Illinois Statutes Chapter 50. Local Government § 335/1. Authorization for joint expenditures

§ 1. That a sanitary district created under An Act to create sanitary districts and to provide for sewage disposal, approved June 22, 1917, as amended,  1 and cities and villages, whether special charter or otherwise, may mutually join in the hereinafter set forth acts if the city or village and the sanitary district include substantially the same area and they join together for the purposes set forth in the act aforesaid.