(1) All provisions of Section 19-5-301 et seq., with the exception of Section 19-5-307, shall be construed to amend, repeal or supersede any local and private act under which a county or municipality has, prior to the effective date of Section 19-5-301 et seq., established an emergency communications district.

(2) The governing authorities of any municipality which has established an emergency communications district under the provisions of a local and private act enacted prior to the effective date of Section 19-5-301 et seq., may merge such district with the district established by the county in which the municipality is located, by order duly adopted and entered on the minutes of the governing authority and after the board of supervisors has duly adopted and entered on its minutes a similar order. After the county and the municipal districts have been merged, the local and private act for such municipality shall be of no force or effect.

(3) Two (2) or more counties may, by order duly adopted and entered on their minutes, establish a single emergency communications district to be composed of all of the territory within such counties provided that before the establishment thereof the board of supervisors of each of such counties has established an emergency communications district for its county in accordance with Section 19-5-305. When two (2) or more counties have established a single emergency communications district for the counties as provided under this subsection, the board of commissioners of the district shall consist of the members of the board of supervisors of each of such counties or seven (7) members from each county to be appointed as provided in Section 19-5-307.