The values of radon concentration in water samples of the study area are presented in Table 1. The values in samples from the Sriganganagar district were in the range 1.6+0.2 Bq l21 (Gulabawala) to 6.5+0.9 Bql-1 (Sriganganagar city) with an average value of 4.5+0.8 Bq l21.