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 This website is no longer updated and links to external websites and some internal pages may not work.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

Assessing and Managing Chemicals under TSCA

Section 8(a) PAIR User Guide – Primary Support

This document presents the user guide for the Office of Pollution Prevention and Toxics’ (OPPT) Section 8(a) Preliminary Assessment Information Rule (PAIR) Reporting application. This document is the user guide for the Primary Support user of the Section 8(a) PAIR Reporting tool.

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