- Combination Utilities, NEC
– sic code 4939 / 40 companies - Electric and Other Services Combined
– sic code 4931 / 5 companies - Electric Services
– sic code 4911 / 194 companies - Gas and Other Services Combined
– sic code 4932 / 9 companies - Irrigation Systems
– sic code 4971 / 23 companies - Mixed, Manufactured, or Liquefied Petroleum Gas Production and/or Distribution
– sic code 4925 / 32 companies - Natural Gas Distribution
– sic code 4924 / 45 companies - Natural Gas Transmission
– sic code 4922 / 49 companies - Natural Gas Transmission and Distribution
– sic code 4923 / 34 companies - Refuse Systems
– sic code 4953 / 310 companies - Sanitary Services, NEC
– sic code 4959 / 41 companies - Sewerage Systems
– sic code 4952 / 27 companies - Steam and Air-Conditioning Supply
– sic code 4961 / 8 companies - Water Supply
– sic code 4941 / 50 companies