Wis. Stat. § 287.93
Any officer, employee or authorized representative of the department may enter and inspect any place at which a solid waste facility is located or is being constructed or installed, or inspect any record relating to solid waste management of any person who generates, transports, treats, stores or disposes of solid waste, at any reasonable time for the purpose of ascertaining the state of compliance with this chapter and rules promulgated under this chapter. No person may refuse entry or access to any officer, employee or authorized representative of the department who requests entry or access for purposes of inspection, and who presents appropriate credentials. No person may obstruct, hamper or interfere with any such inspection. The department, if requested, shall furnish to the owner or operator of the premises a report setting forth all facts found that relate to compliance status.
Wis. Stat. § 287.93