The act that gave the Environmental Protect Agency the power to be tougher on water pollution was passed by Congress in 1972. Since then the CWA has done a lot to clean up U.S. waterways, though experts still say there is more to do.

For more information visit: http://www.huffingtonpost.com/2012/09/11/clean-water-act-2012_n_1874980.html?ref=topbar