The waters of the Long Island Sound have been tested for years for pollution, but the bays and harbors closest to the shores have been going unnoticed - until now.

Environmental group Save The Sound went out along the shores of Long Island Sound in Mamaroneck Monday launching a groundbreaking program that will test the waters closest to shore for pollution.

"We're collecting data that can then be used by the DEC in New York state and the DEP in Connecticut and elsewhere to decide what are the priority areas, where are the pollution problems stressing bays and harbors the most,” says Tracy Brown, Save The Sound’s director.

Save The Sound will look at two dozen bays and harbors around the Sound to test for pollution in the water. It will specifically look for nitrogen pollution, which it says has had a destructive impact on plant life and fish die-offs in recent years.

The group says Mamaroneck's water treatment plant, which produces nitrogen, is located inside Harbor Island Park, right next to the marina. However, it says the plant recently installed nitrogen reduction technology, which has helped stem the tide on nitrogen pollution in the Sound.