The 16 CISA critical infrastructure sectors

The 16 sectors, as designated in PPD-21, are: Chemical; Commercial Facilities; Communications; Critical Manufacturing; Dams; Defense Industrial Base; Emergency Services; Energy; Financial Services; Food and Agriculture; Government Facilities (CISA's current site labels this "Government Services and Facilities"); Healthcare and Public Health; Information Technology; Nuclear Reactors, Materials, and Waste; Transportation Systems; and Water and Wastewater Systems. Each sector has a designated Sector Risk Management Agency responsible for day-to-day federal coordination with that sector's owners and operators.