Water in rivers, ponds, lakes are polluted. They can have parasites, animal waste, oil, human waste, pollution from upstream industry, dumping of chemicals , and a million other things.
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In most places in the world, water from rivers and ponds is not sanitary. It is not safe to drink without treatment because there are things like feces and dead animals in the water. There are also parasites that can infect your body if you drink the water.