The Food and Agricultural (FA) Sector is composed of complex production, processing, and delivery systems and has the capacity to feed people and animals both within and beyond the boundaries of the United States. Beyond domestic food production, the FA Sector also imports many ingredients and finished products, leading to a complex web of growers, processors, suppliers, transporters, distributors, and consumers. This sector is critical to maintaining and securing our food supply.

The Energy Sector consists of widely diverse and geographically dispersed critical assets and systems that are often interdependent of one another. This critical infrastructure is divided into three interrelated segments or subsectors—electricity, oil, and natural gas—to include the production, refining, storage, and distribution of oil, gas, and electric power. The Energy Sector supplies fuels to the transportation industry, electricity to households and businesses, and other sources of energy that are integral to growth and production across the Nation. In turn, it depends on the Nation’s transportation, information technology, communications, finance, water, and government infrastructures.

The Water and Wastewater Sector is a complex sector composed of drinking water and wastewater infrastructure of varying sizes and ownership types. Multiple governing authorities pertaining to the Water and Wastewater Sector provide for public health, environmental protection, and security measures, among others.

The Transportation Systems Sector consists of seven key subsectors, or modes: Aviation, Highway and Motor Carrier, Maritime Transportation System, Mass Transit and Passenger Rail, Pipeline Systems, Freight Rail, Postal and Shipping.

The Communications Sector provides products and services that support the efficient operation of today’s global information-based society. Communication networks enable people around the world to contact one another, access information instantly, and communicate from remote areas.

Critical government workers, as defined by the employer and consistent with Continuity of Operations Plans and Continuity of Government plans. Federal, State, and Local, Tribal, and Territorial employees who support Mission Essential Functions and communications networks. The Courts, consistent with guidance released by the California Chief Justice.

The Critical Manufacturing Sector identifies several industries to serve as the core of the sector: Primary Metals Manufacturing, Machinery Manufacturing, Electrical Equipment, Appliance, and Component Manufacturing, Transportation Equipment Manufacturing Products made by these manufacturing industries are essential to many other critical infrastructure sectors.

The Financial Services Sector includes thousands of depository institutions, providers of investment products, insurance companies, other credit and financing organizations, and the providers of the critical financial utilities and services that support these functions.

The Chemical Sector—composed of a complex, global supply chain—converts various raw materials into diverse products that are essential to modern life. Based on the product produced, the sector can be divided into five main segments, each of which has distinct characteristics, growth dynamics, markets, new developments, and issues: Basic chemicals; Specialty chemicals; Agricultural chemicals; Pharmaceuticals; Consumer products.

The Defense Industrial Base Sector is the worldwide industrial complex that enables research and development, as well as design, production, delivery, and maintenance of military weapons systems, subsystems, and components or parts, to meet U.S. military requirements.

Construction Workers, plumbers, electricians, exterminators, Warehouse operators, Workers distributing, servicing, repairing, installing residential and commercial systems.