Wash. Admin. Code § 480-90-173
Statutory Authority: RCW 80.01.040 and 80.04.160. 03-24-028 (General Order R-510, Docket No. A-010648), § 480-90-173, filed 11/24/03, effective 1/1/04; 01-11-003 (Docket No. UG-990294, General Order No. R-484), § 480-90-173, filed 5/3/01, effective 6/3/01.