Assessing Security-Risk Tiers Under DHS’s CFATS

The U.S. Department of Homeland Security (DHS; Washington) began notifying some 7,000 facilities in late June that use or storage of certain chemicals may “present a high level of security risk,” under the Chemical Facility Anti-Terrorism Standards (CFATS) law. DHS ranked each facility into one of four tiers based on risk. Of the approximately 7,000 sites that DHS initially deemed high risk, 219 were classified as Tier 1, the highest risk; 756 as Tier 2; 1,712 as Tier 3; and 4,319 as Tier 4. The facilities range from large refineries and chemical...

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