I think it's been covered, but for clarity, a FHU site will always mean you have water, electric and sewer. That fact that a campground has sewer service simply means that some sites don't have sewer, but others likely will. RVparkreviews.com is very helpful in this way. They have a listing for the campgrounds that shows, at a glance, whether they have sewer, 30a, 50a, etc... I find this to be very useful in planning.