Va. Code Ann. § 56-484.18:4
Any locality may become a member of any existing authority, and any locality that is a member of an existing authority may withdraw therefrom, but no locality shall be permitted to withdraw from any authority after any obligation has been incurred by the authority except by unanimous vote of all members of the authority.
The governing body of any locality wishing to withdraw from an existing authority shall signify its desire by resolution or ordinance. The governing body of any locality wishing to become a member of an existing authority and the governing bodies of the localities that are currently members of the authority shall, by concurrent resolutions or ordinances or by agreement, provide for the joinder of such localities and specify the number and term of office of members of the expanded authority to be appointed by each of the participating localities, together with the name, address, and term of office of initial appointments to membership.
2026, c. 730.