65 ILCS 5/11-130-6

Revenue bonds issued under this Division 130 shall be payable solely from the revenue derived from the operation of the waterworks on account of which the bonds were issued. These bonds shall not in any event constitute an indebtedness of the municipality within the meaning of any constitutional or statutory limitation. It shall be plainly stated on the face of each bond that the bond has been issued under this Division 130 and that it does not constitute an indebtedness of the municipality within the meaning of any constitutional or statutory limitation.