Oregon Revised Statutes Public Health and Safety § 468B.150

(1) “Area of ground water concern” means an area of the state subject to a declaration by the Department of Environmental Quality under ORS 468B.175 or the Oregon Health Authority under ORS 448.268.

(2) “Contaminant” means any chemical, ion, radionuclide, synthetic organic compound, microorganism, waste or other substance that does not occur naturally in ground water or that occurs naturally but at a lower concentration.

(3) “Ground water management area” means an area in which contaminants in the ground water have exceeded the levels established under ORS 468B.165, and the affected area is subject to a declaration under ORS 468B.180.

(4) “Fertilizer” has the meaning given that term in ORS 633.311.

(5) “Pesticide” has the meaning given that term in ORS 634.006.