Gas Smell Protocol
If you smell gas—often like rotten eggs—evacuate immediately, avoid sparks, and call the utility before reentering.
The natural gas utility in most of Boston is National Grid. If you smell gas—especially a strong rotten egg odor—get everyone outside quickly, even if the smell seems faint. Do not turn lights on or off, use phones indoors, or operate any electrical appliance, including garage door openers. Even a small spark can ignite gas. Once safely away, call National Grid’s emergency line at 1-800-424-4269. Their crews respond 24/7.
If the smell is mild or intermittent, still treat it as serious. Open windows only after evacuating, and do not reenter until the utility confirms it’s safe. In older neighborhoods, aging underground pipes can develop leaks, especially after freeze-thaw cycles or construction nearby. Plumbers in our network are trained to work with utilities and can inspect or repair lines once the gas is confirmed off.
Never attempt to locate or fix a gas leak yourself—even experienced homeowners risk explosion or exposure. Our dispatch team can tell you how to confirm your gas provider (some South Shore towns use Cape Cod Gas or Eversource), where the meter is, and what to say when calling. Keep that number taped near your meter. If someone feels dizzy or ill, call 911 first before contacting the utility.
