An official website of the United States government.

Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

National Environmental Policy Act Policies and Guidance

EPA has prepared policies and guidance for carrying out its responsibilities under the National Environmental Policy Act (NEPA) and reviews under Section 309 of the Clean Air Act. These documents discuss the specific technical issues EPA looks for in NEPA documents. To learn more, select the topic from the list below.