Oregon Revised Statutes Utility Regulation § 758.230

(1) Upon presentation of the petition and certificate of sufficiency, or upon adoption of an ordinance or resolution, the public authority shall proceed in the manner provided by ORS 223.389.

(2) Unless the charter of a county provides otherwise, a county shall declare a proposed conversion abandoned if, after notice as provided by ORS 223.389, objections to the conversion are received by a county court or board of county commissioners signed by more than 50 percent of the landowners within the proposed assessment district who own more than 50 percent of land within the district. If a proposed conversion is abandoned because of objections, no new proceeding for the conversion shall be undertaken within a period of one year thereafter.