This part shall take effect when:
- Two (2) or more of the counties of Montgomery, Houston or Stewart or the cities of Clarksville or Cumberland City are authorized by a majority vote of their respective governing bodies to become members of the authority;
- Evidence of such authorization is proclaimed and countersigned by the presiding officer of each ratifying county and city and certified by that presiding officer to the secretary of state; and
- The governing bodies of all governments voting to become members of the authority have indicated their willingness to appropriate sufficient funds to provide for the initial administration of the authority.