Wash. Rev. Code § 11.66.010
Social security benefits—Payment to survivors or department of social and health services—Effect
(1) If not less than thirty days after the death of an individual entitled at the time of death to a monthly benefit or benefits under Title II of the social security act, all or part of the amount of such benefit or benefits, not in excess of one thousand dollars, is paid by the United States to (a) the surviving spou…