Tehran potable water is mainly provided from surface water resources including Karaj and Jajrud rivers. There are no documented and valid data on flouride concentration in different Tehran water supplies. In this study it was attempted to determine flouride concentration in surface water resources supplying Tehran drinkink water. In this regard, 8 stations along the Karaj River and 5 station along the Jajrud River have been selected and during 8 months study representative samples were taken on the basis of two months intervals. According to the study results the flouride concentrations were 0.15-0.35 and 0.28-0.52 mg/l in Karaj and Jajrud rivers respectively. These concentrations are below drinking water standard limits (0.7-2.0 mg/I) and thus it is recommended to adjust flouride concentration in water treatment plant or to provide it through other ways such as supplementary diet programs.
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