Wash. Admin. Code § 296-841-20015
Require employees to use respirators when airborne hazards have not been removed using feasible exposure controls. For example, use respirators at any of the following times:
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 17-18-075, § 296-841-20015, filed 9/5/17, effective 10/6/17; WSR 07-05-062, § 296-841-20015, filed 2/20/07, effective 4/1/07; WSR 03-20-115, § 296-841-20015, filed 10/1/03, effective 1/1/04.]