Wash. Admin. Code § 192-510-070
(1) An employee's work is subject to all reporting requirements and premiums when the work is localized in Washington. An employee's work is considered localized in Washington when:
(2) Services that are not localized in Washington will be subject to reporting requirements and premiums when the services are not localized in any state, but some of the services are performed in Washington, and:
(b) The base of operations or place from which such service is directed or controlled is not in any state in which some part of the service is performed, but the individual's residence is in Washington.
Example: A storm hits Washington. An employer in Oregon dispatches an employee who typically lives and works in Oregon to help with repair work. The employee works temporarily in Washington for the employer for one week, and then returns to work in Oregon for the employer. The employment is localized within Oregon and is not subject to premium assessment.
[Statutory Authority: RCW 50A.04.215. WSR 18-12-032, § 192-510-070, filed 5/29/18, effective 6/29/18.]