Even gas lines installed by professionals are prone to leaks because of age, moving soil conditions, damage, and tree roots. Sometimes, homeowners don't know they have a gas leak until it's too late. If you know the signs of gas leaks, and you detect them, here are the proper steps to take to ensure everyone's safety. Get out of the house quickly. Don't use any electrical devices or turn on any electric items in the house. Leave your doors and windows open to allow gas to escape. Call the gas company, emergency services, 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.