Wis. Stat. § 88.43: Collection of assessments as delinquent taxes.

(1) If the amounts certified to the town, village or city clerk under s. 88.42 are not collected by the town, village or city treasurer, such treasurer shall return them to the county treasurer, in the same manner and at the same time as delinquent taxes, but separately therefrom. The county treasurer shall collect unpaid drainage assessments under subch. VII of ch. 74.

(4) Unless in conflict with this chapter, the rules of law in chs. 74 and 75 which are applicable to the collection of general taxes apply to the collection of delinquent drainage assessments.