It is unclear who will pick up the tab for cleaning up the properties that General Motors helped to pollute but did not own when it went into bankruptcy last year.

An unusual $1.7 billion loan from the U.S. and Canadian governments will cover some of the costs of dealing with contamination on 120 properties that GM transferred to Motors Liquidation Co. during the bankruptcy process, Great Lakes Echo reports, but this money won’t cover work that needs to be done to address GM’s pollution of land owned by others.

State and federal environmental officials said that leaves them with two types of sites that need millions of dollars for cleanup but won’t get a crack at that money:

Fifty landfills and other Superfund sites where GM dumped hazardous waste but never owned the property

Former factory sites that GM polluted before donating them to communities for redevelopment

These are cleanups that the automaker would have at least contributed to if it had not gone bankrupt.

Great Lakes Echo reports that most of the unowned sites are landfills and that federal environmental and wildlife agencies have appealed to the New York bankruptcy court that is handling GM’s case for funds for clean up work.

The U.S. EPA, Fish and Wildlife Service, and National Oceanic and Atmospheric Administration have already spent $190 million working on these sites. They say they’ll need another $1.8 billion to finish the job.

How the court handles these requests could have real impact on Michigan ecosystems.

Of the 50 landfill and dumping sites, 32 are in the Great Lakes states, where the EPA estimates it will need another $305 million to cover past and future cleanup costs.