Even if a professional plumber installed your gas lines, they could still leak because of damage, age, or shifting soil. Many homeowners, unfortunately, don't realize there's a problem until it's too late. If you suspect you have a gas leak, take the following steps to ensure the safety of your family and your property. Get out of the house quickly Don't use any electrical devices or turn on any electric items Leave your doors and windows open to allow gas to escape Call the gas company, 911, and a plumber If you feel nauseated, lightheaded, have a headache, blurred vision, dizzy, or any other symptom associated with carbon monoxide poisoning, seek medical attention immediately