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Last update on December 11, 2025

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American Leak Detection - Montana

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American Leak Detection - Montana

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23 years of experience

LEAK DETECTION WITHOUT DESTRUCTION, REPAIR SWIMMING POOL, SLAB, SEWER LEAKS, SPRINKLER SYSTEMS, SWIMMING POOL CRACK INJECTION, CONCEALED PLUMBING SYSTEMS.

LEAK DETECTION WITHOUT DESTRUCTION, REPAIR SWIMMING POOL, SLAB, SEWER LEAKS, SPRINKLER SYSTEMS, SWIMMING POOL CRACK INJECTION, CONCEALED PLUMBING SYSTEMS.

Gas Leak Repair questions, answered by experts

In North America, pipe measurements are listed as the nominal pipe size (NPS). This measurement refers to the outside diameter. As an example, a 1/2-inch copper pipe has an outside diameter of 5/8 of an inch. If a hardware store lists a pipe as having a 2 NPS, it means that all the pipes with this measurement have a 2 ⅜-inch outside diameter, regardless of wall thickness and inside diameter.

It's not hard to replace a gas line, but it requires a pro’s knowledge and expertise. Replacing a gas line becomes more time-consuming and costly if you need to excavate the area to access a gas line underground.

The cost of repairing a gas leak depends on the type of leak, its severity, and how difficult it is for the repair technician to reach it. Some of the most common gas line repair costs, on average, include:

  • Cap a gas line: $75–$150

  • Gas system inspection: $150

  • Pressure test: $75–$500

  • Damaged or corroded pipe: $6–$7 per linear foot

  • Repair gas leak: $120–$5,000

You can and should vent the gas from your hot water heater to the outside of your home. Traditionally, these gases were vented back to other gas appliances, like stoves or furnaces, but many jurisdictions have outlawed this practice due to the risks it provides. 

Most water heaters today use atmospheric venting that exhausts the gas out of the home through a pipe.

Consider an annual inspection conducted by a local plumber to prevent dangerous and destructive leaks. If you recently moved into an older home or are concerned about the age of your gas lines, call an inspector for a closer look. You may also be required to call an inspector after your contractor installs a new line for an appliance.

The Forsyth, MT homeowners’ guide to gas leak repairs

From average costs to expert advice, get all the answers you need to get your job done.

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