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Water quality has become a major concern due to ever increasing human developmental activities that over exploit and pollute the water resources. The physico-chemical parameters l ike pH, EC, DO, BOD, alkal inity, hardness, calcium and magnesium were analyzed during monsoon and post-monsoon season. A study on physical, chemical and biological characters of River water and its suitabil ity for drinking purpose was carried out of reservoir water of Rajkot, Gujarat. The results of the present study have been discussed it is clear that the water is not highly polluted, but the variations in physico-chemical parameters were observed as seasonally. The recorded range of physico-chemical parameters were within the maximum permissible l imit