" Reports of trace concentrations of pharmaceuticals in the water cycle have raised concerns amongst various stakeholders such as drinking-water regulators, governments, water suppliers and the public, over potential human health risks from exposure to very low levels of pharmaceuticals in drinking-water.
This technical report aims to provide practical guidance and recommendations in managing concerns over pharmaceuticals in drinking-water, taking into consideration the available scientific knowledge and evidence. It emphasizes the importance to prioritize this emerging issue in the overall context of water safety management, which includes microbial and other chemical risks that may threaten the safety of drinking-water."
"Most importantly, it is prudent to note that advanced and costly water
treatment technology will not be able to completely remove all micropollutants
to concentrations below the detection limits of the most sensitive analytical
procedures at all times. Therefore, it is imperative to consider the toxicological
relevance of various compounds in the context of appreciable risks to human
health. Increased or rapidly changing exposure arising from specific local
circumstances (e.g. a significant increase in the concentration of pharmaceuticals
in surface waters impacted by wastewater discharge) should be investigated. "
(page 21)
WHO | Pharmaceuticals in drinking-water
Some shit stays anyways, always. How big health hazard it forms, is another issue. Not big risk for humans based on that paper. Polluting environment is another matter.