Wash. Admin. Code § 458-20-227
Statutory Authority: RCW 82.32.300. 91-05-039, § 458-20-227, filed 2/13/91, effective 3/16/91; 83-08-026 (Order ET 83-1), § 458-20-227, filed 3/30/83; Order ET 70-3, § 458-20-227 (Rule 227), filed 5/29/70, effective 7/1/70.