70 ILCS 605/8-3

When any land lying outside of a district has been connected to a district drain or has been or will be benefited or protected by any district work done or ordered to be done, the commissioners may petition the court to annex such land to the district. The petition shall include a description of the land proposed to be annexed, the name of the owner, when known, and a general description of the connection which has been made or a general description of the manner in which the land has been or will be benefited or protected.