As compared to the South Corporation, where just 1.2 per cent samples failed to meet the requisite criteria, its counterpart in the North fared much worse in the testing done by the civic body in coordination with the Delhi Jal Board.
According to the testing done by the corporation's own laboratory, 37 out of 420 samples from NDMC were found to be unfit for consumption.
Narela and Civil Line zones were the worst affected with 20 out of 70 and seven out of 17 samples failing the tests.
As far the 151 samples tested jointly by the civic body and the Delhi Jal Board are concerned, 25 or almost 17 per cent from the North Delhi area were declared unsuitable for drinking.
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The joint testing of 70 samples from the South saw all of them passing the test.
The testing was not undertaken in the East Delhi Municipal Corporation area and hence the figures for that part are not available in the report.
"We have been repeatedly asking both the Delhi government and the Jal Board to look into the matter but to no avail," said Leader of the House in North Corporation Mahendra Nagpal while giving details of the report.