Estrogen receptor mediated activity in bankside groundwater, with flood suspended particulate matter and floodplain soil - An approach combining tracer substance, bioassay and target analysis

► First-time investigation of flood impact on groundwater/drinking water resources. ► Tracer substance analysis marked deep infiltration of flood water into groundwater. ► Detection of estrogenic activity supported this finding. ► High relevance for drinking water supply safety and groundwater protection. ► Indicates further focuses to reach aims of European Water Framework Directive.