Wash. Admin. Code § 220-412-030
Statutory Authority: RCW 77.12.047. 09-19-084 (Order 09-215), § 232-12-073, filed 9/17/09, effective 10/18/09; 08-03-088, § 232-12-073, filed 1/16/08, effective 2/16/08; 03-01-077 (Order 02-298), § 232-12-073, filed 12/13/02, effective 1/13/03.