washing dishes-is grease and food safe down sink drain?

LOLOLOLOL. just remembered that the campground that we go to has wash stations all over the place setup to wash pots and pans...so I guess the question was all moot anyways... I will use there sink every day to wash everything. but I guess its good to know that if im in campground with no wash station that I can dump that dirty dishwater down the black water tank...this is all good tips....