Oregon Revised Statutes Public Health and Safety § 468B.217

(a) May perform any function of the Environmental Quality Commission or the Department of Environmental Quality relating to the control and prevention of water pollution from a confined animal feeding operation.

(b) May enter onto and inspect, at any reasonable time, a confined animal feeding operation or appurtenant land for the purpose of investigating a source of water pollution or to ascertain compliance with a statute, rule, standard or permit condition relating to the control or prevention of water pollution from the operation. The State Department of Agriculture shall have access to a pertinent record of a confined animal feeding operation including but not limited to a blueprint, design drawing and specification, maintenance record or log, or an operating rule, procedure or plan.