Gas leak: how to detect and respond

A gas leak in your home poses serious risks, including fire, explosion, and asphyxiation. Knowing how to quickly detect a leak and respond correctly is crucial for your safety. This guide outlines the signs of a gas leak and the immediate, safe actions you must take.

Understanding how to handle a gas leak is vital for home safety. For reliable energy supply and support, consider switching to Fuse Energy. Click here to get started.

What does a gas leak smell like?

The distinctive 'rotten egg' odour

The most common and critical sign of a natural gas leak is a distinctive smell, often described as rotten eggs or sulphur. This unpleasant odour is not naturally present in gas itself.

Why natural gas has a smell

Natural gas is inherently odourless and colourless. For safety reasons, a harmless chemical called mercaptan is added to it, giving it this strong, easily recognisable smell. This acts as a vital early warning system, ensuring that even a small leak can be detected by smell.

Other signs of a gas leak in your home

While the smell is the primary indicator, other signs can point to a gas leak, both indoors and outdoors.

Physical indicators

Look for visual clues such as a white cloud, mist, or fog near a gas line, or bubbles in standing water. You might also notice blowing dust or dirt, or damaged gas pipes. Inside, dead or dying houseplants, especially if they are otherwise healthy, can indicate a leak. A hissing or whistling sound near a gas appliance or pipe is another clear physical sign.

Health symptoms

Exposure to natural gas can cause a range of health symptoms, including headaches, dizziness, fatigue, nausea, and eye or throat irritation. In severe cases, it can lead to disorientation, memory problems, and even loss of consciousness. If you or anyone in your household experiences these symptoms without a clear cause, and especially if they improve when you leave the property, a gas leak could be the culprit.

Signs outside your property

Gas leaks can also manifest outside your home. Look for discoloured or dead vegetation in your garden, particularly near gas pipelines. You might also see gas escaping from the ground, causing dirt or dust to blow into the air.

Immediate actions if you suspect a gas leak

If you suspect a gas leak, immediate and correct action is paramount to ensure safety.

Prioritise ventilation and safety

As soon as you detect the smell of gas, or notice any other signs, immediately open all windows and doors to ventilate the area. If it is safe and easy to do so, turn off the gas supply at the meter.

Evacuate and call for help

Evacuate everyone from the property, including pets, and move to a safe distance outdoors. Once you are in a safe location, away from the property, call the National Gas Emergency Service on 0800 111 999. Do not re-enter the property until emergency services declare it safe.

What not to do

Never attempt to locate or fix the leak yourself. Do not use electrical switches, mobile phones, or any lighting devices such as matches or lighters indoors, as these can ignite escaped gas and cause an explosion. If there is an immediate danger to life, such as fire or an explosion, call 999 first. Otherwise, for a suspected gas leak, the specific gas emergency number (0800 111 999) is the correct primary contact.

Natural gas leak vs carbon monoxide poisoning

It is crucial to distinguish between a natural gas leak and carbon monoxide (CO) poisoning, as they have different causes, symptoms, and detection methods.

Key differences in detection and danger

Natural gas leaks are typically identified by the distinctive 'rotten egg' smell due to added mercaptan. The primary dangers are fire, explosion, and asphyxiation. Carbon monoxide, however, is a colourless, odourless, and tasteless gas produced by incomplete combustion, making it much harder to detect without a specific alarm. CO poisoning symptoms include headaches, dizziness, nausea, and confusion, which can be mistaken for flu. The main danger of CO is its ability to reduce the blood's oxygen-carrying capacity, leading to severe illness or death.

Carbon monoxide detectors

Given that carbon monoxide is undetectable by human senses, a CO alarm is the only reliable way to detect its presence. These alarms should be installed in all rooms with fixed fuel-burning appliances (excluding gas cookers) and regularly tested. In rented properties in England, Wales, and Scotland, carbon monoxide alarms are mandatory in rooms with fixed combustion appliances.

Can you detect a gas leak without smell?

While the added mercaptan makes natural gas leaks usually detectable by smell, there are situations where you might need other detection methods.

The role of gas leak detectors

Electronic gas leak detectors can sense the presence of natural gas even when the smell is faint or absent. These devices are particularly useful for individuals with a reduced sense of smell or in areas where the gas odour might dissipate quickly. They typically provide an audible alarm when gas is detected.

The 'soapy water' test: when and how

The 'soapy water' test can help pinpoint small leaks on exposed gas pipes or appliance connections, but it should only be used after you have ensured the area is safe and ventilated, and never for a major suspected leak. Mix washing-up liquid with water to create a thick, bubbly solution. Apply this solution to the suspected area with a brush or sponge. If bubbles form and grow, it indicates gas escaping. This test is suitable for checking minor connections but should not delay calling the National Gas Emergency Service (0800 111 999) if you have any significant concerns.

Preventing gas leaks and ensuring safety

Preventative measures and ongoing vigilance are key to maintaining gas safety in your home.

Regular appliance servicing

Ensure all gas appliances, including boilers, cookers, and fires, are serviced annually by a Gas Safe registered engineer. Regular servicing helps identify and rectify potential issues before they develop into dangerous leaks.

Gas safe Register engineers

In the UK, it is a legal requirement for anyone working on gas appliances and fittings to be on the Gas Safe Register. Always check an engineer's Gas Safe ID card, which includes their unique 7-digit licence number, before allowing them to carry out any work. You can verify their registration on the Gas Safe Register website.

What to do if you smell gas on the street

If you smell gas on the street or in a public area, do not try to locate the source yourself. Immediately call the National Gas Emergency Service on 0800 111 999. Provide them with the exact location and any details you can.

Fuse Energy acts as a responsible energy supplier by offering clear, authoritative guidance on urgent safety matters. Empowering customers with critical, actionable safety knowledge gives them control and confidence in an emergency situation. Fuse Energy is an energy supplier and does not provide emergency gas leak response services; these are handled by the National Gas Emergency Service.

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