What is a common sign of a gas leak?

The smell of rotten eggs is commonly associated with a gas leak because utility companies often add a chemical called mercaptan to natural gas, which is otherwise odorless. This distinct odor serves as a safety measure to alert individuals to the presence of gas, allowing them to take immediate action to minimize danger. Recognizing this smell is crucial for individuals working with or around gas systems, as it indicates a potentially hazardous situation that requires prompt attention.

A hissing sound near gas appliances can also suggest a gas leak, but it is not as easily recognizable or consistent as the smell of rotten eggs. Unusually high utility bills may indicate a leak, but they could also result from various other factors such as increased usage or rate changes, making them less definitive for identifying a leak. Fluctuating water pressure does not typically have a direct correlation with gas leaks and relates more to plumbing issues than gas safety. Thus, the distinct rotten egg odor remains the primary and most effective sign of a gas leak.