India, Dec. 16 -- As Delhi moves to modernise its infrastructure to improve the Yamuna's water quality, untreated sewage and industrial effluents continue to heavily pollute the drains flowing into the river, according to the latest report by the Delhi Pollution Control Committee (DPCC).

The report for the month of October, found that of the 27 drains assessed, 10 had no flow or had been tapped. Of the remaining 17 drains, only one - the Shastri Park drain - met the prescribed water quality standards.

Senior government officials said the Delhi Jal Board (DJB) is planning to step up surveillance of water quality in 75 drains and sub-drains that carry untreated effluents into the river.

Under the current system, authorities monitor param...