Occurrence and spatial distribution of organic micro-pollutants in a complex hydrogeological karst system during low flow and high flow periods, results of a two-year study

► Fifty-four micro-pollutants are studied in a large and complex aquifer system. ► Forty-four organic compounds are detected in groundwater. ► Most frequently detected are triazoles and triazines. ► Comparison of prescribed doses with detection frequency refers to persistence. ► First reported detection of tamoxifen in a fractured karstified aquifer.