At what temp do you remove water hose?

I'm in the use your pump group basically because I had a pump fail and replaced it and the first campground reservation was for several days, I hooked up the water. The next morning I awoke to a flooded site. The check valve in the brand new pump failed. A secondary reason is I hate getting up in the morning and disconnecting the hose when we're in the travel mode and not destination mode. It's easier to get up, disconnect the power and maybe the cable TV and ready to go. But then again like folks who use only their on board showers, I've paid for a pump, it's more than adequate for our use so, why not use it.

On edit, it has been two years since the new pump failed and I haven't fixed the internal check valve, now it's added to the list.