Online poll among European Geological Survey Organisations summarises activities in the field of 3D geological modelling and reveals the current state of progress   An online survey was carried out across federal and state geological surveys of Europe between December 2014 and February 2015 to reveal the current state of progress in 3D geological modelling as well as the financial and human resources involved in geological modelling activities. Thirty-six institutions responded to the questionnaire leading to an almost complete coverage of European countries. Results show that 3D geological modelling at geological surveys really took off between 2001 and 2010 and by now, more than half of the participating countries have covered at least 20% of their area with regional scale geological models. In 2014, most survey organisations spent up to 50,000€ on 3D modelling. On average 60% of the total modelling budget are spent on modelling per se, while 10% go to software licence fees, 10% to programming and 20% to model dissemination.   Virtually all Geological Survey Organisations in Europe perform 3D geological modelling as part of research projects related to groundwater, mineral resources or geothermal energy. As to the systematic 3D mapping of the subsurface, ten countries / states in Europe stipulate 3D geological models by legal mandate. Only in four of those, there also are legal requirements to follow national standards for 3D data models. While most geological surveys carry out geological modelling by employing their own staff, some have outsourced the task to research institutes and/or universities. Although some modelling activities were undertaken already in the eighties and nineties, the majority of geological survey organisations started 3D geological modelling between 2001 and 2010. Up until now they spent up to ten person-years on modelling. By the end of 2014,...