Wash. Rev. Code § 48.12.420
(1) Credit is allowed when the reinsurance is ceded to an assuming insurer that is domiciled in, or in the case of a United States branch of an alien assuming insurer is entered through, a state that employs standards regarding credit for reinsurance substantially similar to those applicable under this statute and the assuming insurer or United States branch of an alien assuming insurer:
[ 2015 c 63 s 5.]