WAT § 51656

If a call of an assessment on any parcel sold and conveyed to the county treasurer as trustee for the district pursuant to the provisions of this chapter, becomes delinquent during the periods the parcel is so held and the property is not again sold at a delinquency sale, nevertheless, for the purposes of Chapter 5 of this part, the property shall be considered to have been sold and purchased at delinquency sale by the county treasurer as trustee for the district as of the date of the delinquency for the amount of the delinquent call, penalties and interest.