Pipeline Safety

Doing your part to recognize and report potential natural gas leaks will keep us all safe.
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Underground pipelines can be located anywhere

They can be found under public roads, railroads, street intersections, open fields, and on private property.  For your protection, line markers are used to indicate the pipeline’s approximate location. 
Calling 811 is still required for marking the pipelines before digging.


  • Are yellow
  • Are typically seen where a pipeline intersects a street, highway or railway
  • Are not required for all pipeline facilities
  • Do not indicate the pipeline’s depth or exact location
  • List emergency telephone numbers in case of a natural gas emergency

Make sure markers are left undisturbed to serve as a reminder that natural gas lines are in the area. Additionally, below-ground markers, such as yellow tape or mesh, may be present to warn excavators to the presence of buried pipe. If this below-ground marking tape is encountered, stop work immediately and call Southwest Gas.
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A right-of-way is a strip of land where some of the property owner’s legal rights have been granted to a utility company. By definition, pipeline rights-of-way allow the pipeline operator to inspect, repair, maintain, or replace pipeline on property owned by others. Pipeline markers are often placed along the rights-of-way to indicate the pipeline’s location. 

Why are rights-of-way important to you?

Encroachments into the rights-of-way can cause unsafe conditions. When a pipeline is accidently damaged by excavation and other construction activities, outages, impaired access, excessive/dangerous loads on the pipeline, and evacuations can occur.

Safety of the rights-of-way can be promoted by:

  • Calling 811 to get utility-owned underground lines marked before excavation.
  • Using safe excavation practices.
  • Monitoring and reporting suspicious activity on the rights-of-way.
  • Keeping rights-of-way free from obstructions.
  • Following recommended practices on land use near the rights-of-way.
The Southwest Gas service territory map provides general locations of our transmission pipelines. Lower pressure distribution mains and service lines connected to the gas meter at homes and businesses are not shown.
To locate natural gas transmission lines operated by Southwest Gas and other companies, visit the U.S. Department of Transportation’s Pipeline Mapping System (NPMS) website.

Transmission Integrity
Management Program

Southwest Gas has developed its transmission integrity management program (TRIMP) to comply with the requirements of the U.S. Department of Transportation regulation §49 CFR Part 192, Subpart O ­Gas Transmission Pipeline Integrity Management. This comprehensive program has been designed to ensure the integrity of gas transmission pipelines.

The program addresses pipelines located in areas where people gather, called high consequence areas (HCAs). Pipelines within HCAs are inspected beyond normal levels of operations and maintenance. These inspections, called assessments, are repeated on a regular interval, for an increased level of proactive awareness and maintenance.
Southwest Gas continually collaborates with local emergency response officials through regular meetings, participation in emergency response drills, and ongoing review of deployment practices. This allows each organization to refine safety procedures, and coordinate how to respond with others involved more effectively in the event of a natural gas incident or emergency. Additionally, Southwest Gas provides ongoing pipeline safety training to our employees and contractors.

If you'd like to schedule a meeting, a joint emergency response drill, or would like more information about training, please call 800-654-2765.
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How to recognize a natural leak

Learn the signs of a natural gas leak and what to do if you suspect one. 

Material Safety Data Sheet

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To help you identify and understand the procedures and proper handling of odorized natural gas, Southwest Gas has prepared Material Safety Data Sheets (MSDS).


Check out our informative video to learn the basics of natural gas safety.