<p>More than 20 percent of the nation’s water treatment systems have violated key provisions of the Safe Drinking Water Act over the last five years, according to a New York Times analysis of federal data. <a title="Article in full" href="http://www.nytimes.com/2009/12/08/business/energy-environment/08water.html?_r=1">More</a> (Source: New York Times)</p>