An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Radiation Protection

WIPP Magnesium Oxide (MgO) - Planned Change Request

On April 10, 2006, the U.S. Department of Energy (DOE) submitted a planned change request pertaining to the amount of MgO emplaced in the WIPP repository. MgO is an engineered barrier that DOE included as part of the original WIPP Certification Decision that ensures repository releases will be well within the EPA's regulatory limits.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.