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.
Depends... We were in a state park in NM and they said grey water on the ground was OK to water the plants. But, the problem would still be that the hose is used for black water also and might have some nasty stuff in it from your last dumping.