According to the Associated Press:

“A vast array of pharmaceuticals — including antibiotics, anti-convulsants, mood stabilizers and sex hormones — have been found in the drinking water supplies of at least 41 million Americans. The concentrations of these pharmaceuticals are tiny, far below the levels of a medical dose but the long-term consequences to human health are unknown.”

CNN has a map of the affected metro areas and a video explanation of how drugs end up in tap water.

The