During present investigation of ground water pollution was calculated with the mearsument of level of Biological Oxygen Demand (BOD) contents. The ground water samples were collected from twelve ponds from Nipani town near sugar factory and analyzed every month throughout the year. So, we have studied levels of BOD in underground water. BOD was 62 mg/lit. The seasonal analysis indicated that the levels of BOD were generally higher in summer and winter than their levels in rainy season.