The territory comprised within said district shall consist of the parishes of Iberia, Lafayette, St. Martin and Vermilion. Additional parishes may be added to the district by resolutions duly adopted by the police jury of each parish then included in the district, upon receipt by each of said police juries of a resolution adopted by the police jury requesting inclusion of its parish in the district. The effective date of the inclusion of an additional parish within the district shall be the date on which the appropriate resolution is adopted by the last police jury granting such inclusion.
La. R.S. § 38:3086.2