Excess Flow Valves

Excess Flow Valves

Learn more about Excess Flow Valves

We take a number of steps to help ensure safe, reliable natural gas service to your home and business:
  • Regularly inspecting natural gas equipment and rights-of-way
  • Systematically updating and modernizing our system
  • Monitoring operations 24 hours a day, seven days a week
  • Adding odorant to natural gas to produce a “rotten egg” smell if a leak occurs
  • Working with first responders to be prepared for emergencies
  • Reminding everyone to always call 811 before digging
We also want you to know about Excess Flow Valves (EFVs), which are an additional safety measure that may be installed on certain underground service lines running between the natural gas main (typically located in or near the street, alley or easement) and your gas meter.  

What are EFVs designed to do?
EFVs are designed to automatically restrict the flow of natural gas if a service line is damaged or broken. Although not necessary for the normal, safe operation of a service line, a potential safety benefit is that EFVs automatically minimize or shut off gas flow if a service line is damaged or broken.

Has Columbia Gas of Virginia been installing EFVs on its service lines?
As part of our regular system maintenance and upgrade programs, Columbia Gas of Virginia has been installing EFVs on all eligible new and replacement service lines since 1994. We also install EFVs as we replace eligible service lines as part of our ongoing system enhancement programs.

How do I know if I have an EFV on my service line?
If your natural gas service line was installed after 1994, it’s likely that you already have an EFV in place. If you would like to confirm that you have an EFV on your service line, please call us at 1-800-543-8911.

If my service line does not have an EFV, can I get one installed now at my own expense?

Although an EFV is not necessary for the normal, safe operation of a gas service line, customers may have one installed on an eligible service line at their own expense. The tariff rate for the installation of an EFV is $1,600.  This includes work time, materials, excavation and any necessary site restoration activities. If you contact us at 1-800-543-8911, we can assist you in determining if your service line is eligible for installing an EFV.  If you decide to proceed with installation of an EFV and meet the eligibility guidelines below, we will work with you to provide it at a mutually agreeable date.  

Which service lines are eligible for an EFV?
Many service lines are eligible for an EFV, but here are some conditions under which we would not install an EFV:
  • Gas deliveries on the line exceed 1,000 standard cubic feet per hour
  • The line does not operate at a pressure of 10 pounds per square inch gauge or greater throughout the year
  • There have been contaminants in the gas stream that could interfere with the EFV's operation or cause loss of a service to the customer
  • An EFV could interfere with necessary operation or maintenance activities
  • An EFV meeting regulatory performance standards is not commercially available
Am I responsible for maintaining the EFV?
No. Once installed, the cost to maintain and replace an EFV is the responsibility of Columbia Gas of Virginia.

Where can I learn more?
This notice is being provided pursuant to a federal rule. If you are interested in learning more please call us at 1-800-543-8911.