A legal union, other than a marriage, of two persons that was validly formed in another jurisdiction, and that is substantially equivalent to a domestic partnership under this chapter, shall be recognized as a valid domestic partnership in this state and shall be treated the same as a domestic partnership registered in this state regardless of whether it bears the name domestic partnership.
RCW 26.60.090
Notice- 2012 c 3 : See note following RCW 26.04.010.