The Washington Department of Ecology has issued a more than $1 million penalty to the U.S. Department of Energy for withholding important information about the Hanford cleanup site.

Ecology leaders say without access to this data, they can’t effectively protect the land, air and water for residents in eastern Washington and surrounding communities. They say they’ve attempted to negotiate this issue with federal Energy managers for years.

Washington state regulators say the federal Energy Department is legally required to provide access to this data as part of the binding Tri-Party Agreement. That document was signed in 1989 and governs cleanup of the Hanford site.

Hanford is one of the most contaminated sites in the world – including toxic materials like 56 million gallons of radioactive and chemical waste.

The Department of Energy says it has filed an appeal with the state’s Pollution Control Hearings Board. A spokesperson wrote: “We will continue to provide appropriate access to information in a way that allows us to continue to adhere to federal laws and requirements.”