Wash. Admin. Code § 390-18-020
Statutory Authority: RCW 42.17A.110. 12-03-002, § 390-18-020, filed 1/4/12, effective 2/4/12. Statutory Authority: RCW 42.17.370 and 42.17.562. 06-11-132, § 390-18-020, filed 5/23/06, effective 6/23/06. Statutory Authority: RCW 42.17.370(1). 99-12-067, § 390-18-020, filed 5/27/99, effective 6/27/99. Statutory Authority: RCW 42.17.370. 93-16-064, § 390-18-020, filed 7/30/93, effective 8/30/93. Statutory Authority: RCW 42.17.370(1). 85-15-020 (Order 85-03), § 390-18-020, filed 7/9/85.