Renewable Fuel Standard Program

Contact Us About the Renewable Fuel Standard Program

On this page:

Support line for EPA Fuel Programs

Phone number 1-800-385-6164
Hours Monday through Friday
9:00 a.m. until 5:00 p.m. ET
Type of assistance
  • Fuel program questions
  • Registration and reporting assistance
  • EMTS technical support

CDX helpdesk

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

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

Mailing addresses for EPA Fuel Programs

US Postal Service*
Commercial Delivery 
(FedEx, UPS, etc.)

U.S. Environmental Protection Agency
Mail Code 6405A
1200 Pennsylvania Ave NW
Washington, DC 20460

U.S. Environmental Protection Agency
William Jefferson Clinton Building - North
Mail Code 6405A, Room 6520V; (202) 343-9038
1200 Pennsylvania Ave NW
Washington, DC 20004

*NOTE: Sending paperwork via US Postal Service will require an irradiation process and could possibly delay delivery.


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