Eli5: How does bacteria form in still water and not running water?

Question

Eli5: How does bacteria form in still water and not running water?

In: 3

Answer 1

Bacteria grows in all sorts of water. It’s just that if the water is sitting still, it lets *more* bacteria grow in that tight space and form bigger colonies of harmful things. If the water is running, it’ll all be spread out and there will be less, if any, harmful things in a sample of water.