Washington Revised Code Title 49. Labor Regulations § 49.60.160. Refusals may be punished as contempt of court

In case of contumacy or refusal to obey a subpoena issued to any person, the superior court of any county within the jurisdiction of which the investigation, proceeding, or hearing is carried on or within the jurisdiction of which the person guilty of contumacy or refusal to obey is found or resides or transacts business, upon application by the commission shall have jurisdiction to issue to such person an order requiring such person to appear before the commission, its member, agent, or agency, there to produce evidence if so ordered, or there to give testimony touching the matter under investigation or in question. Any failure to obey such order of the court may be punished by the court as a contempt thereof.