Although gas leaks occur infrequently, here's how you can tell if there is a leak:
Naturally, gas is odourless. To help customers detect leaks, a special odorant is added to the gas so that even small leaks can be detected quickly.
An unusual noise from your appliance, or a hissing sound from piping or connections may also indicate a gas leak.
A gas leak may also be detected by unusual flame behaviour at an appliance burner. On the outside of the appliance, black or brown scorched areas. Although rare, a fire in or near a gas appliance or piping are also signs of a leak. Fire near pipeline, a white cloud or fog, dying plants in a pattern amid healthy ones, persistent bubbles in water.
A sudden increase in your gas consumption may indicate a leak in your gas appliances or piping. Check your gas bill and see if it is higher than normal.