Wash. Rev. Code § 52.22.041
The court shall fix the time for the hearing of the petition and direct the clerk of the court to give notice of the filing of the petition and of the time and place fixed for the hearing. The notice shall state the time and place of the hearing of the petition and that any person interested in the proceedings sought by the petition to be examined, approved, and confirmed by the court, may on or before the date of the hearing of the petition, answer the petition. The petition may be referred to and described in the notice as the petition of the board of fire commissioners of . . . . . . county fire protection district No. . . . . . . . . . . (giving the county and its number or any other name by which it is officially designated), requesting that the proceedings (naming them as set out in the request of the petition), be examined, approved, and confirmed by the court, and shall be signed by the clerk.
The notice shall be given by posting and publishing for the same length of time that the notice of the hearing on the petition before the county legislative body to form the district was required by law to be posted and published, and it may be published in any legal newspaper designated in the order of the court fixing the time and place of the hearing of the petition and directing the clerk of the court to give notice thereof.
RCW 52.22.041
Public hearing-Notice-Publication and posting: RCW 52.02.050.