"Participatory inventory of the Himalayan balsam within the Dyle basin since 2008" is an occurrence-only dataset serving as an assessment of the invasion on the rivers of the Dyle basin by Impatiens glandulifra . The majority of the data was collected between 2008 and 2010 in a participative way thanks to all the partners of Contrat Rivière Dyle-Gette (CRDG), the coordination of this large-scale inventory being ensured by the Coordination Unit at CRDG. Other data came of course to complete and specify this first inventory according to the multiple activities of the CRDG partnership and following the new detections made during the operations of management of the invasive alien species set up annually on the whole sub-basin since summer 2010.