More than half of south Asia’s groundwater too contaminated to use – study
Salinity and arsenic affect 60% of underground supply across vast Indo-Gangetic Basin, according to research published in Nature Geoscience. Sixty per cent of the groundwater in a river basin supporting more than 750 million people in Pakistan, India, Nepal and Bangladesh is not drinkable or usable for irrigation, researchers have said. The biggest threat to groundwater in the Indo-Gangetic Basin, named after the Indus and Ganges rivers, is not depletion but contamination, they reported in the journal Nature Geoscience. “The two main concerns are salinity and arsenic,” the authors of the study wrote. Up to a depth of 200m, some 23% of the groundwater stored in the basin is too salty, and about 37% “is affected by arsenic at toxic concentrations”, they said.
