Wis. Stat. § 30.291: Inspections for certain exemptions and permitted activities.

(1) For purposes of determining whether an exemption is appropriate under s. 30.12 (1k), (2m) or (2r), 30.123 (6m) or (6r), or 30.20 (1m) or (1r), whether a general permit is appropriate under s. 30.206 (3), or whether authorization to proceed under a general permit is appropriate under s. 30.206 (3r), any employee or other representative of the department, upon presenting his or her credentials, may enter the site and inspect any property on the site.

(3) The department shall provide reasonable advance notice, before entering the site and inspecting the property.

(4) If the owner of the site refuses to give consent for an entry and inspection to determine whether authorization to proceed under a general permit is appropriate under s. 30.206 (3r), the department shall deny authorization to proceed under the general permit and shall allow an application to be submitted for an individual permit for the activity.