General and special trade contractors primarily engaged in the construction of water and sewer mains, pipelines, and communications and power lines.
- Aqueduct construction-general contractors
- Cable laying construction-contractors
- Cable television line construction-contractors
- Conduit construction-contractors
- Distribution lines construction, oil and gas field-general contractors
- Gas main construction-general contractors
- Manhole construction-contractors
- Natural gas compressing station construction-general contractors
- Pipelaying-general contractors
- Pipeline construction-general contractors
- Pipeline wrapping-contractors
- Pole line construction-general contractors
- Power line construction-general contractors
- Pumping station construction-general contractors
- Radio transmitting tower construction-general contractors
- Sewage collection and disposal line construction-general contractors
- Sewer construction-general contractors
- Telegraph line construction-general contractors
- Telephone line construction-general contractors
- Television transmitting tower construction-general contractors
- Transmission line construction-general contractors
- Water main line construction-general contractors