Evanston IL:Who do I contact if there is a gas leak?
From PublicStuff Knowledge Base
If you believe you may have a gas leak, please contact 911 immediately to report it.
After reporting a suspected gas leak to 911, from a safe location you may call Nicor direct at 1-888-Nicor4U (1-888-642-6748) to discuss the leak or any other gas emergency.