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  1. Home
  2. Renewable Fuel Standard Program

Contact Us About Renewable Fuel Standards

More Contact Information
  • More Contact Information for EPA's Office of Transportation and Air Quality
  • OTAQ “Contacts by Topic”
On this page:
  • Fuels Program Helpdesk
  • CDX Helpdesk
  • CDX Node Support
  • Fuels Program Mailing Addresses

Fuels Program Helpdesk

Email FuelsProgramSupport@epa.gov
Type of assistance
  • Registration
  • Program Regulations
  • Remedial Actions
  • Public data

CDX Helpdesk

Email helpdesk@epacdx.net
Phone number 1-888-890-1995, then select Option 1
Type of assistance
  • CDX account password resets
  • Lexis/Nexis authentication
  • Updates to CDX account information

CDX Node Support

Email nodehelpdesk@epacdx.net
Phone number 1-888-890-1995, then select Option 2
Type of assistance
  • Setting up a new node
  • Acquiring a NAAS ID
  • Troubleshooting nodes
  • Failed node submissions

Fuels Program Mailing Addresses

EPA's Fuel Programs Mailing Addresses

Renewable Fuel Standard Program

  • Learn About
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  • Regulations
  • Fuel Pathways
  • Other Requests
  • Compliance
  • RIN Data & Analysis
  • Alternative Fuels
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on May 7, 2025
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