La. Stat. tit. 33 § 4066.8
The governing authority of the parish, sewerage district, or commission, or its authorized officer or agent, shall receive bids on the date and at the place and hour named in the notice calling for bids and shall there publicly open and tabulate the bids. The governing authority shall provide for approval of at least three types of septic tanks and at least three types of individual treatment plants in order to avoid one company from monopolizing the supplying of such items to the district creating the sewerage system. All septic tanks and individual treatment plants provided must have prior approval of the Department of Environmental Quality. The contract shall thereafter be awarded to the lowest responsible bidder who can furnish satisfactory security and who is licensed by the state health officer to install individual sewerage systems. The contract awarded under the provisions of this Subpart shall be authorized by resolution authorizing the chief executive officer of the governing authority to execute the contract for, on behalf of, and in the name of the parish, sewerage district, or commission. It shall not be necessary to set forth the contract in full in the resolution, but it shall be sufficient if the resolution refers to a copy of the contract on file in the office of the clerk or secretary where it is available for public inspection.
La. R.S. § 33:4066.8