Water semples representing sea water, river water, reservoir water, drinking water and underground water were studied by use of the gamma ray spectral analisis. Only gamma emitters in the (228)U and (232)Th series and (40)K were detected. No fission product was detected with specific activity 0,1 Bq/kg. The present data could be the base line for future monitoring of the radioactivity released from a nuclear plants. The variation of detected specific activities may be due to geological differences and the effect of plants.