That many areas of the city get contaminated water even for drinking, is old hat.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/water-pollutants-cross-danger-mark
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-bangalore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-quality
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/total-dissolved-solids
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lakes
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-pollution
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-assessment