20 ILCS 3515/19
The powers conferred by this Act shall be in addition and supplementary to, and the limitations by this Act shall not affect the powers conferred by any other law. Environmental facilities may be acquired, constructed, reconstructed, repaired, altered, improved, and extended and bonds may be issued under this Act for said purposes notwithstanding that any other law may provide for the acquisition, construction, reconstruction, repair, altering, improvement and extensions of like environmental facilities, or the issuance of bonds for like purposes, and without regard to the requirements, restrictions, limitations or other provisions contained in any other law. If any one or more sections or provisions of this Act, or the application thereof to any person or circumstance, shall ever be held by any court of competent jurisdiction to be invalid, the remaining provisions of this Act and the application thereof to persons or circumstances other than those to which it is held to be invalid, shall not be affected thereby, it being the intention of this General Assembly to enact the remaining provisions of this Act notwithstanding such invalidity.
20 ILCS 3515/19