Rivers in western Uttar Pradesh like Kali, Krishna and Hindon have been polluted to dangerous levels because of the industrial waste released illegally into them by the industries.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/kali-river-contaminates-groundwater
[2] http://admin.indiaenvironmentportal.org.in/category/author/mohammad-ali
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uttar-pradesh
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kali
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/krishna
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hindon
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-waste
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-pollution
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/muzaffarnagar-d
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lead
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution