Worrisome levels of nitrate in drinking water for 7 million Americans

Seven million Americans who live in small cities and towns have worrisome levels of nitrates in their drinking water — below the federal limit of 10 milligrams per liter, but high enough to be associated with cancer in some studies, said an Environmental Working Group official. Craig Cox, head of EWG's Midwest office, said 1,683 communities had nitrate levels above 5 milligrams per liter and, when plotted on a map, they "crazily lined up with intensive agriculture."