Photos of the Long Island Sound

Research & Monitoring


The Long Island Sound Study has launched a new version of the Environmental Indicators section. The data below may be out of date. Please visit and bookmark the new section here to see the most recent data.

Status and Trends: LISS Environmental Indicators


Watershed Management

Watershed restoration strategies are effective ways to support vibrant and healthy aquatic life, and to minimize the negative effects of erosion, sedimentation, and flooding. This map tracks progress by Connecticut and New York towards a goal of having 50 percent of their respective areas in the watershed developing or implementing watershed restoration strategies. View Indicator

Open Space

This indicator tracks efforts by the state governments of Connecticut and New York to preserve open space through purchases of, or easements on, local properties. View Indicator

River Miles Restored

In 2006, the Long Island Sound Study adopted a goal of restoring 143 miles of riverine migratory corridors for anadromous fish by the year 2011. This indicator tracks management progress towards achievement of this goal. View Indicator

Coastal Habitat Acres Restored

In 1998, the Long Island Sound Study adopted a goal of restoring 2000 acres of coastal habitats, including dunes, tidal wetlands, forests, salt marsh wetlands, and submerged aquatic vegetation. This indicator tracks management progress towards achievement of the goal. View Indicator

Atlantic Salmon Restoration in the CT River System

This indicator is the abundance of Atlantic salmon counted at observation stations in the Connecticut River. View Indicator

Herring Runs at Streams with Upstream Planned Fishway Projects

These counts indicate progress in expanding upstream habitat as fishway projects are completed. View Indicator

Coastal Cleanups

This measure indicates the efforts of volunteers to clean debris deposited on Long Island Sound beaches. View Indicator

NYC Boom and Skim Collection

This measure indicates the effort to collect floatable debris in western Long Island Sound. View Indicator

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

LIS Point Source Nitrogen-Trade Equalized Loads

This measure indicates the management effort to reduce nitrogen from wastewater treatment plants in order to meet state and federal water quality standards. View Indicator

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