Aquifer mapping can be defined as a scientific process, where in a combination of geologic, geophysical, hydrologic and chemical analyses are applied to characterize the quantity, quality and sustainability of ground water in aquifers. Systematic aquifer mapping can improve our understanding of the geologic framework of aquifers, their hydrologic characteristics, water levels in the aquifers and how they change over time and the occurrence of natural and anthropogenic contaminants that affect the potability of ground water. Results of these studies will contribute significantly to resource management tools such as long-term aquifer monitoring networks and conceptual and quantitative regional ground-water-flow models used by planners, policy makers and other stake holders. Aquifer mapping at the appropriate scale can help to prepare, implement and monitor the efficacy of various management interventions aimed for long-term sustainability of our precious ground water resources, which in turn, will help to achieve drinking water security, improved irrigation facilities and sustainability in water resources development in the country as a whole. Various on-going activities of Central Ground Water Board, such as ground water monitoring, ground water resource assessment, artificial recharge and ground water exploration in drought, water scarcity and vulnerable areas can also be integrated in the aquifer mapping project.