How safe is your tap water? Check for the bio-films formed on your house tap, which can be potentially hosting bacteria and you will get the answer.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/biocide-lurks-your-water-taps
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-distribution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water-standards
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-supply