The Supreme Court on Tuesday stayed a National Green Tribunal (NGT) order asking Delhi's Lieutenant Governor to head a high-level committee constituted to deal with issues concerning rejuvenation of Yamuna river.

A bench comprising Chief Justice D Y Chandrachud and justices PS Narasimha and Manoj Misra agreed to hear the Delhi government's plea challenging the previous order of the NGT and issued notice to the petitioner on whose application the tribunal had passed the order.

The NGT had constituted the high-level committee of authorities concerned in Delhi where pollution of Yamuna is higher compared to other river basin states, and said, "We request the Lieutenant Governor, Delhi, who is chairman of DDA and administrator of Delhi under Article 239 of the Constitution, to head the committee." Senior advocate Abhishek Singhvi, appearing for the Delhi government, referred to two paragraphs of the NGT order.

''Issue notice... There shall be a stay of the operation of the direction issued on January 9, 2023 by the National Green Tribunal to the extent that the Lieutenant Governor has been directed to be a member of the committee and to chair it," the Supreme Court said.

Noting that substantial work remains unexecuted for the rejuvenation of Yamuna, the NGT had formed the committee and requested the Delhi LG to head the committee.

Referring to the recent judgement of the top court on the administrative services row between the Centre and the Delhi government, the plea stated the effect of the NGT's orders cannot be to confer executive powers on an authority that cannot, under the constitutional scheme, be conferred on it and is instead vested with the elected government.

"It is submitted that the issues concerning the present appeal are within the domain of the legislative powers conferred upon the Legislative Assembly and do not fall within any exception as laid down in the Constitution.

"In light of the above-settled position of law, affirmed most recently by this Court in Civil Appeal 2357 of 2017, the order of NGT is legally not tenable," the petition said.

It said remedial steps as suggested by the NGT such as using treated water for agriculture, horticulture or industrial purposes, preventing discharge/dumping of any waste, protecting of flood plain zones, etc are all which require budgetary allocations that are cleared by the legislative assembly and so the role of the elected government becomes extremely necessary.

"The elected government is keen to work on the issue of making Yamuna a clean river free from any kind of pollutants and to allocate the necessary funds, however, the present scheme under the impugned order sets up a committee headed by an unelected figurehead and side-lines the elected and popularly accountable government of the NCTD," the plea said.

"While the appellant acknowledges the need for inter-departmental coordination and cooperation to ensure the cleaning of the Yamuna and for remedial measures in that regard, the appellant is aggrieved by the executive powers conferred on the Lt. Governor vide the impugned order over areas in which only the elected government of the NCT of Delhi enjoys competence," it said.

In its order, the NGT had said there is still a huge gap between the generation of sewage and available treatment facilities.

"The estimated gap is said to be 194.5 million gallons per day (MGD) of sewage, interception and diversion of about 147 drains (connected to Najafgarh and Shahdara drains) and other small drains joining bigger drains remains (pending) and wastewater from 1,799 unauthorized colonies and 630 JJ clusters is reportedly going into the Yamuna," the NGT had said.

The green panel had said there was a need to plant trees on the flood plains of the river and buffer zones of the drains, besides undertaking engineering, structural and biological measures for a comprehensive catchment area treatment plan.