Natural gas is odourless in its natural form — but Australian gas suppliers add a chemical called mercaptan to give it that distinctive rotten egg smell. Even so, many gas leaks in Melbourne go undetected until they become dangerous. Here’s what to look for.
The Smell Test: Rotten Eggs or Sulphur
The most obvious sign of a gas leak is the smell — often described as rotten eggs, sulphur, or a distinctive “gassy” odour. If you notice this near your stove, hot water system, heater, or gas meter, take it seriously. Even a faint smell warrants investigation by a licensed gas fitter.
Physical Symptoms Near Gas Appliances
Low-level gas exposure can cause:
- Unexplained headaches, particularly in rooms with gas appliances
- Dizziness or nausea that improves when you go outside
- Eye or throat irritation
- Fatigue or difficulty concentrating
If multiple people in the household experience these symptoms, and they improve when you leave the house, call a gas fitter immediately.
Sounds: Hissing or Whistling Near Gas Lines
A hissing or whistling sound near gas appliances, the gas meter, or buried gas lines in the garden can indicate gas escaping under pressure. This is a serious sign that requires urgent attention — call 0468 013 012.
Dead or Discoloured Plants Near Underground Gas Lines
Underground gas leaks can kill or discolour grass and plants in a specific area above the pipe. If you notice a dead patch in an otherwise healthy lawn — particularly in a line from the street to your home — it could indicate a leaking underground gas service line.
Pilot Lights That Keep Going Out
A pilot light that extinguishes repeatedly can indicate a faulty thermocouple — but it can also indicate an issue with gas supply or pressure. If relighting doesn’t solve the problem, have a gas fitter inspect the appliance.
Unexplained Increase in Gas Bills
If your gas bills spike without a corresponding increase in usage, gas may be escaping somewhere in your system. Compare your usage figures (shown on your bill in MJ or GJ) across similar periods — a jump with no explanation is worth investigating.
What to Do If You Suspect a Gas Leak
- Don’t turn any switches on or off — electrical sparks can ignite gas
- Don’t use your phone indoors
- Open windows and doors to ventilate
- Evacuate the building
- Call 000 for emergencies, or our 24/7 line from outside: 0468 013 012
Sedcon Plumbing’s licensed gas fitters serve Melbourne 7 days a week. For suspected gas leaks or gas appliance inspections, visit our gas leak Melbourne page.
Learn more about our Gas Leak Melbourne service, or see all suburbs we cover across greater Melbourne.