La. R.S. 38:1674.11

The district, through its board of commissioners, may engage jointly in the exercise of any power, the making of any improvement, or the promotion and maintenance of any undertaking authorized under this Part, with any one or more special districts or other political subdivisions of this state and all of such arrangements shall be undertaken and concluded under the provisions of the Local Services Law (R.S. 33:1321 et seq.).