RCW 86.09.451: Assessments—Notice of appeal.

No such appeal shall be entertained by the court unless notice of the same containing a statement of the substance of the matter complained of and the manner in which the same injuriously affects the appellant's interests shall have been served personally or by registered mail, upon the county legislative authority of the county within which the major portion of the district is situated, and upon the secretary of the district, within twenty days following the date of the determination appealed from.