Jump to main content or area navigation.

Contact Us

Fuels and Fuel Additives

Fuels Programs Support

EPA Fuels Programs Support Line

  • Fuels programs questions; registration and reporting assistance

    • email:support@epamts-support.com

    • 1-800-385-6164

Using EMTS

  • EMTS Technical Support
    (Monday through Friday 9:00 a.m. until 5:00 p.m. ET)

    • email: support@epamts-support.com

    • 1-800-385-6164

Establishing CDX Login

  • CDX Helpdesk

    • email: helpdesk@epacdx.net

    • 1-888-890-1995, then select Option 1.

NAAS Authentication and Nodes

  • CDX Node Support

    • email: nodehelpdesk@epacdx.net

    • 1-888-890-1995, then select Option 2.

If you have questions or request information, please contact the appropriate support or help line found on the Support & Help page.

Please visit EPA's Transportation and Air Quality web-based repository of mobile source documents, Document Index System (DIS). This searchable repository contains regulations, Federal Register notices, policy letters, and guidance documents.

Please visit our Related Links page for other fuel related information within EPA, other U.S. Agencies, and other fuel related websites.

This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ).
For more: About Us | Get E-mail Updates | Browse the A to Z Subject Index.

Jump to main content.