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NAICS Code 237990-02 Description (8-Digit)

Tunneling Contractors are companies that specialize in the construction of tunnels for various purposes such as transportation, water supply, sewage systems, and mining. These contractors are responsible for the excavation, support, and lining of tunnels, as well as the installation of necessary infrastructure such as lighting, ventilation, and drainage systems. Tunneling Contractors work in a variety of environments, including urban areas, mountains, and underwater.

Hierarchy Navigation for NAICS Code 237990-02


Tools commonly used in the Tunneling Contractors industry for day-to-day tasks and operations.

  • Tunnel Boring Machines (TBMs)
  • Drilling Rigs
  • Excavators
  • Loaders
  • Dump Trucks
  • Concrete Sprayers
  • Shotcrete Machines
  • Grout Pumps
  • Jackhammers
  • Surveying Equipment
  • Laser Scanners
  • Ground Penetrating Radar (GPR)
  • Tunnel Lining Machines
  • Ventilation Fans
  • Water Pumps
  • Welding Equipment
  • Hydraulic Power Units
  • Compressors
  • Generators

Industry Examples of Tunneling Contractors

Common products and services typical of NAICS Code 237990-02, illustrating the main business activities and contributions to the market.

  • Subway Tunneling
  • Water Tunneling
  • Sewer Tunneling
  • Mining Tunneling
  • Hydroelectric Tunneling
  • Road Tunneling
  • Railway Tunneling
  • Utility Tunneling
  • Pipeline Tunneling
  • Cavern Excavation

Certifications, Compliance and Licenses for NAICS Code 237990-02 - Tunneling Contractors

The specific certifications, permits, licenses, and regulatory compliance requirements within the United States for this industry.

  • OSHA 30-Hour Construction Certification: This certification is required for all workers in the construction industry, including tunneling contractors, who work on sites with more than 10 employees. It covers topics such as hazard recognition, fall protection, and electrical safety. The certification is provided by the Occupational Safety and Health Administration (OSHA).
  • Mine Safety and Health Administration (MSHA) Certification: This certification is required for tunneling contractors who work in mines or other underground facilities. It covers topics such as mine ventilation, roof control, and emergency procedures. The certification is provided by the Mine Safety and Health Administration (MSHA).
  • National Institute for Occupational Safety and Health (NIOSH) Certification: This certification is required for tunneling contractors who work with hazardous materials or in hazardous environments. It covers topics such as respiratory protection, chemical exposure, and radiation safety. The certification is provided by the National Institute for Occupational Safety and Health (NIOSH).
  • American Welding Society (AWS) Certification: This certification is required for tunneling contractors who perform welding work. It covers topics such as welding safety, welding techniques, and welding codes and standards. The certification is provided by the American Welding Society (AWS).
  • National Commission for the Certification Of Crane Operators (NCCCO) Certification: This certification is required for tunneling contractors who operate cranes or other heavy equipment. It covers topics such as crane safety, load charts, and rigging techniques. The certification is provided by the National Commission for the Certification of Crane Operators (NCCCO).


A concise historical narrative of NAICS Code 237990-02 covering global milestones and recent developments within the United States.

  • The history of tunneling contractors dates back to ancient times when tunnels were dug for irrigation, transportation, and military purposes. The first recorded tunnel was built in Egypt around 2000 BC to divert water from the Nile River. In the 19th century, the Industrial Revolution brought significant advancements in tunneling technology, including the invention of the tunneling shield, which allowed for the construction of larger tunnels. In the United States, the construction of the first transcontinental railroad in the mid-1800s required extensive tunneling through the Sierra Nevada Mountains. In recent history, tunneling contractors have been involved in several high-profile projects, such as the construction of the Channel Tunnel between England and France and the expansion of the Panama Canal. In the US, notable projects include the construction of the Lincoln Tunnel in New York City and the Big Dig in Boston, which involved the construction of a tunnel to reroute a major highway through the city.

Future Outlook for Tunneling Contractors

The anticipated future trajectory of the NAICS 237990-02 industry in the USA, offering insights into potential trends, innovations, and challenges expected to shape its landscape.

  • Growth Prediction: Stable

    The future outlook for the Tunneling Contractors industry in the USA is positive due to the increasing demand for infrastructure development and maintenance. The industry is expected to grow as the government continues to invest in transportation infrastructure, including tunnels for highways, railroads, and subways. Additionally, the industry is expected to benefit from the growing demand for renewable energy infrastructure, such as tunnels for hydroelectric power plants and geothermal energy systems. However, the industry may face challenges due to the high cost of tunneling projects and the potential for delays and cost overruns. Overall, the industry is expected to experience steady growth in the coming years.

Industry Innovations for NAICS Code 237990-02

Recent groundbreaking advancements and milestones in the Tunneling Contractors industry, reflecting notable innovations that have reshaped its landscape.

  • The use of tunnel boring machines (TBMs) has revolutionized the tunneling industry, allowing for faster and more efficient excavation of tunnels. TBMs are now commonly used in tunneling projects around the world.
  • The development of new tunneling materials, such as high-strength concrete and advanced steel alloys, has improved the durability and safety of tunnels.
  • The use of computer-aided design (CAD) and building information modeling (BIM) software has improved the accuracy and efficiency of tunnel design and construction.
  • The implementation of safety measures, such as ventilation systems and emergency response plans, has improved the safety of tunnel workers and users.
  • The adoption of sustainable tunneling practices, such as the use of renewable energy sources and the recycling of tunneling materials, has reduced the environmental impact of tunneling projects.

NAICS Code 237990-02 - Tunneling Contractors

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