"Some places have them," Jyn says, ignoring the bit about cleanliness as a virtue. Sure. Life's easier and safer when you can get clean regularly enough to avoid lice or any of the other parasites that like to prey on various sapient beings. "Some places they're run by mechanical pumps, instead of hand pumps. Not everywhere. One year I lived in an place that had rain cisterns, instead. Steps cut down into the rock so you could fetch the water out."