In 2015, the Government of India approved the Namami Gange program for cleaning, rejuvenation, and protection of the River Ganga and its tributaries. This project forms part of many planned interventions to ensure that no untreated domestic sewage flows into the river Ganga. This includes Interception & Diversion works and development & operation of Sewage Treatment Plants (STPs) and associated infrastructure. The Prayagraj project has been approved under the Hybrid Annuity based Public Private Partnership (PPP) for the development & operation of 6 existing and 3 new STPs in the Prayagraj area. Under this model, a private investor/developer will design, build, finance, operate and transfer the asset (STP) to the Project Executing Agency/Jal Nigam/Jal Sansthan/Urban Local body at the end of the Concession Period (in this case, 15 years).

Prayagraj (previously known as Allahabad), is one of the largest cities in Uttah Pradesh. It is surrounded by the river Ganga and Yamuna in three directions. The holy confluence of the Ganga, Yamuna and Sarasvati rivers(Sangam) is located to the south-east of the city. This is also a location for the Maha Kumba Mela, hailed as the world’s largest congregation of Hindu devotees.