Dr Abhijit Mukherjee has made interdisciplinary, field, laboratory and numerical based studies to understand the decadal scale changes in groundwater quantity and quality in India. This work of social relevance quantified geological and human influences on groundwater chemistry, elucidated manmade and geogenic groundwater pollutants and measured groundwater-sea water interactions across India. He has also provided estimates on groundwater sourced drinking water availability across India and his studies have informed national water missions and policies.