how does houses in the nature deal with garbage and other kinds of waste

First time i've seen a question like this... Not sure what this has to do with unity but I would assume your making a game pertaining to this kind of stuff.

Many farmers now a days do have sewer hookups but back in the old days they had septic tanks that a lorry would need to come and empty for them when it filled up.

As for garbage they probably have to take it a landfill themselves, or they compost what they can and use it for their crops I would assume.