HUMAN life depends on availability of clean and safe water. United Nations (UN), water requirements per person range from 20 to 50 decent litres per day.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/tanzania-joint-efforts-needed-combating-water-pollution
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/all-africa
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-quality
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tanzania
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-supply
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/developing-countries
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa