There are 12 "hot spots" in eight States where river water was found to be contaminated.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/river-water-contaminated-12-stretches-across-8-states
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-line-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-water-commission-cwc
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rivers
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/irrigation
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisheries
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arsenic
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fluoride
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ganga
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/yamuna
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/narmada
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tapti
[16] http://admin.indiaenvironmentportal.org.in/category/thesaurus/brahmaputra
[17] http://admin.indiaenvironmentportal.org.in/category/thesaurus/krishna
[18] http://admin.indiaenvironmentportal.org.in/category/thesaurus/godavari
[19] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cauvery
[20] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mahanadi
[21] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage
[22] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pesticides
[23] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uttar-pradesh
[24] http://admin.indiaenvironmentportal.org.in/category/thesaurus/madhya-pradesh
[25] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rajasthan
[26] http://admin.indiaenvironmentportal.org.in/category/thesaurus/jharkhand
[27] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[28] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[29] http://admin.indiaenvironmentportal.org.in/category/thesaurus/orissa
[30] http://admin.indiaenvironmentportal.org.in/category/thesaurus/andhra-pradesh
[31] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[32] http://admin.indiaenvironmentportal.org.in/category/thesaurus/erode-d
[33] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noyyal
[34] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hassan-d