More than 10 tonnes of litter is due to be dumped in the town centre on Thursday.
Usually Sutton Council would be tasked with clearing such a mess up - but in this case it is the council putting it there.
The idea is a stunt to encourage people not to drop litter.
The 11 tonnes of rubbish being heaped outside Waterstone's in Sutton High Street is being put there to illustrate the amount of litter dropped in Sutton every day.
As well as the eye-catching mound of rubbish, council litter pickers, councillors and other staff will be on hand to tell people why they should not drop litter and explain how the £4m it spends each year on removing waste from the streets could be better spent.
The litter mound will be in the High Street from 9.30am to 3.30pm.
- Mayor Sadiq Khan to London's EU migrants: 'You are welcome here'
- EU referendum voters queued for "hours" waiting for Sutton Council to fix technical glitch
- EU Referendum 2016: As Britain votes to leave, how did your borough vote in south west London and north Surrey?
- David Cameron to RESIGN as Britain votes to leave European Union
- Brexit: Sutton Councillors and MPs react to historic vote as the Borough defies London trend