Detecting A Leak

If you suspect a gas leak inside your home or business and cannot shut off the gas, immediately evacuate the area and contact 911. Common signs of a gas leak include:

Smell illustration graphic

Odor of rotten eggs. The nose knows.

Hearing illustration graphic

An unusual hissing or blowing noise from a gas appliance, the ground or exposed gas piping.

Dollar sign illustration graphic

A sudden and unexplained increase in gas consumption on your gas bill.


• Constant and localized blowing of dirt, dust or debris.

• Flames near exposed piping or coming from the ground. Appliance flames that are behaving in an unusual way.

• Rapid bubbling at the surface of a body of water such as a puddle.

• Unusual brown, dying or dead vegetation in otherwise moist areas over or near pipeline areas as well as unusual soil movement.

• Damaged connections to gas appliances.

• Exposed pipeline after an earthquake, fire, flood or other disaster.

What To Do And Not Do If You Detect A Gas Leak

• Immediately put out all smoking materials and other open flames.

• Turn off machinery and engines and don’t use cell phones or electrical switches.

• Turn off the gas at the tank or appliance if it is accessible and safe to do so.

• Ventilate the area by opening windows if indoors.

• If the leak is outside and underground, do not fill the hole with water.

• If there is a gas fire, do not try to extinguish it unless you are able to shut off the source of the gas.

• Immediately leave the area and warn others to stay away.

• Call the Hawaiʻi Gas office nearest you if there is no immediate danger or call 911.

• Do not attempt to turn the gas back on by yourself – contact Hawaiʻi Gas to have a trained, qualified energy professional restore your service.

• DO NOT rely on your sense of smell alone to detect the presence of natural gas or propane gas.

• When installing gas appliances or equipment, the manufacturer's instruction manual should be followed in accordance with the local code authority.

Excess Flow Valves (EFV)

EFVS valve types.

Hawaiʻi Gas (HG) customers can purchase an excess flow valve (EFV) for their home or business. If you are interested in obtaining more information on EFVs, please contact your local HG branch. Certain eligibility limitations may apply.

Exess flow gas valves.

What is an EFV?

An EFV is a device that’s designed to automatically restrict the flow of gas if your service line fails or an overpressure surge occurs.

Where is an EFV installed?

An EFV is installed on the service pipeline that runs underground between the gas main in the street and the meter on your property.

Benefits of an EFV

An EFV can restrict gas flow when an excavator accidentally hits a service line. Likewise, if a meter is damaged during a car crash or similar incident, an EFV can restrict the flow of gas. This helps to reduce the chance of a gas related damage or injury.

How does the Installation Process Work?

If you are interested in having an EFV installed on your service pipeline for your home or business, contact your local HG branch to get started. Please note customers requesting this upgrade will be responsible for all costs associated with the installation and maintenance. Installation typically involves digging up the service pipeline, installation of the EFV, and any paving or concrete work as required. Restoration of any paving or concrete work will be scheduled at a later date. Please note it is possible gas service may be interrupted during installation of the EFV. Hawaiʻi Gas will coordinate with you to schedule the installation and any follow up work.

What is the Cost to Install an EFV?

The cost to install an EFV at your home or business may range from $2,500 to $7,500, or more, based on specific site conditions. An estimate can be provided to you.

Receive the Good Energy Connections Newsletter