Human being are excreting the drugs they ingest, and the drugs are ending up in fish and drinking water. The drugs include birth control pills, cholesterol lowering drugs, blood pressure medicine, and more. In the first nationwide study of human drugs found in fish tissue, fish caught and tested that were swimming near five large cities showed significant contamination, and has drawn the attention of the Environmental Protection Agency. In other studies, The Associated Press has reported that trace concentrations of pharmaceuticals have been detected in drinking water provided to at least 46 million Americans.
What to do? Filter your water. Municipal water treatment plants are usually not equipped to filter out pharmaceuticals. For those on municipal water systems, a whole-house charcoal-based water filter will filter even tap water for brushing teeth.