City of Ellensburg issued the following announcement on Feb 18.
Smell gas, act fast! If you detect a rotten egg smell, it could be a natural gas leak.
If you think you smell natural gas indoors:
• Open doors and windows
• Do not smoke, light matches, operate electrical switches, or create any other source of ignition
• Leave the premises immediately
• If you know how, turn off your gas meter
• Go to a nearby phone and call your natural gas utility at (509) 962-7124 or call 911.
Original source can be found here.