Wash. Admin. Code § 220-40-020
Statutory Authority: RCW 77.04.020, 77.12.045, and 77.12.047. 10-12-061 (Order 09-108), § 220-40-020, filed 5/27/10, effective 6/27/10. Statutory Authority: RCW 75.08.080. 89-16-056 (Order 89-71), § 220-40-020, filed 7/28/89, effective 8/28/89; 86-15-016 (Order 86-55), § 220-40-020, filed 7/10/86; Order 1221, § 220-40-020, filed 7/1/75; Order 1116, § 220-40-020, filed 4/30/74; Order 1049, § 220-40-020, filed 4/11/73; Order 995, § 220-40-020, filed 6/8/72; Order 925, § 220-40-020, filed 6/3/71; Order 864, § 220-40-020, filed 5/12/70; Order 813, § 220-40-020, filed 5/5/69; Order 772-B, filed 4/15/68; Order 726, § 4 (part), filed 4/24/67; subsections 1 and 5 from Orders 341 and 256, filed 3/1/60; subsection 2 from Order 677, filed 3/31/66; Order 569, filed 4/11/63; subsection 6 from Order 679, filed 4/20/66; Orders 341 and 256, filed 3/1/60; subsections 3 and 4 from Order 525, filed 5/3/61; Orders 341 and 256, filed 3/1/60.