Why do you think nuclear contamination was not listed as a threat to America's rivers?

CNN: Rivers feel heat as U.S. energy demand rises

Two years ago, on March 14, 2011, the National Nuclear Security Administration sent flight crews to Japan to monitor airborne and ground contamination from the still developing nuclear crisis at the Fukushima-Daiichi nuclear plant.

FORBES: Drones To Be Deployed As Nuclear Fallout Detectors

Since the March 11 earthquake that ravaged northern Japan, workers at Fukushima Daiichi have been struggling to cool down three overheated reactors and keep pools of spent but still potent nuclear fuel from spreading further radioactive contamination across northern Japan.

CNN: STORY HIGHLIGHTS

But with the Fukushima nuclear disaster in 2011 rumors spread of radioactive contamination of many Japanese products.

FORBES: Chinese Mothers Risk Arrest For Buying Safe Baby Formula

The latest revelation is likely to stoke fears among consumers already on edge about the safety of the nation's food supply since the March 11 Fukushima Daiichi nuclear accident, following reports over the summer of beef contamination and, more recently, some instances of tainted rice.

WSJ: Radioactive Traces Found in Japan Baby Formula

Ultimately, the impact of this work will be to influence policy in order to treat heavy metal contamination and to optimise management policy for arsenic and nuclear legacy materials.

UNESCO: 2011 UK and Ireland Winners

When inspectors found suspicious nuclear material at this site, the Iranians said it was just contamination.

BBC