The construction work on the Okhla sewerage treatment plant (STP) under the Yamuna Action Plan Phase III is likely to be completed by December 2023. Currently, about 92 per cent of work has been completed on the project. The project involves the development of an STP having a capacity of 564 million litres per day. The project entails an estimated investment of Rs 6,650 million. The project is being carried out under the National Mission for Clean Ganga.