La. Stat. tit. 33 § 4051
The governing authority of any parish may create within such parish one or more consolidated sewerage districts comprised of one or more existing sewerage districts, together with, if so determined by the governing authority, territory not within the boundaries of an existing sewerage district. No sewerage district the governing body of which is not the governing authority of the parish may be included in any consolidated district without the approval of the governing body of such district to be evidenced by resolution, and no sewerage district lying wholly or partially within the limits of an incorporated municipality may be so included in a consolidated district without the consent of the governing authority of such municipality to be evidenced by resolution. Consolidated sewerage districts so created shall constitute sewerage districts within the meaning of Part III of Chapter 4 of Subtitle II of Title 39 of the Louisiana Revised Statutes of 1950, and as such shall enjoy all rights, powers, and privileges enjoyed by other sewerage districts under the provisions of said section, including the right to issue bonds, and shall have the right to issue certificates of indebtedness secured by local or special assessments. The governing authority of each such consolidated sewerage district shall be the governing authority of the parish creating the district.
La. R.S. § 33:4051