Water and Sediment

  • Temporal Changes in Toxic Contamination at the Carillon Sampling Station
    Deforestation, urban development, industrial activity and farming have generated heavy loads of toxic substances that have found their way into rivers and lakes over the last century. These inputs have contributed to degrading the water quality in the Ottawa River basin and have attendant impacts on the quality of the water and ecosystem of the St. Lawrence River.
  • Benthic Macroinvertebrate Communities
    An indicator of water quality and aquatic ecosystem health in the St. Lawrence River
  • Phosphorus at the Mouths of Lake Saint-Pierre Tributaries
    Between 2005 and 2014, the average concentrations of phosphorus measured at the mouths of the Saint-François and Nicolet rivers oscillated around values corresponding to a eutrophic environment. However, it was at the mouth of the Yamaska River that the highest concentrations were observed and where conditions were hypereutrophic.
  • Sediment Quality of the St. Lawrence River
    According to studies by Environment Canada, surface sediments in the St. Lawrence River are generally less contaminated than they were 20 years ago as a result of effluent treatment measures. Yet, concentrations of some substances have remained unchanged or are even increasing.
  • Drug Cocktail in the St-Lawrence River Offers No Relief to Aquatic Organisms
    At water quality monitoring stations along the St. Lawrence River, 17 pharmaceutical, and personal care products (PPCPs), and other substances were detected among the 30-odd contaminants analyzed in 2006.
  • Monitoring the Water Quality of the St. Lawrence River
    There are currently ten water quality sampling stations being operated in Quebec by Environment Canada. They serve to assess the level of water contamination by registering seasonal and interannual fluctuations as well as long-term trends in contaminant concentrations.
  • Pesticides are Entering the St-Lawrence River Through it's Tributaries
    A number of pesticides are present in the water of the St. Lawrence River near Quebec City and at the mouths of some tributaries of Lake Saint-Pierre. This is what scientists at Environment Canada have observed since 2003.
  • Tracking Polybrominated Diphenyl Ethers (PBDE): New Chemical Contaminants in the Environment
    Polybrominated diphenyl ethers, or PBDEs, are widely used in industry due to their flame-retardant properties.Although they are useful, these substances accumulate in the environment, including the St. Lawrence River, and questions are being raised about their potential impacts.

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