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

Looking for ways to celebrate Earth Day on or around the Sound? Check out our calendar of events!

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 Understanding Long Island Sound’s New Hypoxia Forecast Model
image for After 35 Years Dedicated to Long Island Sound, Mark Tedesco Retires as Director of EPA LIS Office
image for A New Decade of Conservation and Management in Long Island Sound
image for Celebrating Sustainability on the Sound - CT
image for Ansonia Nature Center Earth Day Celebration - CT
image for Celebrate Earth Day Hike - NYC
image for Sound Matters Winter/Spring 2025
image for Sound Matters Winter 2024 Issue II
image for Sound Matters Summer 2024 Issue
image for After 35 Years Dedicated to Long Island Sound, Mark Tedesco Retires as Director of EPA LIS Office
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
Sound Spotlight

Multi-Year Pilot Study on Long Island Explores Use of Sugar Kelp as a Fertilizer Amendment

Researchers and agriculture specialists are setting out to determine if sugar kelp, farmed for bioextraction, can be used as a fertilizer amendment for use by agricultural growers

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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

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Eelgrass Mapping and Monitoring

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