[en] A study was undertaken to measure the dissolved radon (²²²Rn) concentration in parts of western India (Southwest Punjab) in order to evaluate its hydrological and radiological implications. Radon was monitored using Smart Radon Monitor in 25 locations. The dissolved ²²²Rn concentrations ranged from 618 to 3210 Bq/m³ in the groundwater and were well below the USEPA maximum contaminant level of 11,100 Bq/m³ and an alternate maximum contaminant level of 148,000 Bq/m³. Radiological dose due to dissolved radon was calculated and the results indicated that the estimated total annual effective dose (both from ingestion and inhalation) varied between 6.07 and 31.52 μSv/year, which is within the recommended limit of 100 μSv/year prescribed by WHO and EU Council (1998). This infers that there is no significant radiological risk due to dissolved ²²²Rn for the inhabitants of this region. ²²²Rn showed a negative correlation with corresponding U concentration while with other hydrochemical parameters the correlations were either weak or insignificant. The depth variation of dissolved ²²²Rn concentration indicated that shallow zone has a wider range of radon values as compared to deeper zone. Spatial and hydrochemical trends signify that ²²²Rn concentration is not only controlled by a variety of geochemical processes but also by surface processes. (author)