A few examples of gas leaks that you should be concerned about are when gas is coming out of piping, commonly found in older home and cause rust to form. Another common but serious gas leak can be found with kitchen islands. Gas leaks escaping from the valves should be repaired immediately. No matter where you believe the gas leak is coming from, if you smell gas you should immediately call a certified plumbing professional to come to your home and further assess the gas leak.