Wash. Rev. Code § 50.60.900
Unless inconsistent with or otherwise provided by this section, this title and rules adopted under this title apply to shared work benefits. To the extent permitted by federal law, those rules may make such distinctions and requirements as may be necessary with respect to unemployed individuals to carry out the purposes of this chapter, including rules defining usual hours, days, workweek, wages, and the duration of plans adopted under this chapter. To the extent that any portion of this chapter may be inconsistent with the requirements of federal law relating to the payment of unemployment insurance benefits, the conflicting provisions or interpretations of this chapter shall be deemed inoperative, but only to the extent of the conflict. If the commissioner determines that such a conflict exists, a statement to that effect shall be filed with the governor's office for transmission to both houses of the legislature.
RCW 50.60.900