Wash. Rev. Code § 3.50.045
(1) A municipal court judicial officer shall not preside in any of the following cases:
(b) When the judicial officer or one of the parties believes that the parties cannot have an impartial trial or hearing before the judicial officer. The judicial officer shall disqualify himself or herself under the provisions of this section if, before any discretionary ruling has been made, a party files an affidavit that the party cannot have a fair and impartial trial or hearing by reason of the interest or prejudice of the judicial officer. The following are not considered discretionary rulings:
[ 2008 c 227 s 9.]
Effective date—Subheadings not law—2008 c 227: See notes following RCW 3.50.003.