In a joint water-testing exercise undertaken by the south and north municipal bodies and the Delhi Jal Board (DJB), 25 out of 176 samples (14.2%) have been found unfit for drinking. Tests by the civic bodies' own staff have found 40 out of 662 samples (6.04%) unfit.
For the week ending April 20, these water samples were tested for chlorine - one set was tested by the staff of two civic bodies and another set was tested in collaboration with the DJB personnel.
Mahinder Nagpal, leader of the House in the north corporation, said the civic body had collected samples and sent them for testing after getting repeated complaints regarding inferior quality of water supply.
Only three of the 47 samples from south zone of the South Corporation were found unfit. However, Karol Bagh - which falls under North Corporation - threw up 10 unfit samples of a total of 75 tested by the civic staff. In the tests carried out with the DJB, five of the 20 samples were found unfit.
Narela in northwest Delhi had 20 unfit samples from a total 70 tested by the civic staff, while during the joint exercise, 20 of 56 samples were unfit.
"These tests have revealed shocking results. The Delhi government is responsible for the water supply and it should take necessary action," Nagpal said.
"DJB is alert to every issue of contamination," said Debashree Mukherjee, DJB CEO. She said "the results should not be taken as symptomatic for all of Delhi" as targeted sampling is done in areas where there are more complaints of contamination. "We isolate such clusters and then flush the lines again to zero in on the exact problem," she said.