The aim of this study was to evaluate the amount of nitrate concentration in groundwater resources (wells) and drinking water distribution network of Robat-Karim city of Tehran Province, Iran. The study was accomplished during 8 months (March–Oct 2009). For this purpose, 40 samples from groundwater resources (wells) and 32 samples from water distribution network were collected and analyzed. In this study, a spectrophotometer was used for nitrate analysis of all samples. Based on the results of this study, the maximum, minimum and mean amounts of nitrate concentrations in wells and distribution network samples were 5.9, 0.2, 2.1 and 4, 1.4, 2.05 mg NO3-N/L, respectively. The amounts of nitrate concentrations in all samples were much lower than its permissible levels in national and international standards.

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