I used to live in India, that's the norm. We lived with them. The trick is that there's other things that eat cockroaches, that we also lived with, so it doesn't get too much of an issue. A house is part of an ecosystem, not a sterile environment.

For the record, it's almost guaranteed that any rice you eat in India has had cockroaches in the rice sack. Not a lot you can do about it. That's why we wash and cook things.