The Council on Environmental Quality (CEQ) revised this guide in January 2021 to reflect the updated National Environmental Policy Act (NEPA) Implementing Regulations that became effective on September 14, 2020. CEQ modernized and clarified the regulations to facilitate more efficient, effective, and timely NEPA reviews by Federal agencies. This guide provides an explanation of NEPA, how it is implemented, and how people outside the Federal Government—individual citizens, private sector applicants, members of organized groups, and representatives of Tribal, State, or local government agencies—can participate in the assessment of environmental impacts conducted by Federal agencies.

The Spanish version below is the 2007 edition of this guide that was based on the CEQ NEPA regulations of 1978, as amended in 1986 and 2005.