5. Indonesia
Why is this country on our list of most water polluted countries with the worst pollution in the world, you wonder? Well, Indonesia’s Citarum River is the most polluted river on the Earth and looks more like a junkyard than anything else. It is an environmental disaster all on its own being home to untreated sewage with plastic floating all over the surface and acting as a dumpster for hundreds of factories. The water pollution prevalent in this country is evident from the fact that demand for water purifiers has gone up in recent times.