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 This website is no longer updated and links to external websites and some internal pages may not work.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

Hazardous Organic NESHAP (HON) Equipment Leak Provisions Questions and Answers

This set of questions and answers provides guidance on various provisions in 40 CFR Part 63, subparts H and I. The following questions and answers are based on the final rule as promulgated on April 22, 1994 and as amended on September 20, 1994, October 24, 1994, October 28, 1994, January 27, 1995, April 10, 1995, and December 12, 1995.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

Questions and Answers for Subparts H and I of Part 63 Hazardous Organic NESHAP (HON) Equipment Leak Provisions (PDF)(16 pp, 133 K)