India, June 7 -- The Delhi Jal Board (DJB) has told the National Green Tribunal (NGT) that it will fix the issue of sewage water entering the drinking water supply in Janakpuri, a month after a study found that 30% of water samples tested in Janakpuri's A block were contaminated with E. coli and faecal coliform.

In an undertaking, the water agency, however, said an examination of the area revealed that water and sewer pipelines in and around the block were nearly 40 years' old and have corroded. This, it claimed, was leading to contamination and mixing. Replacing the drinking water and sewer lines will solve the issue, it said.

Last month, the Central Pollution Control Board study studied water samples in the area following a plea filed...