The quality of life on earth is linked inextricably to the overall quality of the environment. For centuries, we believe that atmospheric, terrestrial and aquatic systems were sufficient to absorb and breakdown wastage from population Centre, industry and farming. However, today the resources in the world show greater or lesser degree due to our carelessness and negligence in using them. The problems associated with petroleum contaminated sites assume an increasing prominence in many countries. These pollution problems often result in huge disturbances of both the biotic and abiotic components of the ecosystem. The currently accepted disposal methods are incineration or burial in secure landfills can become prohibitively expensive when the amounts of contaminants are large. Microbial remediation of an oil contaminated site is accomplished with the help of a diverse group of microorganisms, particularly the indigenous bacteria present in soil. This process is known as bioremediation. It uses relatively low-cost, low technique, which generally have a high public acceptance and can often be carried out on site.