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 This website is no longer updated and links to external websites and some internal pages may not work.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

Fuels Registration, Reporting, and Compliance Help

User Guides for OTAQDCFUEL in the Central Data Exchange (CDX)

These documents provide instructions for the Office of Transportation and Air Quality (OTAQ) DCFUEL Reporting System. OTAQDCFUEL is the system for reporting compliance information and is accessed through the Central Data Exchange (CDX).