In a widely reported study on Potomac River bass, male fish were found to have female ovarian tissue inside their testes. In another study, fish exposed to wastewater from a metropolitan area wastewater treatment plant showed endocrine disruption, meaning male fish produced female egg yolk proteins (pharmaceutical and personal care). To date, no studies directly link traces of chemicals in water to human health problems, but there are countless reasons for concern. Could exposure to these small amounts of drugs in our water cause drug resistance? Is it possible to unknowingly ingest a drug you are allergic to simply by drinking water? And how do these trace amounts of drugs, which may not be harmful to humans, affect a