Below are links to past (archived) versions for NEPA regulations and guidance issued by the Council on Environmental Quality, and related documents. This page also includes links to certain other historical documents broadly applicable to NEPA.

Also see, on, web pages on CEQ guidance and the CEQ NEPA regulations.

Development of Regulations

2023 Update to CEQ NEPA regulations

2022 Update to CEQ NEPA regulations

2020 Update to CEQ NEPA regulations

Address Change (revision to 40 CFR 1506.9)

Removal of "worst case analysis" (revision to 40 CFR 1502.22)

Original Regulations implementing NEPA (40 CFR parts 1500-1508)

NEPA Guidelines (replaced by regulations)

Archived Guidance

Reports and Other Documents