Wittingly and not, we flush more chemicals down the toilet than anyone at the EPA can count, let alone regulate. But at least they have a name for them: Pharmaceuticals and Personal Care as Pollutants (PPCP). They come from the lotions and cosmetics we use, the drugs we take, and the hormones our livestock are fed. They make their way into streams, and, as endocrine disruptors, they do strange things to fish, like endow males with feminine characteristics. Now, nobody's managed to prove that the PPCPs that make it back into our bodies through drinking water affect our health, but some scientists think it's only a matter of time.
Source: "Something in the Water is Feminizing Male Fish. Are We Next?" Popular Science