65 ILCS 5/11-148-7

The purpose of Sections 11-148-1 through 11-148-6 is the elimination or lessening of pollution of streams within the State of Illinois, and is particularly for the benefit of adjacent municipalities whose territory is located partially in the State of Illinois and partially in an adjacent state, and whose sewage disposal can be most efficiently and economically handled by a joint plant for the 2 municipalities. The sections specified shall be liberally construed to give effect to these purposes.