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Radon and heavy metals are sources of groundwater pollution and are identified as potential carcinogens. Southwest Nigeria's populace mostly relies on groundwater source for drinking. This study aims to map radon distribution in groundwater of southwest Nigeria and to determine the health risk of radon and heavy metal in drinking water. Radon concentrations of 145 groundwater samples were measured using RAD7 electronic radon detector and heavy metal concentrations of 52 groundwater samples were measured using atomic absorption spectrophotometer. Radon concentration distributions were delineated using geographical information system. Radon concentration of water samples ranges between 1.6 Bq l⁻¹ and 271 Bq l⁻¹ with an average value of 35.9 ± 38.4 Bq l⁻¹. The average groundwater radon concentration is higher than US-EPA recommended level of 11.1 Bq l⁻¹ but lower than the WHO recommended …