Risk assessment of a mixture of emerging contaminants in surface water in a highly urbanized area in Italy.

•The occurrence of selected contaminats was investigated in a highly urbanized area.•The environmental risk assessment was assessed for the entire mixture.•Emerging contaminats were ubiquitous pollutants in the urbanized area.•A panel of substances of environmental concern was identified in any sampling point.•The mixture showed a potential risk also for pollutants that individually were safe.