Wis. Stat. § 66.0911: Laterals and service pipes.

If the governing body by resolution requires water, heat, sewer and gas laterals or service pipes to be constructed from the lot line or near the lot line to the main or from the lot line to the building to be serviced, or both, it may provide that when the work is done by the city, village or town or under a city, village or town contract, a record of the cost of constructing the laterals or service pipes shall be kept and the cost, or the average current cost of laying the laterals or service pipes, shall be charged and be a lien against the lot or parcel served.