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Ground water quality in the Kathmandu valley of Nepal

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Abstract

A study was undertaken to assess the quality of groundwaters in the Kathmandu Valley, Nepal. The groundwater samples were randomly collected from shallow well, tube well, and deep-tube wells located at different places of Kathmandu, Lalitpur, and Bhaktapur districts in the Kathmandu valley. Physical, chemical, and microbiological parameters of the samples were evaluated to estimate the groundwater quality for drinking water. It was found that the groundwater in the valley is vulnerable to drink due to presence of iron and coliform bacteria. Iron was estimated to be much higher then the acceptable limit of World Health Organization (WHO) drinking-water quality guidelines (1.9 mg/L). Total coliform bacteria enumerated in groundwaters significantly exceeded the drinking-water quality standard and observed maximum coliform (267 CFU/100 mL) in shallow wells. The electrical conductivity and turbidity were found to be 875 μS/cm and 55 NTU, respectively, which are above the WHO recommendations for drinking water guidelines. However, pH value was measured within the acceptable limit. Arsenic, chloride, fluoride, and hardness concentrations were found to be in agreement with the recommendations of WHO drinking-water quality guidelines.

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Authors and Affiliations

  1. Nepal Academy of Science and Technology, G.P.O. Box 3323, Kathmandu, Nepal

    Bhoj Raj Pant

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  1. Bhoj Raj Pant
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Correspondence to Bhoj Raj Pant.

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Pant, B.R. Ground water quality in the Kathmandu valley of Nepal. Environ Monit Assess 178, 477–485 (2011). https://doi.org/10.1007/s10661-010-1706-y

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