In present study radon activity concentration in drinking water samples were carried out from Erbil-governorate (Kurdistan region-Iraq) by using a permeable cup provided with CR-39 alpha nuclear track detector as a passive method. The results show that the range of radon ( 222 Rn) concentration values vary from (0.081±0.002 to 14.742±0.262) Bq/l . The obtained values in this study are below the maximum contamination level (MCL) 11.1 Bq/l as recommended by US-EPA, except sample no. (S12), from

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... rsaleen region. The total annual effective dose due to ingestion and inhalation of radon from drinking water samples for adults, children and infants were determined. The maximum values found in (S12)were (0.09489±0.0007, 0.10920±0.0009 and 0.233±0.0024) mSv/y respectively, while the minimum values recorded in the (S20) from Koyea were (0.00043±0.0001, 0.00049±0.0001and 0.001±0.0004) mSv/y respectively. The results of this study well indicate that 32% and 4%, from the total annual effective doses in well and spring drinking water samples which intake by infants and children respectively in Erbil are higher than the maximum contaminate levels of 0.1mSv/y proposed in the WHO for the intake of radionuclide in drinking water.