Beneficial Use Impairments

The St. Marys River was identified as an AOC because of impairment of 9 out of 14 beneficial uses defined by the Great Lakes Water Quality Agreement. The following is a summary of the impairments in the St. Marys River Area of Concern as per the Stage 2 RAP report (2002)

Beneficial Use Impairment

Status in Canada

Status in the U.S.

Restriction on Fish and Wildlife Consumption Impaired Impaired
Tainting of Fish and Wildlife Flavour

Never Impaired

Never Impaired
Degradation of Fish and Wildlife Populations
(a)    Dynamics of fish populations

Impaired

 Not Impaired (2019)
(b)    Dynamics of wildlife populations

RFA (Change to Not Impaired recommended)

 Not Impaired (2019)
Fish Tumours and Other Deformities

Impaired

 Impaired
Bird and Animal Deformities or Reproductive Problems

Not Impaired (2015)

 Not Impaired (2014)

Degradation of Benthos  Impaired  Impaired
Restriction on Dredging Activities

Impaired (Change to Not Impaired Recommended)

Not Impaired (2018)

Eutrophication and Undesirable Algae

Not Impaired (2018)

Not Impaired (2017)
Restrictions on Drinking Water Consumption or Taste and Odour Problems  Never Impaired  Never Impaired
Beach Closures

Not Impaired (2018)

 Not Impaired (2016)
Degradation of Aesthetics

Not Impaired (2018)

 Not Impaired (2014)
Added Cost to Agriculture and Industry

Never Impaired

 Never Impaired
Degradation of Phytoplankton and Zooplankton

Never Impaired

Never Impaired
Loss of Fish and Wildlife Habitat

Impaired

 Not Impaired (2019)