Oregon Revised Statutes Public Health and Safety § 431.725

(1) Upon receipt of the certified copy of a resolution adopted under ORS 431.715, the Oregon Health Authority shall contact the requesting body within 30 days of receipt of the request and schedule the review and investigation of conditions in the affected territory. The authority shall review and investigate conditions in the affected territory in accordance with the agreed upon schedule unless both parties agree to an extension. If it finds substantial evidence that a danger to public health exists in the territory, it shall issue an order setting a time and place for a hearing on the resolution. The hearing shall be held within the affected territory, or at a place near the territory if there is no suitable place within the territory at which to hold the hearing, not less than 30 or more than 50 days after the date of the order.

(2) Upon issuance of an order for a hearing, the authority shall immediately give notice of the time and place of the hearing on the resolution by publishing the order and resolution in a newspaper of general circulation within the territory once each week for two successive weeks and by posting copies of the order in four public places within the territory prior to the hearing.