Testing has revealed that more Americans than previously thought are affected by trace amounts of pharmaceuticals in drinking water supplies. At least 46 million have been exposed -- that's up from the 41 million people reported by an investigation in March.
That investigation prompted federal and local legislative hearings, brought about calls for mandatory testing and disclosure, and led officials in at least 27 additional metropolitan areas to analyze their drinking water. Positive tests have been reported in areas including Reno, NV, Savannah, GA, Colorado Springs, CO, and Huntsville, AL.
The overwhelming majority of U.S. cities have not tested their drinking water.