DJB to NGT: water contamination in janakpuri due to dead line interconnection
In a reply to NGT dated July 25, DJB said it collected 59 samples between March and July 15 from A Block, Janakpuri, where residents had complained that the drinking water supply was contaminated with sewage. Earlier, CPCB reported finding six of 20 water samples lifted from the area contaminated with E. coli and faecal coliform, indicating sewage presence in the water.
DJB told NGT, "Sampling of water was carried out regularly by DJB's testing and quality control division in coordination with RWA members to test the quality of water in the affected areas.
A total of 59 samples were collected from March 2025 to July 15, 2025. Of these, only three samples — from A1/32 (dated March 9), A1/57 GF (dated April 25) and A1/141 SF (dated June 20) — were found to be unsatisfactory. However, after taking remedial measures, fresh samples were collected from the said premises, all of which were thereafter found satisfactory.
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It added that during an inspection on July 18, it found an abandoned and unplugged house connection in A Block that was suspected to be a potential contamination source.
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It was disconnected and sealed. "Further, to effectively manage and isolate the water supply network, three sluice valves were installed in July," DJB said. "This led to the identification of two major contamination sources: (i) A cracked gate valve near Gate No.
4 of A1 Block, which was temporarily repaired on July 20 and finally replaced on July 23. 2. (ii) A cracked underground water pipe near A1/36, which was identified on July 21 and replaced at night on July 22.
Our efforts continue to find hidden underground contamination sources to plug or repair."
As an interim arrangement, DJB deployed water tankers in the area to provide potable water, but the residents "haven't availed of the same". As a long-term measure, the board has "conceptualised" the replacement of water and sewer lines older than 40 years in the affected area. The tenders for the work have been floated, DJB claimed.
Taking note of the CPCB reports on the contaminated water, NGT had upbraided the water board for failing to act and provide clean water to residents for nearly three months. On May 30, NGT had further ordered DJB to provide clean drinking water to the affected area through alternate sources until the problem was resolved.
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