Centers for Disease Control and Prevention
Phone: 770-488-7100 (24 hours)

Domestic Preparedness Chemical/Biological HelpLine
Phone: 800-368-6498
Provides technical assistance during business hours to eligible State and local emergency responders and their organizations.

FEMA
Chem/Bio Hotline 800-424-8802 (24 hours)
Radiological Hotline 202-586-8100 (24 hours)
Report a Chemical, Biological, or Radiological emergency incident.
FEMA, Office of National Preparedness: Preparedness News and Information (May 30, 2003)

National Response Center Hotline
Phone: 800-424-8802 (24 hours)
Receives reports of oil, chemical, biological, and radiological releases and actual or potential domestic terrorism; provides technical assistance to emergency responders; and connects callers with appropriate Federal resources.

Nuclear Regulatory Commission Operations Center
Phone: 301-816-5100 (collect calls accepted)
Accepts reports of accidents involving radiological materials.