Over one-hundred million people in Bangladesh, India, Nepal, Pakistan, Cambodia, Vietnam, and Myanmar are drink dangerous concentrations of arsenic from wells. Our work is focused in Bangladesh where tens of millions of recently-installed wells provide drinking water for over 130 million people.

We combine hydrologic and biogeochemical analysis to elucidate processes that mobilize arsenic from sediments into groundwater. We have described how groundwater arsenic concentrations are controlled by natural geochemical processes, land-use changes, and groundwater pumping. We have studied the:

1. Patterns of groundwater flow and solute transport, and how these patterns changed after the advent of widespread pumping for irrigation.
2. Biogeochemical processes that control the mobility of arsenic in groundwater.
3. Effects of constructed ponds on groundwater chemistry.
4. Fate of arsenic applied to rice fields in irrigation water. 

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