Official website of the Department of Homeland Security
Critical Infrastructure Sectors
Presidential Policy Directive 21 (PPD-21): Critical Infrastructure Security and Resilience advances a national policy to strengthen and maintain secure, functioning, and resilient critical infrastructure. This directive supersedes Homeland Security Presidential Directive 7.
PPD-21 identifies 16 critical infrastructure sectors:
Chemical Sector
The Department of Homeland Security is designated as the Sector-Specific Agency for the Chemical Sector.
Commercial Facilities Sector
The Department of Homeland Security is designated as the Sector-Specific Agency for the Commercial Facilities Sector.
Communications Sector
The Department of Homeland Security is designated as the Sector-Specific Agency for the Communications Sector.
Critical Manufacturing Sector
The Department of Homeland Security is designated as the Sector-Specific Agency for the Critical Manufacturing Sector.
Dams Sector
The Department of Homeland Security is designated as the Sector-Specific Agency for the Dams Sector.
Defense Industrial Base Sector
The Department of Defense is designated as the Sector-Specific Agency for the Defense Industrial Base Sector.
Emergency Services Sector
The Department of Homeland Security is designated as the Sector-Specific Agency for the Emergency Services Sector.
Energy Sector
The Department of Energy is designated as the Sector-Specific Agency for the Energy Sector.
Financial Services Sector
The Department of Treasury is designated as the Sector-Specific Agency for the Financial Services Sector.
Food and Agriculture Sector
The Department of Agriculture and the Department of Health and Human Services are designated as the Co-Sector-Specific Agencies for the Food and Agriculture Sector.
Government Facilities Sector
The Department of Homeland Security and the General Services Administration are designated as the Co-Sector-Specific Agencies for the Government Facilities Sector.
Healthcare and Public Health Sector
The Department of Health and Human Services is designated as the Sector-Specific Agency for the Healthcare and Public Health Sector.
Information Technology Sector
The Department of Homeland Security is designated as the Sector-Specific Agency for the Information Technology Sector.
Nuclear Reactors, Materials, and Waste Sector
The Department of Homeland Security is designated as the Sector-Specific Agency for the Nuclear Reactors, Materials, and Waste Sector.
Transportation Systems Sector
The Department of Homeland Security and the Department of Transportation are designated as the Co-Sector-Specific Agencies for the Transportation Systems Sector.
Water and Wastewater Systems Sector
The Environmental Protection Agency is designated as the Sector-Specific Agency for the Water and Wastewater Systems Sector.