Links:
[1] http://admin.indiaenvironmentportal.org.in/news/hc-tells-railways-spell-out-steps-taken-ensure-clean-drinking-water
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/high-court
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rail-transport
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water-quality
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bureau-indian-standards-bis-0