Sewage Treatment plants are used to treat sewage generated from residential, institutional, commercial and industrial establishments which includes household waste liquid from toilets, baths, showers, kitchens, sinks and so forth that is disposed of via sewers. In India, different treatment technologies like ASP, UASB, Oxidation pond and advanced technologies like SBR, MBR are adopted for the treatment of sewage. Central Pollution Control Board carried out study on status of Municipal wastewater generation and treatment capacity in Metropolitan cities, Class I cities and Class II towns of India and published a document (CUPS/61/2005-06). The sewage generation is about 38254 MLD whereas treatment capacity developed is only about 12000 MLD and 269 numbers of STPs are installed in India. CPCB has carried out an inventorization of Sewage Treatment Plants (STPs) located in India in the year 2014-15. There are 816 STPs having capacity of 23277MLD in 28 States/UTs of India. Out of 816 STPs, 522 STPS are operational, 79 STPs are Nonoperational, 145 STPs are under construction and 70 STPs are proposed for construction.