For the purpose of defraying the cost of acquiring, constructing, extending, or improving a combined waterworks and sewerage system or any part thereof, any municipality (1) may apply money received therefor from the federal government or available therefor from any source, and (2) may issue and sell revenue bonds of the municipality payable solely from revenue derived from the operation of the combined waterworks and sewerage system. These bonds may be issued in such amounts as may be necessary to provide sufficient funds to pay all the costs of the acquisition, construction, extension, or improvement of the combined waterworks and sewerage system as authorized by Section 11-139-2, including engineering, legal, and other expenses, together with interest to the estimated date of completion of the combined waterworks and sewerage system or of the project to be constructed. The bonds shall bear interest at a rate 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 the period of usefulness of the project involved, to be determined by the corporate authorities and in any event not more than 40 years. The bonds shall be sold in such manner as the corporate authorities shall determine and if issued to bear interest at the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, shall be sold for not less than par and accrued interest. If any of these bonds are issued to bear interest at a rate of less than the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, the minimum price at which they may be sold shall be such that the interest cost to the municipality of the proceeds of the bonds shall not exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, computed to maturity. In case any officer whose signature appears on the bonds or coupons attached thereto ceases to hold that office before the delivery of the bonds to the purchaser, the signature nevertheless shall be valid and sufficient for all purposes, with the same effect as if he had remained in office until the delivery of the bonds. The bonds shall have all the qualities of negotiable instruments under the law of this state.
     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 1971 is not a limit upon any municipality which is a home rule unit.
     This amendatory Act of 1972 is not a limit upon any municipality which is a home rule unit.