Identification of a safe and sustainable source of drinking water is still a global challenge, forcing a large population to continue depending on unsafe sources. The causes of such challenges include the spatial uncertainty in the occurrence of the possible contaminants and the tools used to characterize them during the data collection and analysis stage. The spatial uncertainty is a result of the variability of such contaminants which affects decision-making at various scales. In this webinar, Drs Julian Ijumulana (Tanzania) and Prosun Bhattacharya (Sweden) will present the holistic approach that integrates Quantum Geographic Information Systems (QGIS) and other GIS software and tools to handle the spatial uncertainty in the measured fluoride concentrations in drinking water. The case study considered in this webinar includes the three administrative regions in northern Tanzania within the East African Rift Valley (EARV).  You are all invited to listen to this webinar using the links provided.  The webinar is free of costs.