Wash. Rev. Code § 85.06.590
Upon the issuance of the order as provided for in the next preceding section it shall be the duty of the sheriff of said county to post, at the courthouse of said county and at three public places in said drainage district, and to cause to be published in a newspaper of general circulation in said county a notice of the time and place fixed by said order of court for the hearing of said petition. Said notice shall contain a statement that said petition has been filed as above provided for, that the said court has fixed a time and place for the hearing of said petition, which time and place shall be stated in said notice, a brief statement of the object of said proceeding upon said petition, a statement of the issuance of the said order of court directing the posting and publishing of said notice, a statement that all persons having any interest in any land in such drainage district, describing the same by its corporate name, may at or before the time fixed for said hearing appear and file objections or exceptions to the granting of the prayer of said petition: A statement that upon the hearing of said petition in case no objections or exceptions have been filed in said proceeding, or in case any objections or exceptions filed be not sustained, and that the allegations of said petition are proven to the satisfaction of the court an order will be entered in accordance with the prayer of said petition. That said notice shall be signed by the sheriff of said county.
RCW 85.06.590