(1) Any or all of the states of Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming shall be eligible to become party to this compact.
(2) As to any eligible party state, this compact shall become effective when its legislature shall have enacted the same into law: provided, that it shall not become initially effective until enacted into law by five states.
(3) Any party state may withdraw from this compact by enacting a statute repealing the same, but no such withdrawal shall take effect until two years after the governor of the withdrawing state has given notice in writing of the withdrawal to the governors of all other party states. No withdrawal shall affect any liability already incurred by or chargeable to a party state prior to the time of such withdrawal.
(4) Guam and American Samoa, or either of them may participate in the compact to such extent as may be mutually agreed by the Board and the duly constituted authorities of Guam or American Samoa, as the case may be. However, such participation shall not include the furnishing or receipt of mutual aid pursuant to Article VI, unless that Article has been enacted or otherwise adopted so as to have the full force and effect of law in the jurisdiction affected. Neither Guam nor American Samoa shall be entitled to voting participation on the Board, unless it has become a full party to the compact.