The increasing presence of organic micropollutants in different segments of the water cycle threatens future water resources. These micropollutants are currently being detected at low concentrations in groundwater and surface water used for drinking water intake. While current monitoring (chemical analyses) gives an indication of the presence of these micropollutants, little is known about the natural attenuation of micropollutants under in situ conditions.  This information is required to assess and mitigate the risks of contamination of drinking water resources. The aim of this research is to develop tools to assess microbial biodegradation capacity and activity.