Wash. Rev. Code § 78.52.540
If the department fails to bring suit within thirty days to enjoin any apparent violation of this chapter, or of any rule, regulation, or order made by the department under this chapter, then any person or party in interest adversely affected by such violation, who has requested the department in writing to sue, may, to prevent any or further violation, bring suit for that purpose in the superior court of any county where the department could have instituted such suit. If, in such suit, the court should hold that injunctive relief should be granted, then the state shall be made a party and shall be substituted for the person who brought the suit, and the injunction shall be issued as if the state had at all times been the complainant.
RCW 78.52.540
Severability-Headings and captions not law-Effective date-1994 sp.s. c 9: See RCW 18.79.900 through 18.79.902.