Miss. Code Ann. § 57-1-131

When two or more adjoining supervisors districts of adjacent counties which desire to enter jointly into the establishment of an enterprise under the provisions of Sections 57-1-1 through 57-1-51 , the board of supervisors of each county shall declare its intention of entering into such plan by resolution spread upon its minutes and shall jointly with the boards of supervisors of the counties affected file with the Mississippi Agricultural and Industrial Board, a petition for a certificate of public convenience and necessity in the manner and for the purposes prescribed by Section 57-1-21 , and the board of supervisors of each county affected shall name two commissioners who, together with the commissioners appointed by the other counties acting jointly with them, shall constitute a board of commissioners for the purpose of proceeding the same as if the supervisors districts of the adjacent counties were within the same county.

A petition bearing the signatures of a majority of the qualified electors of a supervisors district filed with the chancery clerk, shall make it the mandatory duty of the board of supervisors of the county to pass the necessary resolution, appoint the commissioners and perform all other duties and functions necessary for the establishment of the enterprise.