You'd be surprised at the prevalence of regulations! ("You have one flush toilet. U.S. regulations require every legally habitable dwelling to have at least one

You'd be surprised at the prevalence of regulations! ("You have one flush toilet. U.S. regulations require every legally habitable dwelling to have at least one flush toilet connected to an approved sewer or septic system." -- So a composting-toilet-only house seems to be illegal everywhere in the US.) Someone could buy an incredibly valuable vacant lot and fence it and never use it. As far as I know, that's not illegal but would cause the same problem you've pointed out. I don't think the utility hookup regulations are based on such "waste of space" reasoning.