Wis. Stat. § 62.55
If an office or position in the service of a 1st class city involves fiduciary responsibility or the handling of money, the appointing officer may require the appointee to furnish a bond or other security to the officer and the city for the faithful performance of the appointee's duty. The amount of the bond or security shall be fixed by the appointing officer, with the approval of the mayor. Notice of the mayor's approval shall be given to the city clerk by the mayor. Each bond shall be approved by the city attorney as to form and execution and by the common council as to sufficiency of sureties. Any surety company, the bonds of which are accepted by the judge of any court of record in this state, or which is approved by the comptroller of the city, is sufficient security on the bond. The premium on a bond under this section, within the limits fixed by law, shall be paid out of the city treasury. The appointing officer shall immediately after the execution of the bond file the bond with the city clerk. The city clerk shall require compliance with the terms of this section requiring the filing of bonds with the city clerk by officers and employees. Bonds of city officers and employees under this section, duly witnessed and acknowledged, after being approved by the common council, shall be delivered to the city comptroller, who shall have them recorded in the office of the register of deeds. After the bonds are recorded, the bonds shall be returned to the city clerk, who shall keep them on file in the city clerk's office; except that after the recording of the bond of the city clerk by the city comptroller, that bond shall remain on file in the office of the city comptroller. Each bond filed by any surety company shall be accompanied by a duplicate of the bond. The duplicate shall be filed by the clerk with the city comptroller.
Wis. Stat. § 62.55