DWA (German Association for Water Management, Waste Water and Waste): Vice-chair of the working group “Research and development” within the Sub-association for Hydrological Sciences

FH-DGG (Hydrogeology Section of the German Geological Society), working group “Groundwater quality”

EGU (European Geophysical Union), Committee on Catchment Hydrology

IAHS (International Association of Hydrological Sciences)

AGU (American Geophysical Union)

LTER-D (Long-Term Ecological Research, Germany)

DBG (German Soil Science Society)

VGöD (Association for Geoecology in Germany)