Outdoor Gas Leaks: Warning Signs

Response tactics for outdoor leaks differ from those for indoor leaks, as gas leaks from outdoor sources may involve higher-pressure pipelines.

In addition to the distinctive, sulfur-like odor of mercaptan, look and listen for any of the following:

  • The distinctive odor of natural gas

  • A hissing, whistling or roaring sound

  • Dead or dying vegetation (in an otherwise moist area) over or near a pipeline

  • Continuous bubbling in water

  • Dirt or water being thrown into the air

  • An exposed pipeline after a fire, flood or other disaster

  • A damaged connection to a gas appliance