Niantic is a census-designated place (CDP) and village in the Town of East Lyme, Connecticut in the United States. The population was 3,085 at the 2000 census. Located on Long Island Sound, Niantic Bay is popular for swimming, fishing and boating. Wednesday evenings and Sunday afternoons, the Niantic Bay Yacht Club organizes sailboat races and the Bay is filled with sailboats. The Millstone Nuclear Power Plant in nearby Waterford is visible on the bay's eastern horizon line.