United Mechanical Services, Inc.
United Mechanical Services, Inc.

Smell Gas?

Natural gas is odorless, colorless, non-toxic and has no taste in its natural state. To make it easy to detect even the smallest leak, the suppliers of this fuel add a harmless chemical—mercaptan—which smells like sulfur or rotten eggs.

Review and familliarize yourself with the following things to do if you smell natural gas.


  • DO open Windows.
  • DO leave the building.
  • DO use a neighbor's phone to call Puget Sound Energy (day or night):
    425-454-2000; 1-888-CALL-PSE;


  • DO NOT turn on or off any electrical switches.
  • DO NOT use your phone.
  • DO NOT smoke.
  • DO NOT light a match or do anything that might create sparks.

Using your nose is not the only way to detect a natural gas leak. Dirt blowing, bubbles in a puddle or a hissing sound may indicate a leak in a service line. If you notice any indication of a gas leak, immediately call PSE!

Call Before You Dig

If you are planning to dig to a depth of 12" or more, even on your property, Washington State law requires you to notify the Utilities Underground Location Center. Call 1-800-424-5555 at least two business days before you dig. Each untility will come out to mark the location of it's underground utilities with the following colors:

  • yellow - fuel (natural gas or oil)
  • red - electric
  • orange - telephone or cable
  • blue - water
  • green - sewer

The Call Before You Dig program is a free service provided by your local utilities.

All of the above information was taken directly from Puget Sound Energy Safety Quiz Form #1611 11/97 650M. Call them for your own copy which includes a sample natural gas scratch and sniff.

8901 Willows Rd. Redmond, WA, 98052 • Phone (425) 885-9100 • Fax (425) 881-6487
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