===== Critical Infrastructure Sectors =====
[[ddsf:public:guidebook:06_append:glossary:start| Return to Glossary ]]

There are 16 **Critical Infrastructure Sectors** whose assets, systems, and networks, whether physical or virtual, are considered so vital to the United States that their incapacitation or destruction would have a debilitating effect on security, national economic security, national public health or safety, or any combination thereof. 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.

The Critical Infrastructure Sectors are:

  * Chemical Sector
  * Commercial Facilities Sector
  * Communications Sector 
  * Critical Manufacturing Sector
  * Dams Sector 
  * Defense Industrial Base Sector
  * Emergency Services Sector
  * Energy Sector
  * Financial Services Sector
  * Food and Agriculture Sector
  * Government Facilities Sector
  * Healthcare and Public Health Sector
  * [[ddsf:public:guidebook:06_append:glossary:i:infotech|Information Technology]] Sector
  * Nuclear Reactors, Materials, and Waste Sector
  * Transportation Systems Sector
  * Water and Wastewater Systems Sector

Source: [[https://www.cisa.gov/critical-infrastructure-sectors | Critical Infrastructure Sectors ]]