Extremely Hazardous Materials Transportation Security Act of 2004

Extremely Hazardous Materials Transportation Security Act of 2004 - Directs the Secretary of Homeland Security to issue regulations concerning the shipping of extremely hazardous materials that require: (1) physical security measures; (2) Federal, State, and local law enforcement authorities to be informed before such material is transported within, through, or near an area of concern; (3) coordination among such authorities to create response plans for a terrorist attack; (4) the use of currently available technologies and systems to ensure effective communication between material transporters, law enforcement authorities, and first responders; (5) comprehensive training for all individuals involved in the shipping of such materials; and (6) the Secretary to determine whether transportation through or near an area could be made by alternate routes at a lower security risk.

Subjects a person (other than an individual) who violates such a regulation to injunctive relief or a civil penalty of up to $100,000. Authorizes the Secretary to impose administrative penalties.

Sets forth provisions regarding whistleblower protection involving the security of shipments of such materials.