New Delhi, Nov. 17 -- The National Mission for Clean Ganga (NMCG) has directed Haryana to urgently cover diversion drain number 6 (DD-6) to prevent sewage and effluents from overflowing into diversion drain number 8 (DD-8), which brings drinking water to Delhi, the agency has said in an affidavit filed before the National Green Tribunal (NGT). Haryana has also been instructed to share monthly water quality reports of DD-8 with the NMCG. The affidavit was submitted in response to the tribunal taking suo motu cognisance of a July 2024 media report that highlighted thousands of fish deaths in the Yamuna near Burari in north Delhi. Similar fish deaths were reported in May this year. To be sure, the DJB told the NGT that improper maintenance of Sonipat's drain number 6, which is choked with garbage, silt and effluents, is contaminating nearby drain 8 that carries treated water used for drinking in Delhi. The two drains run parallel, and frequent overflows from drain 6 leach into drain 8, causing water quality problems, the DJB said in its March 4 submission. As per NMCG's affidavit, dated October 28 and uploaded recently, the agency convened a joint meeting on October 13, 2025, with officials of Haryana Pollution Control Board (HPCB), Delhi Pollution Control Committee (DPCC) and the Central Pollution Control Board (CPCB) to ascertain the cause of fish deaths and formulate steps to prevent their recurrence. The NMCG added that an action plan has been proposed following the meeting. It added that Haryana will include water quality monitoring reports of DD-8 in its monthly progress reports to the NMCG....