A year after Superstorm Sandy wreaked havoc across the eastern United States, only a fraction of the aid money earmarked for recovery has been used, in what some claim is a painfully slow and opaque process.

Only $5.2 billion of the pledged $47.9 billion had been tapped by cities and states by the end of August, according to the U.S. Department of Housing and Urban Development. And tracking those funds has been complicated, lawmakers said.

"Transparency is woefully lacking. We don't know where the money is. We know people have been approved for grants, but the money has not been distributed," said New Jersey Assemblywoman L. Grace Spencer, chair of the environment committee.