Wash. Admin. Code § 220-20-020
Statutory Authority: RCW 77.12.047 and 77.04.020. 09-18-070 (Order 09-187), § 220-20-020, filed 8/28/09, effective 9/28/09. Statutory Authority: RCW 77.12.047. 07-02-050 (Order 06-301), § 220-20-020, filed 12/27/06, effective 1/27/07; 06-13-024 (Order 06-134), § 220-20-020, filed 6/13/06, effective 7/14/06; 06-07-045 (Order 06-39), § 220-20-020, filed 3/9/06, effective 4/9/06; 02-23-002 (Order 02-278), § 220-20-020, filed 11/6/02, effective 12/7/02; 02-02-049 (Order 01-286), § 220-20-020, filed 12/27/01, effective 1/27/02; 00-17-106 (Order 00-149), § 220-20-020, filed 8/16/00, effective 9/16/00. Statutory Authority: RCW 75.08.080. 00-01-103 (Order 99-215), § 220-20-020, filed 12/16/99, effective 1/16/00; 98-15-031 (Order 98-120), § 220-20-020, filed 7/7/98, effective 8/7/98; 97-07-043 (Order 97-51), § 220-20-020, filed 3/14/97, effective 4/14/97; 95-23-020 (Order 95-166), § 220-20-020, filed 11/8/95, effective 12/9/95; 93-14-042 (Order 93-54), § 220-20-020, filed 6/29/93, effective 7/30/93. Statutory Authority: RCW 75.08.080 and 75.28.245. 90-07-003 (Order 90-17), § 220-20-020, filed 3/8/90, effective 4/8/90. Statutory Authority: RCW 75.08.080. 90-06-045 (Order 90-15), § 220-20-020, filed 3/1/90, effective 4/1/90; 80-09-072 (Order 80-69), § 220-20-020, filed 7/18/80; 79-03-014 (Order 79-11), § 220-20-020, filed 2/15/79; Order 77-147, § 220-20-020, filed 12/16/77; Order 77-14, § 220-20-020, filed 4/15/77; Order 76-148, § 220-20-020, filed 12/2/76; Order 76-26, § 220-20-020, filed 4/20/76; Order 1193-A, § 220-20-020, filed 3/5/75; Order 1193, § 220-20-020, filed 3/4/75; Order 1143, § 220-20-020, filed 8/8/74; Order 1105, § 220-20-020, filed 12/28/73; Order 1057, § 220-20-020, filed 5/22/73; Order 1045, § 220-20-020, filed 3/8/73; Order 988, § 220-20-020, filed 4/28/72; Order 920, § 220-20-020, filed 5/13/71; Order 862, § 220-20-020, filed 4/16/70; Order 817, § 220-20-020, filed 5/29/69; Order 810, § 220-20-020, filed 4/17/69.