Măguri Răcătău area is characterrised by granitic rock presence at surface, favorable to radon emission and accumulation in soil and underground water. The radon measurements were made using the LUK-VR system which is based on radon gas measurement with Lucas scintillation cell. In 55 water samples taken from different points of interest from Măguri Răcătău area, Cluj County, radon concentration was measured. The results show that the radon concentrations are within the range of 3.9 Bq/L and 361.9 Bq/L with an average value of 68.4 Bq/L for all types of water. From the results of these measurements, a correlation may be observed between the radon concentration and the granite geological formations. In most of the cases, high values for radon in drinking water were found. The average effective dose equivalent from radon in well water and spring water has been calculated, the obtained values being 0.49 mSvy^-1 and 0.55 mSvy^-1, respectively.