Almost all rivers start out clean at their source. The source of the river may be melting spring ice, precipitation, springs, etc. As it makes its way downstream, the river becomes more polluted as it picks up various detritus like twigs, dead leaves, sand, etc. Human pollution can also add to this, especially when a town or a business dumps its waste in the river. So river water tends to get increasingly dirty the further you go downstream. Consequently, it’s hard to put a label on average water quality in that case. Additionally, there are massive differences between individuals rivers as well. It depends on the quality of the riverbed, its environment, as well as human effects.
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