Agencies engaged in treating & supplying drinking water are responsible to find suitable method of treatment to make the water potable.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/chlorine-and-drinking-water-treatment
[2] http://admin.indiaenvironmentportal.org.in/category/author/harisaran-das
[3] http://admin.indiaenvironmentportal.org.in/category/journal/everything-about-water
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-treatment-technology
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-supply
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/micro-organisms