PharmWat2017 is international multidisciplinary conference aiming at discussing the comprehensive issue of occurrence of pharmaceutical residues in the water environment. This is done by considering the entire pathway of pharmaceutical residues from their source (human use of medicines, agriculture, etc.) as sewage water to waste water treatment plants releasing their effluent to surface waters and groundwater, this water being used as source for drinking water production, ending up with drinking water that may contain pharmaceutical residues. The effect of pharmaceuticals on plant and animal life in aquatic ecosystems is also considered. The diagramme illustrates the pathway and its key elements.