Abstract: The present study deals with the seasonal variation in hydrobiological parameters of the Beehar River to see if the water is good quality for fishes. Some of the things we are looking at are temperature, dissolved oxygen (DO), acidity (pH), turbidity, alkalinity, hardness, total dissolved solids (TDS), biological oxygen demand (BOD) and other constituents of Beehar River. This study provides information about how clean or dirty the water is in Beehar River in Rewa city. The river collects different kinds of waste from homes, farms, and factories as it flows through rural areas and urban areas. In simpler terms, we examine water to understand how clean it is and how human and cultural actions impact its physical, chemical, and biological characteristics. We discovered that the natural chemical makeup, including the amount of trace elements, of the water does not harm or limit the living creatures in the water.