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Radon (222Rn) is a naturally occurring radioactive gas that represents a significant source of internal exposure to ionizing radiation. In regions where groundwater is used for human consumption, radon dissolved in well water may contribute to ingestion dose and indoor air contamination. This study aimed to evaluate radon concentrations in well water, rocks, and soil samples collected in the rural area of Carambeí, Paraná, Brazil. Water and rock samples were collected from properties supplied by artesian wells. Soil radon concentration was measured in situ. Radon activity in water was determined using alpha spectrometry techniques, and 226Ra activity was also evaluated. Rock samples were analyzed to assess radon exhalation potential. Radon concentrations in well water ranged from 0.4 ± 0.8 Bq/L to 87 ± 13 Bq/L. Approximately 81% of the samples exceeded 0.5 Bq/L, the reference value for gross alpha activity in drinking water. The ^226Ra concentration varied between 0.3 ± 0.3 Bq/L and 3.8 ± 2.3 Bq/L. Radon concentration in granitic rock samples ranged from 53.7 ± 1.6 Bq/m³ to 1141 ± 26 Bq/m³. Soil radon concentrations varied from 18.4 ± 4.1 kBq/m³ to 208 ± 21 kBq/m³. The results indicate significant variability in radon levels, reflecting local geological characteristics and suggesting potential radiological risk associated with groundwater consumption. These data contribute to regional radon mapping efforts and support future dose assessment and mitigation strategies.