Asylum seekers are being told about their return to the Bibby Stockholm barge after it was evacuated following the discovery of Legionella bacteria in the water supply.
The Home Office said all necessary tests have been completed on the floating vessel, which has been out of use since August.
Letters are being sent to asylum seekers confirming their re-embarkation, although it is understood no date has been given yet.
“The letters confirm the next steps for asylum seekers and reiterate that all asylum accommodation continues to be offered on a no-choice basis.
“Delivering alternative accommodation sites, such as the vessel, is more affordable for taxpayers and more manageable for communities, due to healthcare and catering facilities on site, 24/7 security and the purpose-built safe accommodation they provide.”
The update comes as a Dorset resident is bringing legal action against the Home Office over the use of the barge, which is docked in Portland Port.
Ms Parkes is the mayor of Portland but intends to bring the challenge in a personal capacity.
A hearing will take place on Tuesday.
The barge is part of Government efforts to provide cheaper alternative housing for migrants waiting for their asylum application to be processed, with former military sites also converted into accommodation.
Prime Minister Rishi Sunak has made stopping boats crossing the Channel one of his top five priorities ahead of a likely general election next year.