Wash. Rev. Code § 85.24.150
The final assessment shall be a lien paramount to all other liens except liens for taxes and other special assessments upon the property assessed, from the time the assessment roll shall have been finally approved by the board, and placed in the hands of the county treasurers as collectors. After the roll shall have been delivered to the county treasurers for collection, each treasurer shall proceed to collect the amounts due in the manner that other taxes are collected as to all lands situated within the county of which he or she is treasurer. The treasurer shall give at least ten days' notice in one or more newspapers of general circulation in the counties in which the lands are situated for two successive weeks, that the roll has been certified to him or her for collection, and that unless payment be made within thirty days from the date of the notice, that the sum charged against each lot or parcel of land shall be paid in not more than ten equal annual payments, with interest upon the whole sum so charged, at a rate not to exceed seven percent per annum. The interest shall be paid annually. The county treasurer shall proceed to collect the amount due each year upon the publication of notice as hereinafter provided. In such publication notice it shall not be necessary to give a description of each tract, piece or parcel of land, or of the names of the owners thereof.
The treasurer shall also mail a copy of the notice to the owner of the property assessed, when the post office address of the owner is known to the treasurer; but the failure to mail the notice shall not be necessary to the validity of the collection of the tax.
RCW 85.24.150