What types of worms live in fresh water?

For example, freshwater bodies are inhabited by parasitic worms that are dangerous to humans. These worms include the hairy worm. This is a very ancient water worm. As a rule, adult worms bore through the host’s body, and then return to the reservoir again. Filariae are also found in fresh water bodies. These are also worms. These are quite thin worms, in length they can reach half a meter. But in the human body, these worms can live almost anywhere, even in the head.