Is there no problem dumping grey water on the ground in campgrounds? My grey water doesn't have food particles or grease. It's only hand soap, or dishwashing soap.
I cannot think of a more pleasant experience than walking around camp and stepping in someones dish and bathroom sink water. What a delightful thought.:E
Karma will of course catch up to that person, when they step in a pile of dog poop left by another inconsiderate person who did not pick up after their dog. :S