Wash. Rev. Code § 78.60.270
Whenever it shall appear that any person is violating any provision of this chapter, or any rule, regulation, or order made by the department hereunder, and if the department cannot, without litigation, effectively prevent further violation, the department may bring suit in the name of the state against such person in the court in the county of the residence of the defendant, or in the county of the residence of any defendant if there be more than one defendant, or in the county where the violation is alleged to have occurred, to restrain such person from continuing such violation. In such suit the department may, without bond, obtain injunctions prohibitory and mandatory, including temporary restraining orders and preliminary injunctions, as the facts may warrant.
RCW 78.60.270