Upon adoption or approval of the ordinance, resolution, or agreement, the governing body seeking to withdraw or join the authority shall file either an application to withdraw from or an application to become a member of the authority, whichever applies, with the State Corporation Commission. A joinder application shall set forth all of the information required in the case of original incorporation and shall be accompanied by certified copies of the resolutions, ordinances, or agreement described in subsection C. Joinder and withdrawal applications shall be executed by the proper officers of the withdrawing or incoming locality under its official seal, and shall be joined in by the proper officers of the governing board of the authority, and in the case of a locality seeking to become a member of the authority also by the proper officers of each of the political subdivisions that are then members of the authority, pursuant to resolutions by the governing bodies of such political subdivisions.
Va. Code § 15.2-5112