After the creation of a joint system, any other municipality may become a member upon:

1. (a) Adoption of a resolution or ordinance by the governing body complying with the requirements of Section 6-25-40 including publication of notice;
2. (b) Submission of an application to the joint system;

3. (c) Approval of the application by resolution of the governing body of each member of the joint system; except in the case of a joint system organized for the purpose of creating a financing pool, in which case the application must be approved by resolution of the commission.

   Any member may withdraw from a joint system by resolution or ordinance of its governing body. All contractual rights acquired and contractual obligations incurred by a member while it was a member must remain in full force and effect.

   Notice of any change in membership must be filed in the office of the Secretary of State, and no change is final until this filing, provided, however, that the filing is not required if a joint system is organized for the purpose of creating a financing pool.