RCW 68.50.110: Burial, cremation, alkaline hydrolysis, or natural organic reduction.

Except in cases of dissection provided for in RCW 68.50.100, and where human remains are rightfully carried through or removed from the state for the purpose of burial elsewhere, human remains lying within this state, and the remains of any dissected body, after dissection, must be decently buried, undergo cremation, alkaline hydrolysis, or natural organic reduction within a reasonable time after death.