are we talking fleas here, what are water bugs??
I think bugs happen to alot of people, but some people just don't mind, and I'm not kidding about that. Some people just deal with fleas in their house, and it doesn't bother them. It WOULD bother me.
So I don't know. It could be something that is in your basement, or maybe the cat brought in? Is he/she an outdoor cat?
What do these bugs look like?, are they tiny black and jump. Fleas jump!!, if they don't jump, they're not a flea...