tipping fee

from The Collaborative International Dictionary of English v.0.48

Dumpage \Dump"age\, n.
   1. The act of dumping loads from carts, especially loads of
      refuse matter; also, a heap of dumped matter.
      [1913 Webster]

   2. A fee paid for the privilege of dumping loads; called in
      some cases {tipping fee}.
      [1913 Webster]