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Work to replace old sewer lines in Janakpuri's A-1 Block is progressing to address long-standing drinking water contamination. The Delhi Jal Board informed the National Green Tribunal that about 40% of the project is complete, with 450 metres replaced out of the planned 1,140 metres. The issue, linked to leakage between sewer and water pipelines, had been confirmed through tests showing coliform bacteria and E. coli. Delays due to GRAP restrictions affected progress, but additional resources have now been deployed. The remaining work is expected to be completed by April 30.
The sewer line replacement work in Janakpuri's A-1 Block is moving ahead as authorities work to resolve contamination in the drinking water supply. The Delhi Jal Board informed the National Green Tribunal that around 450 metres of sewer pipeline have been replaced so far out of the total planned 1,140 metres, indicating that about 40% of the project has been completed. The remaining work is scheduled to be finished by April 30. Advertisement
The issue came into focus after residents raised repeated complaints about polluted water supply. The local Residents Welfare Association had approached the tribunal, highlighting that sewage was mixing with drinking water pipelines. Following this, inspections and testing were carried out by the Central Pollution Control Board, which confirmed the presence of coliform bacteria and E. coli in multiple samples collected over different periods. These findings indicated that the water supplied in the area was not safe for consumption.
In its submission, the Delhi Jal Board stated that the contamination was mainly due to ageing and damaged sewer infrastructure, which allowed leakage and cross-contamination between sewer lines and drinking water pipelines. The replacement work is aimed at removing these damaged sections and installing new pipelines to prevent further mixing.
Progress on the project had slowed during the past few months due to restrictions under Stage III and Stage IV of the Graded Response Action Plan (GRAP), which limits construction activities to control pollution levels. This affected on-ground execution and delayed timelines. The agency informed the tribunal that it has now increased manpower and deployed additional machinery to speed up the remaining work and meet the deadline.
The problem of contaminated water supply in Janakpuri has been reported for some time. Residents had earlier complained about foul smell, discoloration, and poor water quality in household supply. In some cases, earlier inspections had also pointed to pipeline leakages and poor maintenance as key reasons behind the issue. The tribunal had taken note of these concerns in previous hearings and directed authorities to take corrective action.
The ongoing work is part of a focused effort to address these structural issues in the underground network. Officials indicated that once the damaged sewer lines are fully replaced, the chances of contamination entering the drinking water system are expected to reduce significantly.
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