RCW 68.50.130: Unlawful disposal of remains.

Every person who performs a disposition of any human remains, except as otherwise provided by law, in any place, except in a cemetery, a family burial ground, or a building dedicated exclusively for religious purposes, is guilty of a misdemeanor. Disposition of human remains following cremation, alkaline hydrolysis, or natural organic reduction may also occur on private property, with the consent of the property owner; and on public or government lands or waters with the approval of the government agency that has either jurisdiction or control, or both, of the lands or waters.