meep:Troubled Water -- Known known: Medicine in the Water. Known unknown: Bad for You?And like
Though surveys have detected over 80 pharmacological compounds in US waterways--including painkillers, blood-pressure and heart medications, birth control pills, anti-fungal agents, Prozac, Viagra, anti-seizure medications, steroids, nicotine byproducts and antibiotics—whether this actually means anything is a mystery. "Little is definitively known," says the EPA, "regarding any real hazard posed by trace concentrations."
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meep says, there's pretty much nothing that can be done about it since it's the usual "going through the human body" process that brings it into the water. 