70 ILCS 605/2-9

Drains and levees for mutual benefit-Permission to connect.

It is unlawful for any person to connect a ditch, covered drain or levee with any drain or levee deemed to be for the mutual benefit of the lands connected or protected without the consent of all parties interested in such drain or levee. When an unlawful connection is made, any interested person may recover damages and, if an unlawful connection is made to a covered drain, may compel disconnection.