`` Some of the filter results show levels slightly higher than those found by EPA monitors last week and a Department of Energy monitor the week before , '' the agency said . A growing number of U.S. states are affected , but none at levels that threaten public health . At least 20 states report mercury contamination in food or water or both . ` ` The levels detected are far below levels of public health concern , '' EPA says .
A growing number of U.S. states are affected , but none at levels that threaten public health . At least 20 states report mercury contamination in food or water or both . ` ` The levels detected are far below levels of public health concern , '' EPA says .