Under the proposed scheme, damaged trunk sewers will be rehabilitated to maximise the utilisation of available treatment capacity. The sewage treatment plants in three catchment areas of Delhi, namely Okhla, Kondli and Rithala, will also be rehabilitated and modernised.

Central Pollution Control Board (CPCB) is regularly monitoring the water quality of River Yamuna at various locations. The water quality in the stretch of the river Yamuna from Tajewala to Palla in Haryana is found to be within the prescribed limits.

Currently, the Delhi stretch contributes the maximum pollution load to the river. The stretch of the river in the vicinity of Delhi (downstream of Wazirabad barrage to upstream of Okhla barrage) and in parts of Uttar Pradesh does not meet the standards in terms of Bio-chemical Oxygen Demand.

The water quality of Yamuna has not shown the desired improvement owing to a large gap between the demand and availability of sewage treatment capacity and lack of fresh water in the river.

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The interceptor sewer project has been approved by the Cabinet Committee On Economic Affairs under Jawaharlal Nehru National Urban Renewal Mission of the Ministry of Urban Development.