Biochemical Oxygen Demand (BOD) is a measure of organic materials present in water. If BOD value is less than 5 ppm, then water sample is to be

The amount of O2 required by bacteria to breakdown the organic matter present in a certain volume of water sample is called BOD (Biochemical Oxygen Demand).If BOD < 5, it means less O2 is required and water sample is already rich in O2. This water is pure water.Note: If BOD = 17 or more, water is highly polluted.