The Long Island Sound Watershed Intermunicipal Council (LISWIC) was originally founded in 1998 when a group of local municipal officials saw the potential benefits of working together to achieve common goals. Over the years, LISWIC's activity level has ebbed and flowed, and most recently was revitalized in 2026 with a renewed intermunicipal agreement, demonstrating each participating municipalities commitment to a cleaner Long Island Sound and effective stormwater management.
City of Mount Vernon
City of New Rochelle
City of Rye
Town of Mamaroneck
Town of Pelham
Town of Rye
Town/Village of Harrison
Village of Larchmont
Village of Mamaroneck
Village of Pelham
Village of Pelham Manor
Village of Port Chester
Village of Rye Brook
Village of Scarsdale
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