Fecal Contamination of Shallow Tubewells in Bangladesh Inversely Related to Arsenic

Alexander Van Geen; Kazi Matin Ahmed; Yasuyuki Akita; Md. Jahangir Alam; Patricia J. Culligan; Michael Emch; Veronica Escamilla; John Feighery; Andrew S. Ferguson; Peter Knappett; Alice C. Layton; Brian J. Mailloux; Larry D. McKay; Jacob L. Mey IV; Marc L. Serre; P. Kim Streatfield; Jianyong Wu; Mohammad Yunus

Fecal Contamination of Shallow Tubewells in Bangladesh Inversely Related to Arsenic
Van Geen, Alexander
Ahmed, Kazi Matin
Akita, Yasuyuki
Alam, Md. Jahangir
Culligan, Patricia J.
Emch, Michael
Escamilla, Veronica
Feighery, John
Ferguson, Andrew S.
Knappett, Peter
Layton, Alice C.
Mailloux, Brian J.
McKay, Larry D.
Mey IV, Jacob L.
Serre, Marc L.
Streatfield, P. Kim
Wu, Jianyong
Yunus, Mohammad
Civil Engineering and Engineering Mechanics
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Environmental Science & Technology
Reprinted with permission from Environmental Science & Technology. Copyright 2011 American Chemical Society.
The health risks of As exposure due to the installation of millions of shallow tubewells in the Bengal Basin are known, but fecal contamination of shallow aquifers has not systematically been examined. This could be a source of concern in densely populated areas with poor sanitation because the hydraulic travel time from surface water bodies to shallow wells that are low in As was previously shown to be considerably shorter than for shallow wells that are high in As. In this study, 125 tubewells 6-36 m deep were sampled in duplicate for 18 months to quantify the presence of the fecal indicator Escherichia coli. On any given month, E. coli was detected at levels exceeding 1 most probable number per 100 mL in 19-64% of all shallow tubewells, with a higher proportion typically following periods of heavy rainfall. The frequency of E. coli detection averaged over a year was found to increase with population surrounding a well and decrease with the As content of a well, most likely because of downward transport of E. coli associated with local recharge. The health implications of higher fecal contamination of shallow tubewells, to which millions of households in Bangladesh have switched in order to reduce their exposure to As, need to be evaluated.
Environmental sciences
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Alexander Van Geen, Kazi Matin Ahmed, Yasuyuki Akita, Md. Jahangir Alam, Patricia J. Culligan, Michael Emch, Veronica Escamilla, John Feighery, Andrew S. Ferguson, Peter Knappett, Alice C. Layton, Brian J. Mailloux, Larry D. McKay, Jacob L. Mey IV, Marc L. Serre, P. Kim Streatfield, Jianyong Wu, Mohammad Yunus, , Fecal Contamination of Shallow Tubewells in Bangladesh Inversely Related to Arsenic, Columbia University Academic Commons, .

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