Wis. Stat. § 778.12

The town chairperson shall forthwith notify the district attorney of the county of every forfeiture which he or she knows, has reason to believe or which he or she has been so informed has been incurred in the town, which cannot be recovered before a municipal court, who shall forthwith cause an action to be commenced for the recovery thereof as well as for the recovery of every forfeiture which he or she otherwise knows or has reason to believe has been incurred; and the district attorney shall attend to and conduct any action so commenced by the chairperson, when requested by him or her so to do.