Wash. Admin. Code § 391-75-080
Before accepting an appointment as an arbitrator from either the dispute resolution panel or the law enforcement arbitrator roster, or as soon as information giving rise to a problem of appearance of fairness becomes known, a person serving in an impartial capacity shall disclose to the parties and to the executive director any circumstances likely to create an appearance of bias or which might disqualify that person from serving in the impartial capacity. Employment of the person or any member of their immediate family by any party is disqualifying. Each party to the proceeding shall immediately notify the executive director and the appointee or selectee whether it is willing to waive disqualification. If either party declines to waive the disqualification, the appointment must be vacated.
Wash. Admin. Code § 391-75-080