Toxic Contaminants

Industrial Chemical Discharges (TRI data – CT and NY)

July 30, 2010 — This indicator compiles the total amount of discharges of toxic chemicals manufactured and used at industrial facilities that are released into the Sound either by air or by water. Read More

Wastewater Treatment Plants Meeting Toxicity Standards

July 29, 2010 — Aquatic organisms are exposed to effluent from wastewater treatment facilities as a test for effluent toxicity. This indicator is the percentage of facilities in CT passing these tests. Read More

Contaminant Trends in Mussel Watch Sites

July 28, 2010 — Mussels tend to stay in one location and feed by filtering particles out of the surrounding water. They can accumulate local contaminants such as metals and PCBs in their tissues. Measuring levels of contaminants in their tissue is a good indicator of local contamination. Read More

Sediment Quality Index

July 27, 2010 — This index indicates the extent and severity of contaminants such as PCBs, hydrocarbons, metals, and pesticides in seafloor sediments throughout Long Island Sound. Read More

Heavy Metals in Sediment

July 26, 2010 — Sediment cores were sampled near Norwalk Harbor to determine the historic trends of toxic contamination in the seafloor sediment of the Sound. The cores give a record of metal contamination from the pre-colonial period to the post-industrial era. Read More

Lead Concentrations in Sediment by Basin

July 25, 2010 — This map shows the concentration of the heavy metal lead within the seafloor sediments throughout Long Island Sound. Read More

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