East Hampshire said fly-tipping was a “perpetual problem” in its area, often in remote locations and at night.
Councillor Nick Drew, a cabinet member, said: “It is very disappointing that people come to enjoy the South Downs National Park and the beautiful landscapes that it offers and decide to pollute it with their rubbish.
“Many people I speak to feel more should be done and this reward scheme will help us do that.”
September’s incident, in Julie’s Lay-by on the A31 near Alton, involved 15 tonnes of material including asbestos.
In 2024, the council reported problems with “dumping and burning on the West Sussex/Hampshire border in Rowlands Castle and on the A272”.
It said the rewards were for information leading to enforcement action, which can include fixed penalty fines or court prosecutions.
Householders can also be fined if their waste ends up in a fly-tip and they have not checked that the waste carrier was properly authorised.