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Clay layers and distant pumping trigger arsenic contamination in Bangladesh ground water

May 13, 2020  By Earth Institute, Columbia University

Workers install a monitoring well near the study site in Bangladesh. Photo credit: Rajib Mozumder

A study published in Nature Communications suggests that such clay layers do not always protect against arsenic, and could even be a source of contamination in some water wells.

Clay layers had previously been suspected of contaminating ground water with arsenic in parts of Bangladesh, the Mekong delta of Vietnam and the Central Valley of California, but the new paper, “Arsenic contamination of Bangladesh aquifers exacerbated by clay layers,” provides the most direct evidence so far. | READ MORE


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