33 CFR § 151.69 - Operating requirements: Discharge of garbage outside special areas.
(a) Except for ships operating in the Great Lakes which must comply with section 151.66, when a ship is operating outside of a special area specified in § 151.53, no person may discharge garbage into the sea, except as allowed in paragraphs (b) through (d) of this section.
(1) 12 nautical miles for food wastes, except that, such food wastes may be discharged outside of 3 nautical miles from nearest land after they have been processed with a grinder or comminuter specified in § 151.75;
(1) Retained on board for later disposal ashore; or
(2)Discharged in accordance with the more stringent requirement prescribed by paragraphs (a) through (c) of this section.