Oregon Revised Statutes Agriculture § 568.915

(1) After making a reasonable attempt to notify the landowner, the State Department of Agriculture or a designee of the department may enter any lands within the area subject to a water quality management plan for the purpose of determining:

(2) The State Department of Agriculture, or a designee of the State Department of Agriculture, shall periodically, and in no event less than once biennially, consult with the Department of Justice to ensure that the actions of the State Department of Agriculture taken under this section are consistent with section 9, Article I of the Oregon Constitution, and the Fourth Amendment to the United States Constitution.

(3) Prior to general initiation of inspections in an agricultural water quality management area for compliance with rules adopted under ORS 568.912, the department shall implement a process to notify the affected landowners within the boundaries of the area of any requirements that may by rule apply to landowners in the area.