Wis. Stat. § 66.0605: Local government audits and reports.

Notwithstanding any other statute, the governing body of a county, city, village or town may require or authorize a financial audit of a municipal or county officer, department, board, commission, function or activity financed in whole or part from municipal or county funds, or if any portion of the funds are the funds of the county, city, village or town. The governing body may require submission of periodic financial reports by the officer, department, board, commission, function or activity.