Collingwood Harbour: Area of Concern (Delisted)

Collingwood Harbour was designated an Area of Concern (AOC) in 1987 under the Canada-U.S. Great Lakes Water Quality Agreement. A history of industrialization, urbanization and agricultural land use activities along its shores and tributaries contributed to the degraded environmental quality. Nine out of 14 beneficial use impairments (BUIs) were identified, which measure the environmental, human health or economic impact of poor water quality. An additional beneficial use was deemed “requiring further assessment”, meaning more information was required to determine whether it was impaired. 


In 1994, Collingwood Harbour became the first Canadian AOC to be delisted. We delist an AOC when monitoring shows that targets for all BUIs have been met and environmental quality has been restored.

Monitoring confirmed that environmental quality was restored through:  

Restoration of beneficial uses

All beneficial uses are no longer considered “impaired”. These included:

Our partners

On the Canadian side, we partner with other levels of government, non-government groups, Indigenous communities and members of the public. This restoration work required a large amount of scientific and technical expertise, local knowledge, hard work and the help of:

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