70 ILCS 605/4-3
No person shall be appointed or elected commissioner of a district who is not an adult resident of Illinois. Neither shall any person be appointed or elected commissioner of a district who does not own land in the district unless (a) the court in election districts or the appointing authority in other districts finds it to be in the best interests of the district that the requirement of ownership of land in the district be waived or (b) the selection of commissioners is by appointment and a majority of the adult landowners owning a majority of the area embraced in the district have duly petitioned the appropriate appointing authority to allow the appointment as commissioner of an individual who does not own land in the district.
70 ILCS 605/4-3