70 ILCS 605/8-16
A petition of landowners under Section 8--15 must be signed by not less than 100 adult owners of land in the territory sought to be detached, unless there are fewer than 200 adult landowners in such territory, in which event the petition shall be signed by not less than a majority of the adult landowners. Each petition under Section 8--15, whether by landowners, commissioners or corporate authorities, shall contain (a) a description of the boundaries of the territory sought to be detached, (b) the name of the drainage district from which detachment is sought, (c) the name of the municipal corporation in which the lands are situated, (d) a general description of the drains or levees which the municipal corporation has constructed and is maintaining in the exercise of its storm drainage powers, (e) a statement that the storm drainage powers being exercised by the municipal corporation in the territory sought to be detached are of the same nature as the drainage powers being exercised by the drainage district, (f) a statement that the lands sought to be detached constitute all the lands which lie within both the drainage district and the municipal corporation, and (g) a request that such lands be detached from the drainage district. The petition must be verified and shall have attached thereto a map showing the territory sought to be detached.
70 ILCS 605/8-16