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Natural Gas Terms


The mainline is usually located under the street or in the tree lawn area and transports gas to the service line.

Service Line

The service line runs from the mainline to meter.

House Line

The house line runs from your meter into the building and branches off to other pipes that are connected to appliances or equipment.

  • Dominion is responsible for the maintenance and repairs of the mainline and service line.
  • Customers are responsible for maintenance and repairs of the house line.

The following information is for gas line installers performing work in Dominion Energy's Ohio Gas Operations service territory. For questions on installing gas service in Dominion Energy's Ohio gas service territory, call 888-619-0786.

Dominion Energy Ohio is currently responsible for the installation of all residential, commercial and industrial gas service lines (from the street to the gas meter) at no cost to the customer.

At this time, developers, builders and customers do not have the option to hire a contractor of their choice to install the gas service line. However, Dominion Energy Ohio will honor service agreements received prior to October 1, 2016.

If you have any questions or need further information, please contact Dominion Energy Ohio at 888-619-0786 between 7 AM and 7 PM Monday through Friday, or via email at

House Line Installation Standards

With the passage of the Ohio Minimum Service Standards for Natural Gas Customers, Service Line Installers will be required to provide proof that the house line has been tested at a minimum of 1-1/2 times the operating pressure, but not less than 3 lbs., for 10 minutes. To accomplish this, a new form, the Houseline Installation Record (HIR), is being introduced.

All house piping installed in Dominion Energy's service territory shall be installed in accordance with the "National Fuel Gas Code" (NFPA 54) and/or the "International Fuel Gas Code," latest editions.

Copies of the National Fuel Gas Code may be obtained by contacting:

National Fire Protection Association
1 Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9101

Copies of the International Fuel Gas Code may be obtained by contacting:

International Code Council
500 New Jersey Avenue, NW, 6th Floor
Washington, DC 20001
Phone: 888-ICC-SAFE (422-7233)
Fax: 202-783-2348
International: 202-370-1800

Call Before You Dig

By law, everyone must contact the Ohio Utility Protection Service (OUPS) at 811 at least two, but no more than ten working days before beginning a digging project of any type. Once contacted, an OUPS member will attempt to mark utility lines prior to excavation. This is a free service.

Additional Information



Notice to Qualified Service Line Installers, February 23, 2009

This notice includes:

  • Natural Gas Service Lines – New Service Installation Requirements

Notice to Qualified Service Line Installers, October 15, 2008

This notice includes:

  • Natural Gas Service Lines – Ownership Transfer
  • Houseline Installation Record – Revised Form

Notice to Qualified Service Line Installers, February 1, 2008

This notice includes:

  • Houseline Pressure Testing required by the Ohio Minimum Service Standards (OMSS)
  • Revised “Service Installation Record” – Dominion Form #723231
  • Reminder Regarding Atmospheric Corrosion Prevention on Exposed Metal Piping
  • Meter Bar Requirements
  • Tracer Wire Installation Changes

Why Natural Gas?

Natural Gas provides an affordable and clean-burning fuel to heat our homes, cook our meals, and run our factories.

We operate one of the largest Energy Choice programs in the U.S. Through Energy Choice, eligible customers may buy their natural gas from another supplier, then have it delivered by Dominion Energy Ohio. This option allows our customers to select a supplier that offers the most value for their money. The actual amount of savings will vary depending upon the selected supplier, the amount of natural gas used, and the price of natural gas in the future.

Energy Choice customers can remain as customers of Dominion Energy Ohio.

We continue to:

  • Deliver natural gas to homes and businesses
  • Provide meter reading, billing and customer service work
  • Respond to emergency situations and provide back up natural gas supplies, so customers never have to worry about an interruption of gas supplies
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