The purpose of this study was to determine the radon concentration in water for consumption from Ban Pongkum region, Doi Saket district, Chiang Mai Province. All samples were collected from 9 sites including 7 well water samples, 1 tap water and 1 hot spring (spa pool). Radon concentration was measured with using RAD7 H2O. The results showed that the average of radon concentrations were 57.54±25.23 Bq/l, 60.90±14.17 Bq/l and 13.17±4.15 Bq/l in well, tap water and Doi-saket hot spring water (spa pool), respectively. Radon concentration in all samples were below the United States Environmental Protection Agency maximum contaminant level (U.S.EPA MCL) of 150 Bq/l. Annual effective dose resulting from radon in all samples ranged from 0.004 to 0.033 mSv/y which lower than ICRP recommended limit for members of the public of 1 mSv/y.