Clean Waters and
Healthy Watersheds

Improve water quality by reducing contaminant and nutrient loads
from the land and the waters impacting Long Island Sound.

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A woman kayaks in the Black Hall River near the mouth of the Connecticut River in Old Lyme, Connecticut. Credit: Jerry Monkman/Ecophotography

Thriving Habitats
and Abundant Wildlife

Restore and protect the Sound’s ecological balance in a healthy, productive, and resilient state to benefit both people and the natural environment.

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Harp seal resting on beach in Madison, CT, waving flipper to warm itself in winter.

Sustainable and
Resilient Communities

Support vibrant, informed, and engaged communities
that use, appreciate, and help protect Long Island Sound.

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The mouth of the Saugatuck River in Westport, CT.

Sound Science and
Inclusive Management

Manage Long Island Sound using sound science and cross-jurisdictional
governance that is inclusive, adaptive, innovative, and accountable.

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UConn Professor Beth Lawrence collects data on surface water salinity with student Madeline Kollegger at a Barn Island tidal marsh. Photo by Emily Couture (CAHNR)/UConn.

The plan that guides Long Island Sound’s conservation is getting a major revision. Learn more.

The Long Island Sound Study (LISS) is a cooperative effort involving researchers, regulators, user groups and other concerned organizations and individuals. These people are working together to protect and improve the health of the Sound.

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Newsroom

image for Year in Review 2023
image for Long Island Sound Environmental Justice Needs Assessment Report
image for Sound Matters Spring 2024 Issue
image for Sustainable and Resilient Communities Extension Professionals Host Regional Funding Workshops in CT and NY
image for 2024 Long Island Sound Community Impact Fund Grant Slate
image for Restore America’s Estuaries Announces Long Island Sound Community Impact Fund Subawardees
image for Young Stewards Explore Science on Stamford’s Coast
image for Over $5.8 Million in BIL Funds Awarded to Port Washington Plant for Sewer System Improvements
image for Engagement Sessions to Give Public a Voice in Helping to Revise  Plan for Long Island Sound
image for Safeguarding Hempstead Harbor: A Story of Collaboration and Environmental Stewardship
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image for Nitrogen Coordination Work Group
image for Communications Outreach and Engagement Work Group
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image for Climate Change and Sentinel Monitoring Work Group
image for Habitat Restoration and Stewardship Work Group Meeting
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image for Nitrogen Coordination Work Group
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image for Sound Matters Winter 2023 Issue
image for Sound Matters Spring 2022 Issue
image for Year in Review 2021
image for Sound Matters Winter 2021-2022 Issue
image for Stuck Between a Rock and a Hard Place
image for Out on the water measuring the health of the Sound’s bays and harbors
image for Coastal Marsh Birds Live Life on the Edge, but Now Face Threat of Sea Level Rise
image for From Canoeing to Communications: A College Intern Tests the Waters in the Environmental Field
image for Recognizing Environmental Anniversaries and Accomplishments
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a lawn care message that was used in the 2018 pilot community based social marketing project in the Niantic river towns of East Waterford and Lyme, CT.
Sound Spotlight

Study on Residential Fertilizer Use Helps to Identify Nitrogen “Hot Spots”

Scientists use household lawn care survey with water quality models to better inform resource managers on where to focus campaigns to reduce nitrogen from lawn fertilizer

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Long Island Sound
By The Numbers

1,320
Square Miles

Area of the Long Island Sound

63
Feet

Average Depth

18 trillion
Gallons

Water Volume

600
Miles

Length of Coastline

23M+
People

Population Living Within 50 miles

$9.4B
Dollars (2015)

Estimated Value to the Local Economy Per Year

120+
Finfish

No. of Finfish Species Found in the Sound

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Monitoring Water Quality on Long Island Sound with CT DEEP

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