If you need help with a Nicor Gas bill, payment, moving request, payment arrangement, suspected scam, gas outage, or complaint, use the correct contact route below. A suspected leak, damaged meter, carbon monoxide concern, or interrupted service requires immediate phone contact rather than email.

Natural gas emergency: If you smell a rotten-egg odor, hear hissing, see blowing dirt or bubbling water, suspect carbon monoxide, or find a damaged gas line or meter, leave the area immediately. Do not use switches, phones, vehicles, flames, or anything that could create a spark near the suspected leak. From a safe location, call Nicor Gas at 1-888-642-6748 and call 911. Stay away until emergency personnel say it is safe to return.

Verified Nicor Gas customer service information

Customer service: 1-888-642-6748 or 1-888-Nicor4U
Customer-service hours: Monday-Friday, 7:00 a.m.-7:00 p.m. Central Time
Gas leak, odor, interruption, or emergency: 1-888-642-6748, available 24 hours a day

Email for non-emergency questions: customercare@nicorgas.com
Contact page: Nicor Gas Contact Us
Emergency information: Nicor Gas Emergency Information
Billing and payments: Nicor Gas Payment Options
Start, stop, or transfer service: Manage Nicor Gas Service
Corporate office location: Naperville, Illinois
Payment mailing address: Nicor Gas, P.O. Box 5407, Carol Stream, IL 60197-5407
Official website: NicorGas.com

Choose the correct Nicor Gas support route

Gas smell, damaged line, carbon monoxide, or interrupted service: Leave the area and call the 24-hour emergency number from a safe location.
Bill, payment, meter reading, or account question: Call customer service, sign in to My Account, or email Customer Care.

Past-due balance: Check payment-arrangement and bill-assistance options before the disconnection date.
Moving: Use the official start, stop, or transfer forms; allow processing time.
Alternate gas supplier charge: Contact the supplier about its supply charge, then contact Nicor if the issue remains unresolved.

Digging or sewer work: Call 811 before work begins.

How to Contact Nicor Gas Customer Service

Call Nicor Gas customer service at 1-888-642-6748, also written as 1-888-Nicor4U. Nicor currently lists regular customer-service hours as Monday through Friday from 7:00 a.m. to 7:00 p.m. Central Time. Customers can email customercare@nicorgas.com about non-emergency account, billing, payment, or service questions.

Do not use email for a possible leak, gas odor, damaged meter, carbon monoxide concern, interrupted service, or another urgent safety issue. Nicor instructs customers to call 1-888-642-6748 immediately from a safe location. Emergency assistance is available 24 hours a day.

Before calling about a routine account matter, gather the service address, account number, bill date, meter information, payment confirmation, bank or card record, service-request number, and any prior case numbers. Do not post this information in a public review.

Nicor Gas Leaks, Odors, Carbon Monoxide, and Emergencies

Natural gas is given a distinctive odor often compared to rotten eggs, but a leak may also be detected by hissing, blowing dirt, discolored vegetation, or bubbling water. Never search for the source or attempt a repair. Leave immediately, warn others while leaving, and keep everyone away.

Avoid using a cellphone, landline, light switch, flashlight, cigarette, flame, vehicle, garage-door opener, or electrical device while near the suspected leak. Once safely away, call Nicor Gas and 911. Do not return until emergency personnel provide clearance.

Carbon monoxide is colorless and odorless. Possible symptoms include headache, dizziness, fatigue, nausea, and vomiting. Leave the property, seek medical assistance, and call from a safe place. Do not operate damaged gas appliances until a qualified professional inspects them.

Nicor Gas Billing and Payment Options

Nicor offers online payments through My Account and Guest Pay, along with AutoPay, payments by phone, payments by mail, and authorized in-person locations. Review the official payment-options page before using a third-party service or unfamiliar payment link.

Nicor lists phone-payment assistance at 1-888-642-6748 Monday through Friday from 7:00 a.m. to 6:00 p.m., excluding holidays. These hours are narrower than its general customer-service hours. Confirm any fee before authorizing payment.

Mail bill payments with the payment stub and account number to Nicor Gas, P.O. Box 5407, Carol Stream, IL 60197-5407. This is a payment-processing address, not the Naperville corporate office and not an address for emergency correspondence.

Nicor Gas Payment Arrangements and Bill Assistance

Customers who cannot pay a bill in full may be eligible for a Deferred Payment Arrangement. A qualifying arrangement divides the past-due balance into installments after a required down payment while the customer continues paying current monthly charges.

The Nicor Gas bill-assistance page includes programs such as LIHEAP, PIPP, Sharing, Energy Aide, Shield of Caring, weatherization, and community-agency resources. Eligibility, funding, income limits, application periods, and required documents vary.

