Top Signs of Gas Leaks and What to Do First

A gas leak can begin with something as ordinary as a faint smell near the cooktop or hot water system. Knowing the top signs of gas leaks helps you act early, before a small fault becomes a serious safety risk for your household, tenants, staff or property.

Gas is a safe and efficient fuel when appliances, pipework and connections are installed and maintained properly. But a suspected leak is never something to monitor for a few days or attempt to repair yourself. In Busselton and across the South West, a licenced gas fitter should inspect the issue and make the system safe.

The top signs of gas leaks to watch for

A sulphur or rotten-egg smell

Natural gas and LPG are given a strong odour so people can detect a leak. It is commonly described as smelling like rotten eggs, sulphur or rotten cabbage. If you notice this smell indoors, around an outdoor gas bottle, at the gas meter, or near a gas appliance, treat it seriously.

The smell may be obvious, but not always. A small leak can be intermittent or more noticeable when an appliance is operating. It can also become stronger in enclosed areas such as a kitchen cupboard, laundry, plant room, caravan annex or underfloor space.

Do not assume the smell is from a drain, rubbish bin or something outside without checking safely. If it is a gas odour, the priority is to get away from the area and arrange professional help.

A hissing or whistling sound near gas pipework

A larger leak may create a hissing, whistling or rushing sound. You might hear it near an appliance connection, gas meter, LPG cylinder, regulator or exposed section of pipework.

Never lean in close to find where the sound is coming from. Avoid touching fittings, tightening connections or using a flame to test for a leak. A licenced gas fitter can locate the source with the correct equipment and carry out repairs that meet Australian requirements.

Pilot lights that repeatedly go out

Older gas appliances may have a pilot light. If it will not stay lit, goes out regularly or has changed from a stable blue flame to a yellow or orange flame, it needs attention. The cause may be a dirty burner, poor ventilation, a faulty component or a gas supply issue. It is not always a leak, but it should not be ignored.

Modern appliances can show faults differently, such as failing to ignite, shutting down unexpectedly or displaying an error code. These problems can also be caused by electrical or water-related faults, so a proper inspection matters rather than guesswork.

Dead or dying plants near an external gas line

Gas escaping underground can affect plant growth by displacing oxygen in the soil. A patch of lawn that turns brown without an obvious reason, or plants dying along a gas line route, may be worth investigating.

This sign alone does not prove there is a gas leak. Poor drainage, pests, heat stress and reticulation faults are all common causes of dying plants in the South West. However, when it appears alongside a gas smell, bubbling ground after rain, or an unexplained sound near the meter, call a professional promptly.

Higher gas use without a clear reason

An unexpectedly high gas bill can point to a leak, particularly if your household habits have not changed and appliances appear to be working normally. It may also indicate an inefficient hot water system, a faulty appliance, seasonal usage or estimated meter readings.

If your meter continues moving when all gas appliances are switched off, do not rely on that observation as a final diagnosis. It is useful information to pass on, but a licenced gas fitter needs to test the system safely and identify the cause.

Physical symptoms when using a gas appliance

Headaches, dizziness, nausea, tiredness or feeling unwell in a particular room can be associated with poor combustion or inadequate ventilation. These symptoms are not a reliable way to identify a gas leak because they can have many causes, but they should never be brushed off when they occur near a gas heater, cooktop, oven or hot water unit.

There is an important distinction here. Carbon monoxide is odourless and cannot be detected by smell. It can be produced when a gas appliance is not burning correctly or is poorly ventilated. If anyone feels unwell and you suspect a gas appliance may be involved, move into fresh air and seek urgent medical advice. Do not return to use the appliance until it has been checked.

What to do if you suspect a gas leak

The right response depends on the location and severity of the suspected leak. If there is a strong gas smell, a hissing sound, a fire, an explosion, or someone is unwell, leave the building or area immediately. Call 000 from a safe location if there is immediate danger.

For any suspected leak, take these precautions:

• Do not light matches, smoke, use a lighter or create any flame.

• Do not operate electrical switches, appliances, power points, doorbells or garage remotes near the suspected leak.

• Do not start a vehicle, generator or other engine close to the area.

• If it is safe to do so without entering a gas-filled space, turn off the gas supply at the meter or LPG cylinder.

• Keep people and pets away, then contact your gas network emergency service and a licenced gas fitter from a safe location.

Opening doors and windows can help ventilate a building if you can do it quickly and safely. Do not delay leaving an area with a strong smell in order to open every window, find the source or collect belongings.

For LPG systems, be especially cautious around low-lying, enclosed spaces. LPG is heavier than air and can settle in pits, drains, basements and other low areas. Natural gas generally rises, but it can still build up in roof spaces, cupboards and poorly ventilated rooms.

Common places leaks develop

Gas leaks can occur at appliance connections, flexible hoses, valves, regulators, gas meters, corroded pipework and underground lines. Wear and tear, accidental damage during renovations, poor previous work and ageing components can all contribute.

On rural properties, long gas runs to outbuildings, outdoor kitchens, staff accommodation or sheds may need extra attention. Machinery, earthworks and changing ground conditions can affect underground services. Before digging or installing fencing, landscaping, drainage or a new structure, make sure the location of gas services is understood.

Rental properties and commercial premises have their own risks. Tenants may notice an unusual smell but not know where the isolation valve is. Busy kitchens, holiday accommodation, workshops and accommodation facilities can also put more demand on gas equipment. Clear reporting procedures and regular servicing reduce the chance that a warning sign is missed.

Why DIY gas repairs are not worth the risk

It can be tempting to replace a hose, tighten a fitting or use soapy water to investigate a suspected leak. Gas work is regulated for good reason. An incorrect repair can create a larger leak, damage an appliance, compromise ventilation or leave a dangerous fault hidden behind a wall, under a floor or in a ceiling space.

A licenced gas fitter has the training and test equipment to assess gas pressure, appliance operation, pipework integrity and ventilation. They can isolate the fault, complete compliant repairs and advise whether an appliance needs servicing, replacement or further investigation.

If you have recently had a renovation, new appliance installation or hot water system replacement and notice a gas smell afterwards, contact the installer or a licenced gas professional straight away. Do not keep using the appliance in the hope the smell will disappear.

Keep gas appliances working safely

Regular servicing is one of the most practical ways to reduce gas-related problems. Gas hot water systems, heaters, cooktops, ovens and outdoor appliances all benefit from being checked when they show changes in performance. Blue flames, reliable ignition and normal operating sounds are good signs, but they do not replace professional maintenance where it is due.

Make sure adults in the property know where the gas isolation point is and how to turn it off if it is safe to do so. Property managers and business owners should also ensure gas concerns are reported promptly, not left for the next routine maintenance visit.

If something smells wrong, sounds unusual or causes concern, trust that instinct. SmartFlow Plumbing & Gas can help South West property owners assess suspected gas faults with the practical, licenced service the job requires.