Oregon Revised Statutes Public Health and Safety § 454.300

(1) At the hearing on the resolution or ordinance, any interested person shall have a reasonable opportunity to be heard or to present written testimony. The hearing shall be for the purpose of determining whether a threat to drinking water exists in the affected area, whether the conditions could be eliminated or alleviated by treatment works and whether the proposed treatment works are the most economical method to alleviate the conditions. The hearing may be conducted by the Environmental Quality Commission or by a hearings officer designated by the commission. After the hearing the commission shall publish a notice of issuance of its findings and recommendations in the newspaper used for the notice of hearing under ORS 454.295 (2), advising of the opportunity for argument under subsection (2) of this section.

(2) Within 15 days after the publication of notice of issuance of findings any person or municipality that will be affected by the findings may petition the commission to present written or oral arguments on the proposal. If a petition is received, the commission shall set a time and place for argument.