The purity and safety of potable water supplied to the people of Karachi had become a serious health concern.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/karachiites-getting-contaminated-water-keenjhar-lake
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/pakistan-observer
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/karachi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pakistan
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-asia
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lake-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-supply
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-quality
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution