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Radon in the household water collected from hand pumps is measured using a continuous radon monitor. Water samples are collected from 25 villages from the surrounding regions of the National Capital Power Cooperation (NTPC), Dadri. The radon concentration ranges from 17±1 to 68±3 Bql−1 with a mean value of 33±13 Bql−1. The measured radon concentration in all collected samples lies well within the limit of 100 Bql−1as set by the World Health Organization (WHO). The mean values of the annual effective dose due to ingestion of radon and due to the inhalation of radon released from water are 84±33 and 167±65 μSvy−1, respectively. In addition, the mean values of estimated total annual effective doses are found to be 167±65 μSvy−1. The mean value of total annual effective doses is found to be higher than the reference dose level of 100 μSvy−1 recommended by the WHO and the United Nations Scientific Committee on the Effect of Atomic Radiation (UNSCEAR). The mean values of effective doses per annum to the lungs and stomach are 9.9±3.9 and 10.1±3.9 μSv, respectively.

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