PER RCW 36.35.120 (3)
Except in cases where the sale is to be by direct negotiation as provided in RCW 36.35.150, the county treasurer must, upon receipt of the order, publish once a week for three consecutive weeks a notice of the sale of the property in a newspaper of general circulation in the county where the land is situated. The notice must describe the property to be sold, the unit or units, the reservations, and the minimum price fixed in the order, together with the time and place and terms of sale, in the same manner as foreclosure sales as provided by RCW 84.64.080. If a public auction sale by electronic media is conducted pursuant to RCW 36.16.145, notice must conform to requirements for a public auction sale by electronic media.
PER COUNTY ORDINANCE 2.20.060
When the board of county commissioners elects to sell property, notice shall be given to the extent the board deems necessary to affect an advantageous sale in the best interest of the public. Advance written notice of the sale of any such surplus real or personal property with a value in excess of five thousand dollars shall include publication in a legal newspaper at least once a week for two consecutive weeks, the last notice to appear no more than five days prior to the date of the auction or bid opening: Except that for surplus property offered at a public auction by an outside entity, that entity’s notification shall be sufficient notice under this section. All notices of sale of surplus county property must particularly describe the property to be sold and designate the day and hour and the place of the sale. When real property is to be sold, the notice of sale must contain both the street address, if available, and the legal description of the part and parcel. If real property is offered for sale on other than a cash basis, the terms must be stated in the notice of sale. In addition, sales of tax title property shall be consistent with RCW 36.35.120, as now enacted or as subsequently amended, including publishing in a legal newspaper at least once a week for three consecutive weeks, the last notice to appear no more than five days prior to the date of the auction.