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'''Arsenic contamination of groundwater''' is a natural occurring high concentration of [[arsenic]] in deeper levels of [[groundwater]]. It is a high-profile problem due to the use of deep [[tubewell]]s tubewells for water supply in the [[Ganges Delta]], causing serious [[arsenic poisoning]] to large numbers of people. A 2007 study found that over 137 million people in more than 70 countries are probably affected by arsenic poisoning of drinking water. Arsenic contamination of ground water is found in many countries throughout the world, including the USA.<ref>{{cite journal
| title = A review of the source, behaviour and distribution of arsenic in natural waters
| author = Smedley PL, Kinniburgh DG