Wash. Rev. Code § 80.36.250
The commission may investigate all interstate rates and charges, classifications, or rules or practices relating thereto, for or in relation to the transmission of messages or conversations. Where any acts in relation thereto take place within this state which, in the opinion of the commission, are excessive or discriminatory, or are levied or laid in violation of the federal communications act of June 19, 1934, and acts amendatory thereof or supplementary thereto, or are in conflict with the rulings, orders, or regulations of the Federal Communications Commission, the commission shall apply by petition to the Federal Communications Commission for relief, and may present to such federal commission all facts coming to its knowledge respecting violations of such act or the rulings, orders, or regulations of the federal commission.
RCW 80.36.250