NGT had said "a project of national importance is being carried out and all authorities including Centre and state government do not know how many drains are polluting Ganga.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ngt-forms-panel-check-sewage-joining-ganga-through-drains
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-news-analysis-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uttar-pradesh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ganga
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-green-trbunal-ngt
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-pollution-control-board-cpcb
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/jharkhand
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bay-bengal
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution