Wash. Rev. Code § 41.40.798
(1) All employees who are not qualified under RCW 41.32.836 and who are first employed by an institution of higher education in a position eligible for participation in old age annuities or retirement income plans under RCW 28B.10.400 on or after July 1, 2011, have a period of thirty days to make an irrevocable choice to:
[ 2011 1st sp.s. c 47 s 18.]
Intent—Effective dates—2011 1st sp.s. c 47: See notes following RCW 28B.10.400.