U.S. Chemical Safety Board

As we've recently seen in West Virginia, chemicals seem to have a knack for escaping from their containers and wreaking havoc on the environment.  When that sort of thing happens, who investigates?  In addition to agencies like the Environmental Protection Agency and the Occupational Safety and Health Administration, there's an independent agency called the U.S. Chemical Safety Board that leaps into action: 

http://www.csb.gov/

Their site tells you not only about their mission and the incidents they're investigating, it also has a running list of chemical accidents in the news.  It's a frighteningly long list.