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 This website is no longer updated and links to external websites and some internal pages may not work.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

User's Manual for CORMX

This manual is organized to meet the informational needs of two distinctly different groups of readers: 1) personnel in environmental management positions desiring an overview of the CORMIX systems capabilities, and 2) technical staff needing assistance in actual applications. Chapter II provides a summary of the physical processes of effluent mixing, as well as an overview of the regulatory background and practice on mixing zone applications.

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