Photos of the Long Island Sound

Research & Monitoring

Status and Trends: LISS Environmental Indicators

Toxic Contaminants

Wastewater Treatment Plants Meeting Toxicity Standards

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. View Indicator

Industrial Chemical Discharges (TRI data – CT, NY and Upper watershed)

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. View Indicator

Sediment Quality Index

This index indicates the extent and severity of contaminants such as PCBs, hydrocarbons, metals, and pesticides in seafloor sediments throughout Long Island Sound. View Indicator

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