6. Madagascar
Percentage of population using improved drinking water sources: 51.50%
An island nation in Africa, Madagascar is famous for its unique and diverse wildlife. Its clean water situation has greatly progressed over the course of fifteen years from 38% of its population using improved drinking water sources in 2000 to 51.5% in 2015. Maybe in another fifteen years, it will be able to exit the list of countries with least access to clean water.