Oregon Revised Statutes Public Health and Safety § 454.165

(1) Any two, or more, municipalities, counties or other political subdivisions, notwithstanding any limitation or provision of municipal charter to the contrary, may, through their respective governing bodies, enter into and perform such contracts and agreements as they consider proper for or concerning the planning, construction, lease or other acquisition and the financing of the disposal system and the maintenance and operation thereof.

(2) Municipalities, counties or other political subdivisions so contracting with each other may also provide in any contract or agreement for a board, commission or such other body as their governing bodies consider proper for the supervision and general management of the disposal system and for the operation thereof, and may prescribe its powers and duties and fix the compensation of the members thereof.