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Polluted sediment from harbor, river and waterway dredging has been dumped in four sites in the Sound. A dumping site near Stamford, Connecticut and another near New Haven, Connecticut were expected to remain open.

In 2007, the U.S. EPA and U.S. Army Corps of Engineers began a five- to seven-year, $16 million study on more sustainable methods to dredge harbors in the Sound.