"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," an Associated Press investigation shows. Water in 24 metropolitan areas, including Detroit, Louisville, southern California and Northern New Jersey is particularly at risk. The report says the concentrations of these pharmaceuticals are "tiny." But it also points out that "the presence of so many prescription drugs - and over-the-counter medicines like acetaminophen and ibuprofen - in so much of our drinking water is heightening worries among scientists of long-term consequences to human health." Those consequences could include reproductive irregularities, the early onset of puberty, and increasing resistance to antibiotics.