75-6-320. Revenue bonds. For constructing or acquiring any water supply, wastewater transportation, or treatment system for the authorized purposes of the authority or as necessary or incidental to the authorized purposes, for constructing improvements and extensions to improvements, and for reimbursing or paying the costs and expenses of creating the authority, the governing body of an authority may borrow money from time to time and in evidence of the borrowing issue revenue bonds of the authority. The revenue bonds are a lien on the revenue produced from the operation of the authority's system, but may not be general obligations of the public agencies participating in the agreement. All revenue bonds issued under this part must be signed by the president of the governing body of the authority and attested by the secretary of the governing body of the authority. The bonds must contain recitals stating the authority under which the bonds are issued, that they are to be paid by the authority from the net revenue derived from the operation of the authority's system and not from any other fund or source, and that the bonds are negotiable and payable solely from the revenue derived from the operation of the system under control of the authority. However, in the case of a regional water and wastewater authority, the statutory lien created by this section is a lien only on the revenue of that service funded by the proceeds of the sale of the bonds, it being understood that the combined authority shall maintain separate books and records for its water and wastewater operations. The bonds may be issued in one or more series, may bear a date or dates, may mature at a time or times not exceeding 40 years from their respective dates, may bear interest at a rate not exceeding 2% above the interest rate on treasury notes, bills, or bonds of the same term as the term of the bond or bonds the week of closing on the bond or bonds as reported by the treasury of the United States, may be payable at the times, may be in the form, may carry registration privileges, may be executed in the manner, may be payable at a place or places, may be subject to terms of redemption with or without premium, may be declared or become due before the maturity date, may be authenticated in any manner and upon compliance with the conditions, and may contain terms and covenants that may be provided by resolution or resolutions of the governing body of the authority. Notwithstanding the form or tenor of the bonds, and in the absence of any express recital on the face of the bonds, that the bonds are nonnegotiable, all bonds must be, and must be treated as, negotiable instruments for all purposes. Bonds bearing the signatures of officers in office on the date of the signing of the bonds must be valid and binding for all purposes, notwithstanding that before the delivery of the bonds, any of the persons whose signatures appear on the bonds ceased to be officers. Notwithstanding the requirements or provisions of any other law, bonds may be negotiated or sold in the manner and at the time or times that are found by the governing body to be most advantageous, and all bonds may be sold at the price that the interest cost of the proceeds from the bonds does not exceed 3% above the interest rate on treasury notes, bills, or bonds of the same term as the term of the bond or bonds the week of closing on the bond or bonds as reported by the treasury of the United States, based on the average maturity of the bonds and computed according to standard tables of bond values. Any resolution or resolutions providing for the issuance of the bonds may contain covenants and restrictions upon the issuance of additional bonds that are considered necessary or advisable for the assurance of the payment of the bonds authorized by the resolutions.