La. Stat. tit. 38 § 3086.25
The purpose of this Part is to make it possible for the fresh water district which is hereby created to provide and maintain in Bayou Lafourche a source of fresh water supply from Donaldsonville to the Gulf of Mexico and that nothing in this Part is to be construed as impairing the right and authority of the municipalities as defined by the constitution, including police juries of the several parishes involved, to create and maintain and operate waterworks districts and sub-waterworks districts as is presently provided for in R.S. 33:3811 through 3832, or as may be hereafter provided by law. Any waterworks district or sub-waterworks district so created shall not be permitted to take its supply of water from the Bayou Lafourche Fresh Water District herein created except after adequate compensation paid therefor to the Bayou Lafourche Fresh Water District in accordance with the rates prescribed by the governing authority of the district under the powers herein conferred, which rates shall be equal and uniform for all municipalities and industries purchasing such water within the district.
La. R.S. § 38:3086.25