Water Matters: Safeguarding our Shores: Why Every Acre Matters on Long Island
June 17, 2026
By Matt Swain
On Long Island, our survival is inextricably linked to the invisible work of our estuaries and coastal ponds. These unique ecosystems—where our groundwater and streams meet the salt of the Atlantic—act as our island’s primary defense system. They are far more than scenic backdrops; they are the biological engines of our home, serving as nurseries for nearly 70% of the U.S. commercial fish catch and filtering billions of gallons of water every day. At the Peconic Land Trust, we recognize that protecting these waters isn't just about preserving a view. It is a functional necessity for a resilient future.
The Front Lines: Sagg and Georgica Ponds
Our coastal ponds, specifically Sagg Pond in Sagaponack and Georgica Pond in East Hampton, represent the front lines of our water quality efforts. These water bodies are vital "buffer strips" for the South Shore. During extreme weather, the salt marshes and maritime forests we protect around these ponds act as natural sponges, absorbing the energy of Atlantic storm surges and preventing floodwaters from rushing into our residential communities.
When we maintain natural shorelines instead of hardening them with bulkheads, we allow the landscape to dissipate wave energy safely. But the threat isn't just coming from the ocean; it’s coming from the land.
The Battle Against Nitrogen
Nitrogen pollution remains the single greatest threat to our local waters, fueling harmful algal blooms that deplete oxygen and devastate marine life. To combat this, we are studying nitrogen inputs and actively mitigating them by working with municipalities and private landowners. We also coordinate with our partners—CLEAR Bays, Cornell Cooperative Extension, the Stony Brook Center for Clean Water Technology, and Perfect Earth Project—to implement a range of strategies:
Watershed Preservation: By protecting land within the Georgica and Sagg Pond watersheds, we prevent new development and the resulting nitrogen-heavy septic systems from ever reaching the groundwater.
Innovative Filtration: We are deploying Permeable Reactive Barriers—underground woodchip filters—to cleanse nitrogen-heavy groundwater before it reaches the ponds.
Natural Restoration: We support initiatives to capture accumulated nutrients with vegetative buffers and restore native oyster populations, which naturally filter up to 50 gallons of water per day.
Collaborative Conservation Across the Region
Our work extends across the entire region through meaningful partnerships with the Peconic Baykeeper and the Peconic Estuary Partnership. Together, we are managing critical sites like our Broad Cove Preserve in Riverhead and Widow’s Hole Preserve in Greenport. Additionally, we are working with the USDA on key projects like the Forge River Preserve in Brookhaven to combat storm surges by implementing comprehensive floodplain restoration plans.
A Lesson in Connectivity
In our years of stewardship, we have learned a humbling lesson: you cannot "save" a piece of land by simply drawing a line around it. We have seen restoration projects struggle because they ignored the "ecological connectivity" between a marsh and the adjacent upland. True conservation requires looking beyond property lines. If we ignore the transition zones, the very habitats we seek to protect can succumb to a single severe storm. This insight drives our strategy to protect entire habitat corridors, ensuring that species and sediment can move naturally as our climate changes.
The Power of Private Support
There is a common misconception that our work is funded by the 2% Peconic Bay Region Community Preservation Fund (CPF) tax. This is not the case. While the CPF is a vital tool for land acquisition and water quality initiatives by our East End towns, the Peconic Land Trust depends on your private contributions to do its work. We raise private capital to save threatened parcels, to manage complex invasive species removals, and to engineer nitrogen-mitigation projects.
When you support the Trust, you aren't just "buying land"—you are investing in living infrastructure. You are funding the "Living Shorelines" that replace crumbling bulkheads with cordgrass and oyster reefs. You are securing the "supratidal" areas that allow marshes to migrate inland as sea levels rise.
Conservation is a collective act of foresight. Together, we can ensure that Long Island remains a productive, resilient home for both its wildlife and its people. Your support makes the difference between a coastline that erodes and one that endures.
For more information, contact Matt Swain, Vice President of Conservation & Stewardship, at 631.283.3195.
Matt Swain
Vice President
MSwain@peconiclandtrust.org