What is Legionella?

Legionella is a type of bacteria that most commonly causes one of two illnesses:

• Pontiac fever is a mild, flu-like illness
• Legionnaires’ disease is a type of severe pneumonia

Legionella occurs naturally in lakes and rivers, but it can grow inside household water systems if conditions are right. Stagnant water, warm temperatures (20–45°C) and biofilm build-up in pipes all encourage the bacteria to multiply. That’s why a Legionella water test is the only reliable way to know whether your home’s water is affected.

Who Needs Legionella Testing & Why?

Legionnaires’ disease can be fatal. You can’t catch it from drinking water. Infection happens when you breathe in contaminated water droplets, such as spray from a showerhead or tap. That’s why regular Legionella testing is important for:

• Homeowners & Landlords: Ensure your domestic water system is safe, especially before re-occupying a property.
• Holiday Home Owners: If your property has been empty for some time, stagnant water can promote bacterial growth.
• Hot Tub & Pool Owners: Legionella thrives in warm water environments.
• Private Well Users: Regular testing is crucial if your home is not connected to a mains water supply.
• Higher-Risk Households: Older adults, smokers and anyone with a weakened immune system or chronic health condition are more vulnerable. If someone in your home is at higher risk, testing can help prevent infection.