Wash. Admin. Code § 388-827-0100
(2) There are five types of state supplementary payment:
[Statutory Authority: RCW 71A.12.030 and 2015 3rd sp.s. c 4 § 205. WSR 17-13-022, § 388-827-0100, filed 6/12/17, effective 7/13/17. Statutory Authority: RCW 71A.12.030, 71A.10.020, 2002 c 371. WSR 04-02-015, § 388-827-0100, filed 12/29/03, effective 1/29/04.]