This document reviews the waste water treatment methodologies used in the automobile industry. It begins by discussing how automobile industry waste water can contain various pollutants like oil, grease, paint, and high concentrations of chemicals. It then describes the common physical, chemical, and biological treatment methods used, including coagulation, flocculation, sedimentation, and the use of microorganisms. Specifically, it provides details on the waste water treatment process at Bajaj Auto Ltd in India, which uses various tanks and treatments like screening, sedimentation, flocculation, and biological processes to treat waste water without discharging any polluted water. The goal of these treatment methods is to remove pollutants and allow the water to