6 V.S.A. § 1820: Entry into force; additional members

The compact shall enter into force effective when enacted into law by any three states of the group of states composed of Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, and Virginia, and when the consent of Congress has been obtained. This compact shall also be open to states that are contiguous to any of the named states and open to states that are contiguous to participating states.