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About St. Lawrence River AOC

St. Lawrence River AOC Boundary MapSt. Lawrence River AOC Boundary Map

The St. Lawrence River at Massena begins above the power dam facilities and seaway locks at the Massena Village drinking water intake. It follows the river downstream for about fifteen miles to the international border. In 1987 the St. Lawrence River was designated an AOC as part of the Great Lakes Water Quality Agreement of 1987.

The area was considered highly degraded because of:

non-point sourceSource of pollution in which wastes are not released at one specific, identifiable point but from a number of points that are spread out and difficult to identifThe AOC includes portions of the Grasse, Raquette and St. Regis Rivers in New York State. The United States, Canada and the St. Regis Mohawk Tribe at Akwesasne share authority for the AOC.

Beneficial Use Impairments

  • Restrictions on fish and wildlife consumption
  • Loss of fish and wildlife habitat
  • Degradation of fish and wildlife populations (likely impaired)
  • Fish tumors or other deformities (likely impaired)
  • Bird or animal deformities or reproduction problems (likely impaired)
  • Degradation of benthos (likely impaired)
  • Degradation of phytoplankton and zooplankton populations (likely impaired) – REMOVED 2015

Learn more about BUIs Exit

Restoring the St. Lawrence River AOC (timeline)