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 This website is no longer updated and links to external websites and some internal pages may not work.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 »

National Environmental Policy Act in Indian Country

The National Environmental Policy Act (NEPA) directs federal agencies to assess the potential environmental effects of their proposed major actions significantly affecting the human environment and inform the public about those potential effects.

For certain EPA actions, if the effects are likely to be significant, EPA prepares an environmental impact statement (EIS). EPA solicits participation of the tribal government as a “cooperating agency” when the project’s effects may affect Indian country and other tribal areas.

Activities in Indian country and in other tribal areas often require a greater level of NEPA involvement than the same activities in non-tribal areas when these activities occur on tribal lands held in trust by the federal government. The Department of Interior, Bureau of Indian Affairs is the cognizant entity for NEPA in Indian country.