The employer must make sure warning signs are posted at the entrances or boundaries of all well-defined work areas where employees may be exposed to noise that equals or exceeds 115 dBA (measured using a sound level meter with slow response).
Warning signs must clearly indicate that the area is a high noise area and that hearing protectors are required.
Wash. Admin. Code § 296-307-63225
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 05-01-166, § 296-307-63225, filed 12/21/04, effective 4/2/05.