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Untreated sewage drains into river Yamuna flowing through Delhi due to which the Yamuna water gets contaminated.

According to Central Pollution Control Board (CPCB), CPCB has initiated monitoring and performance evaluation of Sewage Treatment Plants of Delhi. Waste Water Generation in Delhi has been assessed as 3800 MLD and the Waste Water Treatment capacity developed so far is 3059.48 MLD comprising 40 STPs, leaving a gap of 740.52 MLD in the treatment capacity. The STP at Coronation Pillar � I (old) of 45.4 MLD has not been included in the assessment due to its closure.

Out of 40 STPs, 32 STPs (2643.35 MLD) are operational, 07 STPs (325.33 MLD) are non-operational and 01 STP of capacity 90.8 MLD is under construction. There is gap of about 36.53 % as far as development of operational sewage treatment capacity is concerned. The capacity of treatment facilities is only 63.46 % as against the quantity of waste water (1941.67 MLD) reaching to STPs. The operation of these STPs is being maintained by Delhi Jal Board. According to the Delhi Jal Board (DJB), the major drains in Delhi receive untreated waste water flows from mainly two sources (i) from the adjoining state Haryana through Badshahpur drain, Gurgaon, Panipat and Sonipat drains and (ii) from the sub drains emanating from the unsewered areas of Delhi.

Delhi has undertaken a mega project to tap all such sub drains carrying untreated waste water flows into the major drains, directions have been issued by Hon'ble NGT to Haryana state to establish its waste water treatment plants to ensure that only treated effluent flows into the drains out-falling into river Yamuna.

DJB has informed that the orders issued by NGT, regarding setting up of Sewage Treatment Plants to treat sewage being emptied into river Yamuna, are being followed. Sewerage projects under DJB related to cleaning of Najafgarh & Supplementary drains under Phase-1 of 'Maily Se Nirmal Yamuna � Revitalization Plan 2017' have been taken up on priority in compliance of directions of Hon'ble NGT.

There are seven sewerage projects of DJB related to construction of 15 waste Water Treatment Plants (WWTPs), three sewage pumping stations, connected sewer lines and rehabilitation of old sewer lines which have been taken up for implementation in Phase-1 in compliance of the directions of Hon'ble NGT.

This Ministry is supplementing the efforts of the State Government for pollution abatement of river Yamuna under Namami Gange Programme by providing financial assistance to Delhi under JICA assisted YAP Phase-III project. In this project, five components in Rithala & Kondli region Pkg R1a, R2, K1, K2 & K3 have been recommended by Empowered Steering Committee (ESC) and further sanctioned.

This information was given by Union Minister of State for Water Resources, River Development and Ganga Rejuvenation Prof. Sanwar Lal Jat in a written reply in Rajya Sabha today.