The Chemical Oxygen Demand is the evaluation of oxygen required for the portion of organic matter in wastewater that is exposed to oxidation and the amount of oxygen expended by organic matter from boiling acid potassium dichromate solution. It is a water quality measure used to determine the quantity of biologically active substances and biologically inactive organic matter in water. It is a rapidly measured variable for exemplifying industrial wastes, and treatment plant effluents. This test has the advantage of not being subjected to interference from toxic materials. For analysis, the water is subjected to reflux using potassium dichromate. Organic matter will partially reduce dichromate and the remainder can be measured after titrating with ferrous ammonium sulfate. Chemical Oxygen Demand is determined for both blank and samples, the difference between the volume of titrant gives the value of the particulate matter. Water samples from the automobile industry are collected and tested to check for the level of pollution for regulation and control. The results show that after treatment the water contains fewer pollutants in comparison with the untreated samples. The Chemical Oxygen Demand values are under the maximum limit given for the type of samples and are therefore permissible.