Wash. Admin. Code § 220-40-031
Statutory Authority: RCW 77.12.047. 07-21-128 (Order 07-266), § 220-40-031, filed 10/23/07, effective 11/23/07. Statutory Authority: RCW 75.08.080. 91-08-054 (Order 91-13), § 220-40-031, filed 4/2/91, effective 5/3/91; 90-18-023 (Order 90-77), § 220-40-031, filed 8/24/90, effective 9/24/90; 85-06-033 (Order 85-14), § 220-40-031, filed 3/1/85.