How do you keep your water at the farm from freezing? Are the pipes deeper in the ground and have extra insulation above?

Our outside faucets can freeze at 15* if over a few nites.
But I guess they don't if we remember to unhook the hose to the horse water trough. I had a frozen hose - luckily the water trough{bathtub} and holds enough for 4 days - as long as we break the ice out.