This major group includes establishments engaged in the generation, transmission, and/or distribution of electricity or gas or steam. Such establishments may be combinations of any of the above three services and also include other types of services, such as transportation, communications, and refrigeration. Water and irrigation systems, and sanitary systems engaged in the collection and disposal of garbage, sewage, and other wastes by means of destroying or processing materials, are also included. If one service of a combination system does not constitute 95 percent or more of revenues, the establishment should be classified as a combination in Industry Group 493, with the subgroup being determined by the major service supplied.
Industry Group 491: Electric Services
·4911 Electric Services
Industry Group 492: Gas Production And Distribution
·4922 Natural Gas Transmission
·4923 Natural Gas Transmission and Distribution
·4924 Natural Gas Distribution
·4925 Mixed, Manufactured, or Liquefied Petroleum Gas Production and/or
Industry Group 493: Combination Electric And Gas, And Other Utility
·4931 Electric and Other Services Combined
·4932 Gas and Other Services Combined
·4939 Combination Utilities, Not Elsewhere Classified
Industry Group 494: Water Supply
·4941 Water Supply
Industry Group 495: Sanitary Services
·4952 Sewerage Systems
·4953 Refuse Systems
·4959 Sanitary Services, Not Elsewhere Classified
Industry Group 496: Steam And Air-conditioning Supply
·4961 Steam and Air-Conditioning Supply
Industry Group 497: Irrigation Systems
·4971 Irrigation Systems

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