Wash. Rev. Code § 70.58.230
Permits for burial, removal, etc., required—Removal to another district without permit, notice to registrar, fee
It is unlawful for any person to inter; deposit in a vault, grave, or tomb; perform alkaline hydrolysis or natural organic reduction as defined in RCW 68.04.310; or otherwise dispose of, or disinter or remove from one registration district to another, or hold for more than three business days after death, the human rem…