ABSTRACT        Groundwater in El Sadat City has a particular importance where it is One of the important water sources for fresh water used for drinking and agricultural purposes. Thirty-five groundwater wells were collected during 2017 and were analysis for chemical characteristics.These data has been used to preliminary evaluation of suitability of groundwater for drinking and irrigation purposes using groundwater quality indices which are (DWQI), (IWQI) ,(TDS)  The TDS in groundwater varied between 191mg/l to 1578 mg/l with an average value of 484.6 mg/l., the (DWQI) good water type for drinking purpose (65.7 %), poor water are (20 %) from the samples, Very poor water are (11.4 %) , and Unsuitable water is (2.8 %) ,the (IWQI) All samples were of moderate usability for agricultural purposes