Present paper deals with the assessment of water quality of Gagan River in the rainy season between two year time duration. In Gagan river water quality is adversely effected by improper sewage and effluent discharge from small and large scale discharges, human activities etc. The result obtained from different parameters studied are pH (6.54-8.02), BOD (22.1-49.0), COD (45.5-68.55), Alkalinity ( 235-269), Turbidity (125-666) etc. Each of which is greater or lesser in quantity.