Around 50 people were evacuated after two Second World War mortars were found at the tip in Segensworth.
Reports from people going to the tip have said someone dug up a Second World War shell in a garden and then took it to the Segensworth Household Recycling Centre, in Barnes Wallis Road.
The centre was closed for three hours, from 10.30am, but has now reopened.
The Army’s bomb disposal team, based in Aldershot, took away the Second World War shell.
Shaun Hopkins, site manager, said: ‘There were some bags dropped off, I turned my back.
‘I went through the bags and discovered the shells.
I can’t believe someone took it from their house to a public placeEyewitness
‘Firstly I didn’t know what they were – obviously I’m not a bomb disposal expert.
‘We have standard protocols for firearms and explosives and we put those in place.’
He said eight staff members and 40 tip users were evacuated.
A 46-year-old man, who did not want to be named, said he was told by a worker that someone had dug up the Second World War bomb at their home.
‘I can’t believe someone took it from their house to a public place,’ he said.
He added: ‘I just tried to go to the tip. They were waiting for the bomb disposal teams.
‘Everyone was just waiting outside.
‘There was about four or five cars queuing up.’
A Hampshire police spokeswoman said: ‘It was a Second World War shell.’