Ill. Admin. Code tit. 8, § 675.90
b) The written complaint shall contain the following information concerning the complainant's own well:
13) Use of the well:
c) Within two (2) working days after receiving a written complaint, the District shall schedule a visit to the complainant's well to investigate and determine if the complaint is valid. Access to the complainant's well by the District, the Illinois State Geological survey, and the Illinois Department of Agriculture, shall be permitted by the complainant for investigative purposes. Employees of the before-stated agencies who are investigating the complaint may request permission from any land occupier or person owning a high capacity well that is located within a one mile radius of the affected well for an on-site investigation of that well when data is needed to determine if the high capacity well is affecting the complainant's well. In order to be considered a valid complaint, the investigation must confirm all of the following points: