Thunder Bay: Area of Concern

Thunder Bay was designated an Area of Concern (AOC) in 1987 under the Canada-U.S. Great Lakes Water Quality Agreement. Years of contamination, primarily from the forest products industry, as well as from waste disposal, urbanization and changes to the watercourse led to the degraded water quality and environmental health. Ten out of 14 beneficial use impairments (BUIs) were identified, which measure the environmental, human health or economic impact of poor water quality. One additional beneficial use was deemed “requiring further assessment”, meaning more information was required to determine whether it was impaired.

Accomplishments

Over the past 30 years, there has been significant progress in restoring the water and environmental quality in Thunder Bay. This includes:

• implementing stricter regulations in the mid-1990s, which resulted in mill process changes, as well as upgrades to municipal wastewater treatment
• the development and implementation of the City of Thunder Bay’s Stormwater Management Plan and several low impact design features in local waterways to address the effects of stormwater on water quality and fish habitat
• an investment of $20 million to complete the Northern Wood Preservers Alternative Remediation Concept (NOWPARC) project in 2003 to isolate 32,000 cubic meters of highly contaminated sediment and create five hectares of fish habitat
• the completion of habitat rehabilitation projects to create 1,700 square meters of fish spawning and nursery areas in the Current River estuary; aquatic habitat in five tributaries flowing into Thunder Bay; island habitat at the mouth of McVicar Creek; and 3 hectares of wetland in the nearshore of McKellar River 

Restoration of beneficial uses

Over the last decade, significant progress has been made to improve environmental conditions in the AOC. These beneficial uses are no longer considered “impaired”:

• added costs to agriculture or industry (2004)
• restrictions on dredging activities (2012)
• degradation of aesthetics (2019)
• fish tumours or other deformities (2019)
• bird or animal deformities or reproduction problems (2019)
• degradation of phytoplankton and zooplankton populations (2020)
• beach closings (2023)
• degradation of fish and wildlife populations (2025)

Work continues on restoring the remaining beneficial uses:

• degradation of benthos – monitoring and reporting is underway for two of the three focus areas involving contaminated sediment (the NOWPARC area and Kaministiquia River delta), and a best approach consultation continues for the third area (Thunder Bay North Harbour)
• loss of fish and wildlife habitat – studies show wetlands are healthy and fish habitats have improved due to the cleanup of contaminated sediment, improvements to water quality, and reconstruction of shorelines and spawning areas, while work is underway to create and restore riparian and coastal wildlife habitat
• restrictions on fish and wildlife consumption – wildlife consumption is not impaired and  data suggests positive improvements in fish contaminants with further assessment underway 

Recent actions

The overall health of Thunder Bay has improved through these recent actions:

• evaluation led by a multi-stakeholder working group on ways to manage contaminated sediment in Thunder Bay North Harbour
• review of the working group’s recommendations to inform next steps in project implementation 

Remaining actions

We will continue to work with local and provincial partners to support monitoring and assessment studies needed to confirm environmental quality objectives are met. Priorities are to:

• further enhance wildlife habitat, specifically near the water’s edge, by implementing restoration projects outlined in the wildlife habitat strategy
• select and develop an approach to manage contaminated sediment at Thunder Bay North Harbour

Outlook

The Thunder Bay AOC has seen significant progress towards restoration. Under the Canada-Ontario Agreement on Great Lakes Water Quality and Ecosystem Health, we will work with the province of Ontario to continue making progress towards remediation, environmental recovery and restoration of beneficial uses. 

Our partners

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

• City of Thunder Bay
• Confederation College
• EcoSuperior Environmental Programs
• Fort William First Nation
• Lakehead Region Conservation Authority
• Lakehead University
• Métis Nation of Ontario
• North Shore Steelhead Association
• Ontario Ministry of Natural Resources
• Ontario Ministry of the Environment, Conservation and Parks
• Red Sky Métis Independent Nation
• Thunder Bay District Environmental Stewardship Council
• Thunder Bay District Health Unit
• Thunder Bay Remedial Action Plan Public Advisory Committee
• Transport Canada

Related links

• Managing contaminated sediment
• InfoSuperior
• Northern Wood Preservers Alternative Remediation Concept
• Binational.net
• Funding for Great Lakes protection
• Canada-Ontario Agreement on Great Lakes Water Quality and Ecosystem Health