- Developed in the 1930s, the Standard Industrial Classification (SIC) code is a 4-digit scheme that organizes 1,004 industries. Some 400 of these are services.
- Developed in 1997, the North American Industrial Classification System (NAICS), is a six-digit scheme that organizes 1,170 industries, of which 565 are services. Many of the NAICS industries emerged over the past 20 years.
For more information, see:
- 2007 NAICS Definition. 237110. Water and Sewer Line and Related Structures Construction.
"This industry comprises establishments primarily engaged in the construction of water and sewer lines, mains, pumping stations, treatment plants, and storage tanks. The work performed may include new work, reconstruction, rehabilitation, and repairs. Specialty trade contractors are included in this group if they are engaged in activities primarily related to water, sewer line, and related structures construction."
- 2007 2007 NAICS Definition. 238290. Other Building Equipment Contractors
"This industry comprises establishments primarily engaged in installing or servicing building equipment (except electrical, plumbing, heating, cooling, or ventilation equipment). The repair and maintenance of miscellaneous building equipment is included in this industry. The work performed may include new work, additions, alterations, maintenance, and repairs."