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Great Lakes Areas of Concern are designated geographic areas within the Great Lakes Basin that show severe environmental degradation. There are a total of forty-three areas of concern within the Great Lakesmarker, the majority of twenty-six being in the U.S.marker, seventeen in Canadamarker and five are shared by the two countries.

The Great Lakes are the largest system of fresh water lakes in the world and are shared by the United States and Canada. The Great Lakes make up 95% of the surface freshwater in the contiguous United States and have 10,000 miles of coastline (including connecting channels, mainland and islands) --more than the contiguous United States' Pacific and Atlantic coastlines combined. The lakes are a system of transport and shipping, as well as a place of recreation. Traffic on and around the lakes is currently threatening the lakes' ecological stability.

Description of an AOC

An Area of Concern must have at least "one beneficial use impairment which means that it has undergone a change in its chemical, physical, or biological integrity of a water body." These include:
  • restrictions on fish and wildlife consumption
  • tainting of fish and wildlife flavor
  • degradation of fish and wildlife populations
  • fish tumors or other deformities
  • bird or animal deformities or reproduction problems
  • degradation of benthos
  • restrictions on dredging activities
  • eutrophication or undesirable algae
  • drinking water restrictions, or taste and odor problems
  • beach closings
  • degradation of aesthetics
  • added costs to agriculture or industry
  • degradation of phytoplankton and zooplankton
  • loss of fish and wildlife habitat

The Great Lakes Water Quality Agreement

The Great Lakes Water Quality Agreement between the United States and Canada more specifically defines Areas of Concern as "geographic areas that fail to meet the general or specific objectives of the agreement where such failure has caused or is likely to cause impairment of beneficial use of the area's ability to support aquatic life." The U.S.-Canada Water Quality Agreement holds the committee and regulations that decide whether an area should be considered an Area of Concern. The goal of the agreement is to restore and maintain the chemical, physical and biological integrity of the Great Lakes Basin ecosystem through a concerted set of interventions that are targeted at the aforementioned Areas of Concern. Because each waterway has a unique set of characteristics that have contributed to its ecological impairment, a Remedial Action Plan has been developed to identify the causes of impairment which will be used to guide local actions that will restore the individual waterways. The goal of each Remedial Action Plan is to bring about the delisting of the waterway from the list of Areas of Concern

Other laws and policies

The United States and Canada and the states that border the Great Lakes have all created several laws, policies, and commissions to try to keep the Great Lakes healthy and un-polluted. In 1909 the Boundary Waters Treaty was put into place to control the water quality in the Boundary Waters that border both the U.S. and Canada. They created the International Joint Commission to deal with the duties of the new treaty. With the realization of the sea lamprey explosion in the Great Lakes, the Great Lakes Fishery Commission was created to control the situation. In 1994 the Ecosystem Charter for the Great Lakes- St. Lawrence Basin was suggested as a good faith agreement. This was an agreement to use the ecosystem as a method of management for the Great Lakes. The Air Quality Agreement was put into place to help protect the health of not only the ecosystems of the Great Lakes but the citizens who live around them as well. It limits the amount of toxic chemicals that are given off. Another policy that was put into place in response to the toxic chemicals in the area of the Great Lakes occurred in 1997. The Great Lakes Binational Toxics Strategy was developed to control the persistent toxic substances that bioaccumulate such as DDT, PCBs, mercury and dioxins. These toxins stay in ecosystems for long after they are exposed and they can cause serious damage to the plant and animal life."


Invasive species

One of the major problems is the number of non-native species that are taking over the lakes. Every eight months a new species enters the Great Lakes, severely disrupting the ecosystems in the area. New animals or insects coming into an ecosystem can be just as damaging as pollution, as well as, a species leaving an area.

A major food source for most fish in Lake Michigan had been Diporeia shrimp that have been drastically decreased by an infestation of zebra mussels. The Diporeia shrimp have declined from over 10,000 per square meter to virtually zero on the lake bottom because of these zebra mussels. In Lake Michiganmarker the decrease in Diporeia numbers is extreme at 94% killed over the past ten years. Its neighbor, Lake Huronmarker is down 57% in its Diporeia population in just the past three years. There are many examples of this problem in each of the Great Lakes, as well.

Point-source pollution

Point-source pollution occurs when pollutants enter a waterway directly. This could be from such causes as waste being dumped into a waterway. In the past, lakes and other waterways were used as a place to dump waste because it was thought that water could dilute anything, whereas more recent studies have shown this to be extremely incorrect. After several hundreds of years of constant dumping, many waterways have become contaminated with toxic chemicals and human waste.

Nonpoint-source pollution

Nonpoint source pollution is pollution that occurs when runoff from streets, lawns, and other areas nearby a waterway carries toxins, chemicals, and silt into lakes, rivers, and oceans causing pollution and buildup of sediment. Nonpoint source pollution is said to be the most problematic and hardest to reverse of the types of pollution because it is so hard to regulate and pinpoint where it originates. Many experts agree that nonpoint source pollution is the biggest concern facing the Great Lakes. With the increase of urbanization, a toll has been taken on the lakes in these areas. Lakes that once had stable ecosystems with the appropriate amount of plant life are now full of massive amounts of plants and algae that have been fed by local lawns with their fertilizers, killing off many species of fish and other water life.

Atmospheric pollution

Atmospheric pollution is pollution that falls from the sky and comes to rest back on earth in the water table and in the lakes and oceans. This air pollution usually comes from smoke and chemicals being thrown into the air from smoke stacks and hospitals. One of the most troubling facts about atmospheric pollution is that it usually falls hundreds of miles away from its source and therefore is difficult to track and locate, but it is a major contributor to the pollution of not only the Great Lakes but all over the world. Pollution from one country can be hurting another. The most well known type of atmospheric pollution is acid rain. One of the biggest contributors to acid rain is the burning of coal and fossil fuels.

List of AOCs

Lake Superiormarker

Lake Eriemarker
  Lake Michiganmarker

Lake Huronmarker
  Lake Ontariomarker

Connecting channels



  • Buchsbaum, Andy. "Subcommittee on Water Resources and the Environment - The Impact of Aquatic Invasive Species on the Great Lakes". House Transportation and Infrastructure Committee. Apr. 2007. />.
  • "Pollution". Great Lakes Information Network. Apr. 2007. /
  • "What Can You Do?". Water Pollution Guide. Apr. 2007. />.

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