When we think about water safety in our homes, most of us picture leaks, burst pipes, or discoloured water. But there’s a silent threat that many homeowners overlook: bacteria breeding inside your plumbing system.
Old pipes, unused taps, and stagnant water can turn your plumbing into the perfect environment for harmful microbes like Legionella to thrive — a serious water safety risk that often goes unnoticed until it's too late.
Here’s what every homeowner needs to know.
Legionella pneumophila is a type of bacteria found naturally in freshwater sources, but when it gets into man-made plumbing systems, it can become a health hazard. The bacteria multiply in warm, stagnant water and can spread through aerosols — tiny droplets released from taps, showers, or even garden hoses.
When inhaled, Legionella can cause Legionnaires’ disease, a type of pneumonia. People over 50, smokers, or those with weakened immune systems are most at risk.
It’s not something that should be taken lightly, especially when simple checks and professional maintenance can prevent it.
You don’t need to live in a high-rise or run a commercial building to be at risk. Ordinary household plumbing systems can provide ideal conditions for bacteria to flourish, especially when:
That guest bathroom you haven’t touched in months? Or the outdoor tap you haven’t turned on since summer? When water doesn’t flow, it stagnates. Stagnant water is a prime environment for bacterial growth.
Older homes with galvanised iron or copper pipes may have corrosion or mineral buildup inside the plumbing. This buildup provides surfaces for bacteria to cling to and multiply. Even newer homes can face risks if plumbing has been poorly installed or maintained.
Legionella thrives in temperatures between 20°C and 50°C. If your hot water system is set too low or your water heater isn’t functioning efficiently, bacteria can grow inside the tank or pipes.
‘Dead legs’ refer to sections of pipework that no longer serve a purpose but still contain water. These hidden spaces often remain unnoticed but can be ideal for bacteria to grow.
While bacterial growth can be silent, there are subtle signs that could point to issues within your plumbing system:
If you notice any of these, it’s time to speak to a qualified plumber. It’s always better to check than to assume.
Professional plumbers are trained to assess risks, identify problem areas, and restore your system to a safer state. Here’s how they typically help:
Trying to handle this yourself can not only be ineffective — it can also expose you to health risks. It’s safer and smarter to hire a licensed expert.
It’s not just older homes that should be on alert. Your property may be at higher risk of waterborne bacteria if:
If any of these apply, it’s worth having your plumbing checked.
While prevention always beats repair, some of the most effective measures involve a licensed professional. Here’s what can be done:
A plumber can also install filters or backflow prevention devices if required.
Water safety is one of those areas where you don’t want to cut corners. Whether it’s replacing old pipes or checking your hot water system, you need someone experienced and reliable.
On ServiceSeeking.com.au, you can easily find licensed plumbers in your area who are rated and reviewed by real customers. It’s fast, hassle-free, and gives you confidence that the job will be done properly.
Don’t let hidden bacteria compromise your family’s health — book a professional today.