Half of Lucknow gets unsafe drinking water as the Gomti has dangerous levels of sewage content.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/murky-water-belies-rivers-lifeline-tag
[2] http://admin.indiaenvironmentportal.org.in/category/author/priyanka-singh
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-lucknow
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uttar-pradesh
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gomti
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lucknow-t
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-treatment-plants-stp