Letting the grey water out a bit to extend it's use?

I was in a CG in GA that allowed the gray water to drain directly on the ground. I can't say that I noticed any gray water residue anywhere around the vacant campsites, nor was there any smell or indication that it was causing a problem, nor could I tell as I was packing up that my gray water had pooled or smelled. I personally don't think gray water hurts anything, but I don't dump it anywhere it's not allowed.