Wash. Admin. Code § 415-106-225
Standby means you are required by your employer to be prepared to report immediately for work if the need arises, although the need may not arise. According to RCW 41.37.010:
[Statutory Authority: RCW 41.50.050. WSR 22-13-091, § 415-106-225, filed 6/13/22, effective 7/14/22. Statutory Authority: RCW 41.50.050(5) and 41.37.010(6). WSR 08-02-046, § 415-106-225, filed 12/27/07, effective 1/27/08.]