White River Junction, VT – Investigators believe propane is to blame for a house explosion in Townshend, Vermont, last week — what do you do if you suspect a leak?

The house on Grafton Road exploded early Wednesday morning. The homeowner, away on vacation, had smelled propane in the previous few weeks, neighbors said.

The utility company had visited the home twice, but found no leaks, neighbors said.

Springfield, Vt., Fire Chief Russ Thompson said the homeowner did the right thing in calling her utility company for help.

“When you have any thought you’re smelling something wrong, it’s time to call in a professional,” Thompson said.

That professional could be either your local fire department or utility company. Both will check for a leak.

But, your nose is the first line of defense.

“Propane has an odorant added to it so that it has a very distinct foul smell,” Thompson said.

Many people say propane smells like rotten eggs or a skunk. In some cases, older people may have difficulty smelling the added odorant. Officials suggest calling for help even if there’s a slight smell, because in reality, it could be much worse. You can also purchase a propane gas detector.

What should you do if you smell propane?

Put out all flames and watch out for sparks (Stop using appliances or anything that can trigger a fire)

Leave the area immediately

Shut off the gas by turning the valve clockwise

Report the leak to the fire department or utility

Don’t return to your home until it’s safe to do so

Have your system checked to make sure it’s leak-free

“If you feel that anything is amiss, don’t be afraid to call the right people so they can come in and at least check it,” Thompson said. “There are somethings you just don’t do yourself.”

Officials also said it’s important to monitor your pilot light. If it goes out, never try to relight it yourself. Again, call a technician.