Interesting thing how powerful belief systems are.
The Ganges River is one the most polluted water sources in the world. Human cremation occurs at Varanasi and carries downstream. There is large scale industrial waste, farm pesticides and sewage throughout it.
And yet millions use it a source to sustain their life and for them it is holy. They pray in it. Bathe and clean in it. Play in it. Even drink from it.
And there are fatalities certainly, but if people from the west were to use it that way it the death toll would be far higher.