2011 ORS § 262.045¹
Procedure for modification of or withdrawal from agency membership

(1) After the formation of a joint operating agency, the legislative body of any city or district not a member of the joint operating agency may adopt an ordinance and apply to the joint operating agency for membership. Such an ordinance shall not be effective unless approved by electors of the city or peoples utility district as provided by ORS 262.025 (Procedure for joint operating agency formation).

(2) Upon the affirmative vote of a majority of the members of the joint operating agency, as evidenced by resolutions adopted by their respective legislative bodies and filed with the joint operating agency, an application for membership shall be accepted. As a condition of approving such an application, the members of a joint operating agency may require the applicant to make contributions or commitments to place the applicant in substantial parity with the existing members.

(3) A member may not withdraw from a joint operating agency, nor may a joint operating agency be dissolved, while the agency has outstanding revenue obligations for which repayment provision has not been made. When a joint operating agency has no such outstanding revenue obligations:

(a) Any member may withdraw from the joint operating agency, but will thereby forfeit any and all rights and interests which it may have in the agency and the assets thereof unless the remaining members, by resolution of their respective legislative bodies and filed with the joint operating agency, unanimously consent otherwise; however, a member may not withdraw if, following its withdrawal, the joint operating agency would have less than three members. Any withdrawing member shall remain fully liable and responsible for all contractual obligations incurred by it to the joint operating agency during the period of its membership according to the terms of such obligations.

(b) The joint operating agency may be dissolved by the unanimous agreement of the members, as evidenced by resolutions adopted by their respective legislative bodies and filed with the joint operating agency. After provision has been made for the payment of all of the dissolved agencys debts and obligations, the members shall hold its remaining assets as tenants in common. [1973 c.722 §5]