Wash. Rev. Code § 18.80.080
(2) The interstate commission shall be entitled to receive service of process in any proceeding that may affect the powers, responsibilities, or actions of the interstate commission, and shall have standing to intervene in such a proceeding for all purposes. Failure to provide service of process in such proceeding to the interstate commission shall render a judgment or order void as to the interstate commission, this compact, or promulgated rules.
(a) If the interstate commission determines that a party state has defaulted in the performance of its obligations or responsibilities under this compact or the promulgated rules, the interstate commission shall:
(3)
(c) In the event the interstate commission cannot resolve disputes among party states arising under this compact:
(4)
[ 2023 c 123 s 10.]