Undated (AP) Trace amounts of pharmaceutical drugs have been detected in the drinking water supplies of two dozen major metropolitan areas nationwide.
An Associated Press investigation shows at least 41 million Americans are affected by the discovery.
The drugs include antibiotics, anti-convulsants, mood stabilizers and sex hormones, as well as over-the-counter pain medicines.
The concentrations are tiny, measured in quantities of parts per billion or trillion. That's far below the levels of a medical dose.
But some scientists are worried about the long-term consequences to human health