Oregon Revised Statutes Public Health and Safety § 468B.175

(1) If, as a result of its statewide monitoring and assessment activities under ORS 468B.190, the Department of Environmental Quality confirms the presence in ground water of contaminants suspected to be the result, at least in part, of nonpoint source activities, the department shall declare an area of ground water concern. The declaration shall identify the substances confirmed to be in the ground water and all ground water aquifers that may be affected.

(2) Before declaring an area of ground water concern, the agency making the declaration shall have a laboratory confirm the results that would cause the agency to make the declaration.