Water in many city areas not potable-Bangalore-Cities-NEWS-The Times of India: "
BANGALORE: A study conducted by the department of mines and geology on groundwater across the state has found that drinking water in several parts of Bangalore is not potable as it contains high levels of nitrate."
Nitrate levels in several areas of Bangalore have more than 200 ppm (parts per million) in water against the permissible 50 ppm. The levels have touched as high as 650 ppm in Tumkur. Excess nitrate in water causes gastric cancer and adversely affects the central nervous system and cardiovascular system, besides causing methaemoglobinacmia (when RBC turn blue).
The startling findings have now been sent to the Karnataka State Pollution Control Board for action. "In many cases, we found that groundwater was polluted due to indiscriminate use of manure for plants and chemical fertilisers. In new areas of Bangalore, lack of drainage and septic tanks is the main problem," sources said.
A case of methaemoglobinemia was reported from Banashankari in an eight-year-old girl, confirming the study's fears of nitrate levels in water. Though the study has restricted itself to groundwater contamination, the department also studied samples of Cauvery water too. "Cauvery water is free from chemical contamination ... but has bacteria in it. But then, this could be because of dirty pipes and not necessarily due to fault at the source," sources said.
BWSSB Chairman M.N. Vidyashankar said Cauvery water supplied to Bangalore undergoes dechlorination thrice before it is released. "Chlorination takes care of bacteria. As for groundwater pollution, the Board is setting up underground drainage system for the 27 new wards in the city," he said.
According to the study, nitrate levels in groundwater in following areas are: Konapanna Agrahara (Bangalore South) - 153 ppm; K.R. Puram - 116 ppm; Doddaballapur -366; Sarjapura - 255; Bidadi - 215; Avalahalli (Bangalore South) - 130; Kanakapura - 213; Ramachandrapura (Bangalore North) - 244; Mysore road - 177; Nagavarapalya -128; Chikkabanavara (Bangalore North) - 149; Nelamangala - 128; and Hoskote - 251.