33 CFR § 401.59 - Pollution.
(a) No vessel shall:
(1) Emit sparks or excessive smoke; or
(2) Blow boiler tubes.
(b) No vessel shall discharge into Seaway waters any substance not in conformity with applicable United States Federal Regulations and Canadian Regulations with the exception of the waters of the Welland Canal where two specific zones are established in which no substances shall be discharged, namely,
(1) From Lock 7 (Thorold) to mile 17 (Welland); and
(2) From Lock 8 (Port Colborne) to the outer Port Colborne Piers (Lake Erie).
(c) A record shall be kept by the vessel of each location within the Seaway or adjacent waters where bilge water has been discharged.