Crossroads 331bh outside kitchen not plumbed to grey tank

Yet the dog relieves himself on everything in sight in campgrounds and their owner thinks nothing of it. What food borne illnesses would find their way into someone's food source from an outdoor sink draining a little water on the ground? A little discretion of what goes through and how much should suffice. Same with the outside shower. I've rinsed off many times with it or just a hose.