Wash. Rev. Code § 85.08.500
Property subject to a drainage or diking or sewerage improvement district assessment, acquired by a county pursuant to a foreclosure and sale for general taxes, when offered for sale by the county, shall be offered for the amount of the general taxes for which the same was struck off to the county, together with all drainage or diking or sewerage improvement district assessments or installments thereof, due at the time of such resale, including maintenance assessments, and supplemental assessments levied pursuant to the provisions of RCW 85.08.520, coming due while the property was held in the name of the county; and the property shall be sold subject to the lien of all drainage or diking or sewerage improvement district assessments or installments thereof not yet due at the time of such sale, and the notice of sale and deed shall so state. PROVIDED, That the county board may in its discretion, sell said property at a lesser sum than the amount for which the property is offered in the notice of sale. The proceeds of such sale shall be applied first to discharge in full the lien or liens for general taxes for which said property was sold, and the remainder, or such portion thereof as may be necessary, shall be applied toward the discharge of all drainage or diking or sewerage improvement district assessment liens upon such property, and the surplus, if any, shall be applied toward the payment of any delinquent or due local assessments or local assessment installments outstanding against the property levied by any authority other than that of the county, taking them in the order of their maturities, beginning with the earliest; after which if any money remains the treasurer shall hold the same for the person whose interest in the property entitles him or her thereto. If there be no purchaser, the property shall again be offered for sale within one year thereafter, and shall be successively offered for sale each year until a sale thereof be effected.
Property struck off to or bid in by a county may be leased pursuant to resolution of the county commissioners on such terms as the commissioners shall determine for a period ending not later than the time at which such property shall again be offered for sale as required by law. Rentals received under such lease shall be applied in the manner hereinabove provided for the proceeds of sale of such property.
All statements of general state taxes where drainage, diking, or sewer [sewerage] improvement district assessments against the land described therein are due shall include a notation thereon or be accompanied by a statement showing such fact.
RCW 85.08.500