On Wednesday it was revealed a number of items were thrown into the river, near the site of the multi million dollar North Bank redevelopment.

Concerned Trevallyn resident Dennis James spotted the cesspool earlier this year and believes the culprits are committing the acts overnight.

Yesterday, central north parks and reserves manager Chris Emms threatened ``stiff penalties'' against those involved.

``The illegal dumping of rubbish on public land is an ongoing environmental problem that has significant cost implications to the government and the tax payer in removing other people’s rubbish,'' he said.

``Those persons caught illegally dumping rubbish can face stiff penalties.

``The public is encouraged to assist in responding to such activities.''

Mr Emms stated action would be taken to remove the rubbish, which consists of a car motor, street signs, TVs, wire and a cash register, among other items.

``The PWS is considering options to address the issue of rubbish that has been dumped into the Tamar River.''

The Launceston City Council has also vowed to help remove the waste.