The Budget Plan spreads estimated annual gas costs across monthly payments. Nicor periodically reviews usage and gas prices, so the budget amount can change. Customers generally must have a current account or establish an eligible payment arrangement before enrolling.

Start, Stop, or Transfer Nicor Gas Service

Use Nicor’s start, stop, and transfer service page when moving or establishing an account at a property with an existing gas meter. Customers who need a new service line, new meter, commercial service, or landlord arrangement should select the specialized form for that request.

Submit moving requests early. Nicor says some start-service requests can take up to 48 hours to process and same-day requests are unavailable. Access to the property or appliances may be required depending on whether gas service is already on.

Nicor Gas and Customer Select Suppliers

Nicor Gas distributes natural gas and maintains the delivery system throughout its service territory. Under Customer Select, an approved alternate supplier may provide the gas supply portion of the service. Depending on the arrangement, supplier charges may appear on the Nicor bill or on a separate bill.

Call the alternate supplier about its rate, contract, early-termination fee, or supply charge. Call Nicor for delivery, meter, service, safety, or emergency issues. If a supplier billing problem remains unresolved, Nicor says customers can contact its Customer Service Center for further assistance.

Nicor Gas scam warning: Be cautious if a caller threatens immediate disconnection and demands payment through gift cards, cryptocurrency, wire transfer, a payment app, or an unfamiliar website. Do not provide account or payment information to an unexpected caller. Hang up and call Nicor directly at 1-888-642-6748 using the number on the official website or bill.

How to Escalate a Nicor Gas Complaint

Call customer service and explain whether the problem involves billing, payment posting, service, a meter, a supplier, or a previous request.

Ask for a case or reference number and note the representative’s name, date, time, and promised next step.
Save bills, payment confirmations, meter photos, emails, service notices, supplier agreements, and previous case records.
Email Customer Care for a written record when the issue is not an emergency.

For an alternate supplier dispute, contact the supplier first and preserve its response.
If a regulated utility dispute remains unresolved, review the current complaint process offered by the Illinois Commerce Commission.

Nicor Gas Customer Service Reviews and Complaints

This CustomerServiceNumbers.com page currently has 0 published Nicor Gas reviews. There is no reliable star-rating pattern or customer complaint theme to summarize. New firsthand reviews can help readers understand experiences involving billing, payments, service transfers, payment arrangements, meter issues, supplier charges, emergency response, and customer-service follow-up.

Reviews posted here are public and are not sent directly to Nicor Gas, Southern Company Gas, an alternate supplier, or a regulator. Do not post an account number, service address, payment information, phone number, email address, meter identifier, disconnection notice, or other private information.

Related Utility Customer Service Pages

Nicor Gas Customer Service Frequently Asked Questions

What is the Nicor Gas customer service number?

Call 1-888-642-6748, also written as 1-888-Nicor4U.

What are Nicor Gas customer-service hours?

Regular customer service is available Monday-Friday from 7:00 a.m. to 7:00 p.m. Central Time. Gas emergency assistance is available 24 hours a day.

What should I do if I smell gas?

Leave immediately without using switches, phones, vehicles, or anything that could create a spark. From a safe location, call Nicor Gas at 1-888-642-6748 and call 911.

Can I email Nicor Gas about a leak?

No. Nicor specifically instructs customers not to email about leaks, gas odors, interruptions, or emergencies. Call the 24-hour emergency number from a safe location.

Where do I mail my Nicor Gas payment?

Mail payments to Nicor Gas, P.O. Box 5407, Carol Stream, IL 60197-5407. Include the payment stub and account number.

Can CustomerServiceNumbers.com change my Nicor Gas account?

No. CustomerServiceNumbers.com is an independent information and review website and cannot access accounts, restore service, process payments, change suppliers, approve assistance, or dispatch emergency crews.

Why Trust This Nicor Gas Customer Service Update?

This page uses Nicor Gas’s current contact, emergency, billing, payment, service-change, assistance, supplier, and fraud information, along with the reviews actually published on this CSN page. Contact information and related links were checked in August 2026.

Share Your Nicor Gas Customer Service Experience

If you have firsthand experience with Nicor Gas customer service, leave a review below. Include the approximate date, type of issue, support route, and outcome while removing all account, address, meter, and payment information.

Updated: August 17, 2026

Independent-site disclaimer: CustomerServiceNumbers.com is not affiliated with Nicor Gas, Southern Company Gas, Southern Company, any alternate gas supplier, or the Illinois Commerce Commission. Contact details, programs, rates, policies, and assistance requirements can change. Verify current information directly with Nicor Gas, the supplier, or the appropriate agency before acting.

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Nicor Gas Customer Service, Emergency, Billing and Reviews