This in-depth investigation reaches into the far corners of America’s waterways and pulls out a wealth of disturbing information on the new wave of pollution that’s causing massive fish kills, mutating frogs and threatening human health. Interviews with environmental experts such as William Ruckelshaus, who was the first head of the newly formed EPA in 1970, provide valuable insight into the state of America’s oceans, rivers and streams. Best of all, you can watch it online for free, courtesy of PBS.