Environmental Liabilities: NASA's Reported Financial Liabilities Have Grown, and Several Factors Contribute to Future Uncertainties, Report to Congressional Addressees [open pdf - 2MB]
From the Highlights: "Decades of NASA's research for space exploration relied on some chemicals that can be hazardous to human health and the environment. NASA identified 14 centers around the country with hazardous chemicals that require environmental cleanup and restoration. NASA's Environmental Compliance and Restoration Program oversees the agency's environmental cleanup. NASA's environmental liabilities estimate is reported annually in the agency's financial statement. Federal accounting standards require agencies responsible for contamination to estimate and report their future cleanup costs when they are both probable and reasonably estimable. This report describes (1) NASA's environmental liabilities for restoration projects from fiscal years 2014 to 2019--the most recent data available at the time of our review--and (2) factors that could contribute to uncertainties in NASA's current or future environmental liabilities."
Government Accountability Office: https://www.gao.gov/