Here are a few signs that can help you to identify a gas leak: DEAD PLANTS. HISSING SOUND. ROTTEN EGG SMELL. SMALL BUBBLES. WHITE MIST OR FOG. HIGHER THAN NORMAL GAS BILLS. HEALTH CONCERNS. Click to see full answer. Similarly, you may ask, is a small gas leak dangerous?When installed and used correctly, natural gas is safe and convenient. But gas leaks can occur. These leaks can lead to physical symptoms and, in some cases, the gas can cause carbon monoxide poisoning in people and animals. It is highly flammable, and gas leaks increase the risk of fire and explosion.Secondly, what does a gas leak sound like? Indoor Signs of a Gas Leak Known as mecaptan or methanethiol, this substance is harmless but pungent-smelling; it is often described as having an odor like rotten eggs or rotting cabbage. Hissing sound: A hissing sound coming from the area around a gas appliance is often a sign of a gas leak. Also, what are the signs of a gas leak in your home? Gas leak signs in the home the smell of sulfur or rotten eggs. a hissing or whistling sound near a gas line. a white cloud or dust cloud near a gas line. bubbles in water. a damaged gas pipe. dead houseplants. Does gas company charge to check for leaks?Average Costs. The gas company will respond to you immediately and at no charge. Their job is to make sure you’re safe. The price to fix the leak depends on the type of leak and your geographic location.