CDC/ATSDR SVI Frequently Asked Questions (FAQ)

The CDC/ATSDR Social Vulnerability Index (CDC/ATSDR SVI) is a tool that uses U.S. Census data to determine the social vulnerability of every census tract. ATSDR’s Geospatial Research, Analysis & Services Program (GRASP) maintains the CDC/ATSDR SVI to help public health officials and local planners better prepare for and respond to emergency events like hurricanes, disease outbreaks, or exposure to dangerous chemicals.

Learn more about the CDC/ATSDR SVI in the frequently asked questions and responses below.

Flood Protection Sandbags with flooded homes in the background (Montage)

For more information, please contact the CDC/ATSDR SVI Coordinator (