8 CAR § 21-510. Oil and grease

(a) Oil, grease, or petrochemical substances shall not be present in receiving waters to the extent that they produce globules, other residue, or any visible, colored film on the surface; coat the banks and/or bottoms of the waterbodies; or adversely affect any of the aquatic biota. (b) Oil and grease shall be an average of no more than ten milligrams per liter (10 mg/L) or a maximum of no more than fifteen milligrams per liter (15 mg/L). (c) No mixing zones are allowed for discharges of oil and grease.