La. Stat. tit. 33 § 3996
Any sewerage district proceeding under the authority of this Subpart may participate in the payment of the total cost of any project authorized hereunder, in such a manner and to such extent that the governing authority of the district may determine, provided that any funds so used by the district shall be in such amounts as it may have available for such purpose and from sources other than the imposition of special assessments. Such participation by the district may be allocated to any one or more projects as the governing authority of the district may determine, and the amount of the district's participation shall be deducted from the total cost of the improvements for the purpose of levying local or special assessments hereunder.
La. R.S. § 33:3996