall be void. Such rights to benefits shall be exempt from levy, execution, attachment, or any other remedy whatsoever provided for the collection of debts, except as provided in RCW 50.40.050. Benefits received by any individual, so long as they are not commingled with other funds of the recipient, shall be exempt from any remedy whatsoever for collection of all debts except debts incurred for necessaries furnished such individual or his or her spouse or dependents during the time when such individual was unemployed. Any waiver of any exemption provided for in this section shall be void.