The groundwater in nearly 31 districts in Uttar Pradesh has been found to have a strong arsenic contamination which exposes the people to slow and consistent toxin.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/water-31-districts-polluted-arsenic
[2] http://admin.indiaenvironmentportal.org.in/category/author/amit-verma
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uttar-pradesh
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arsenic
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bureau-indian-standards-bis-0
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/toxicity-studies
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lucknow-d
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution