La. Stat. tit. 33 § 4283
Upon obtaining the authority from a majority of the qualified electors of the municipality voting in the election, the governing body of the municipality may issue negotiable certificates of indebtedness which shall be payable solely from the income and revenues to be derived from the operation of the revenue producing utility or the franchises thereof. These certificates of indebtedness shall not constitute an indebtedness or pledge of the general credit of the municipality within the meaning of any constitutional or statutory limitation of indebtedness and shall contain a recital to that effect. The certificates of indebtedness shall be in coupon form, but may be registerable as to principal if so provided in the proceedings authorizing their issuance. The certificates of indebtedness shall be in the denominations of one hundred dollars or a multiple thereof, shall bear interest at a coupon rate not exceeding six per cent per annum, shall mature serially or otherwise, (but shall not mature later than twenty years from the date of issuance) shall be made payable at the place either within or without the state provided by the proceedings authorizing their issuance, and may be made redeemable at the option of the governing authority of the municipality prior to maturity at premiums not greater than ten per cent of the principal amount thereof. The certificates of indebtedness shall be signed by the chief executive officer under the official seal of the municipality in the manner provided in the proceedings authorizing their issuance. Interest coupons to be attached thereto may be executed with the facsimile signature of such officer, and in the event that any official whose signature appears on the certificates of indebtedness or coupons ceases to occupy his office before the delivery of the certificates to the purchaser, his signature shall nevertheless be valid and sufficient for all purposes. The certificates of indebtedness shall be sold at public sale after thirty days' advertisement in a newspaper in the municipality or in the parish in which the municipality is located, in such manner and at such times as the governing authority may determine, except that in no event shall the certificates be sold at less than their par value.
La. R.S. § 33:4283