Wash. Rev. Code § 49.17.100
A representative of the employer and an employee representative authorized by the employees of such employer shall be given an opportunity to accompany the director, or his or her authorized representative, during the physical inspection of any workplace for the purpose of aiding such inspection. Where there is no authorized employee representative, the director or his or her authorized representative shall consult with a reasonable number of employees concerning matters of health and safety in the workplace. The director may adopt procedural rules and regulations to implement the provisions of this section: PROVIDED, That neither this section, nor any other provision of this chapter, shall be construed to interfere with, impede, or in any way diminish the right of employees to bargain collectively with their employers through representatives of their own choosing concerning wages or standards or conditions of employment which equal or exceed those established under the authority of this chapter.
RCW 49.17.100