65 ILCS 5/11-133-1
Any municipality with a population of 500,000 or more, owning and operating its waterworks system, may pay for improving and extending that system by the issuance and sale of certificates of indebtedness of the municipality. These certificates shall bear interest at a rate of not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, payable semi-annually, and shall mature within 25 years from the date thereof; provided that any certificate issued and sold subsequent to December 31, 1965, shall mature within 40 years from the date of issuance.
With respect to instruments for the payment of money issued under this Section either before, on, or after the effective date of this amendatory Act of 1989, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Act that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Act that may appear to be or to have been more restrictive than those Acts.
This amendatory Act of 1973 is not a limit upon any municipality which is a home rule unit.
65 ILCS 5/11-133-1