Transporting Manhattan’s garbage through a controversial ­Upper East Side waste-transfer station would cost triple what the city is now paying, according to a new study.

The findings of the Independent Budget Office provided new ammunition to opponents who have been fighting the waterfront transfer station since it was first proposed in 2006 by the Bloomberg administration.

The IBO said trash that now costs $93 a ton to ship to New Jersey and Yonkers for incineration would cost $278 a ton via the transfer station, which is ­ under construction.