Wash. Admin. Code § 458-20-221
Statutory Authority: RCW 82.32.300. 89-06-016 (Order 89-4), § 458-20-221, filed 2/23/89, effective 4/1/89; 83-08-026 (Order ET 83-1), § 458-20-221, filed 3/30/83; Order ET 70-3, § 458-20-221 (Rule 221), filed 5/29/70, effective 7/1/70.