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 This website is no longer updated and links to external websites and some internal pages may not work.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

New Source Review (NSR) Permitting

New Source Review Laws & Statutes

Congress passes laws that govern the United States. To put those laws into effect, Congress authorizes certain government agencies, including EPA, to create and enforce regulations. The Clean Air Act is the law that requires New Source Review (NSR) permits.

  • Prevention of Significant Deterioration (PSD) Permits are required by Part C of Title I.