Analysis of substances in surface water sediments are carried out once a year at a selection of monitoring stations of the international hydrographical district of the river Rhine. Chemicals analysed include specific pollutants, priority substances and priority hazardous substances that have a tendency to accumulate in sediments in accordance with the Water Framework Directive (2000/60/EC) and the Environmental Quality Standards Directive (2008/105/EC).

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Anyone who finds errors or faults is invited to report them to the Water Management Agency.