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Radiation exposure and heavy metal (HM) exposure are serious health hazards causing DNA mutation, oxidative damage and may also be responsible for various life-threatening human diseases, while bacteria can withstand such toxicity easily. This study attempted to identify inhabitant bacterial isolates from radon-contaminated groundwater of Tantloi, India, and effort has also been made to characterize their response against radiation, oxidative stress as well as heavy metal tolerance and removal. Total sixteen (16) bacterial isolates were identified as Bacillus spp., Stenotrophomonas spp., Brevibacillus sp., Chryseobacterium sp., Escherichia sp. and Microbacterium sp., which showed less number of distinct carbohydrates utilization potential but high salinity tolerance properties. In addition, Gram-positive Bacillus spp. can tolerate 1 kGy of γ radiation, 10 mM H₂O₂, 7 days of desiccation and different heavy …