The Chesapeake Bay and Puget Sound are used as examples as a checkup of America's waterways. Both estuaries, chemicals contained in products we use everyday can be found, and are likely affecting marine life and humans. A USGS study of the Potomac river revealed mutations in frogs which can be linked chemicals to household items. And in Puget Sound, orca carcasses have been tested and contain high levels of PCB's.