Information about testing

How do I test for Legionella?

A. Step 1 Find information about testing facilities via the National Association of Testing Authorities Australia 

Step 2 Find information here about where to test and the frequency tests should occur.

What do you do if you get a positive result?

A.  Assess the risk.

Step 1 Refer to your Water Risk Management Plan (WRMP) if you have one.

Step 2 f you don't have a Water Risk Management Plan (WRMP) go to  step 3 and 4 and see the link here for developing a Water Risk Management Plan.

Step 3 Contact a licensed plumber that specialises in Legionella Control and Management.

Step 4  In a domestic or commercial situation, assess the risk and respond accordingly.  i.e. if there are people with compromised health conditions or elderly residents in the facility seek advice from your relevant health authority (Queensland Health). 

Who do I need to contact? 

A. Refer to Question 2

How do I treat an infected water system?

A.There is no one common solution to solve this type of issue.  Every situation should be assessed and the appropriate method for that system should be used.  The following items should be considered in conjunction with the WRMP.

Common methods of disinfecting a contaminated system are (Not in any order):  

  • Pasteurising
  • Chlorination
  • Hyper (shock) Chlorination
  • Copper Silver Ionisation (CSI)
  • Flushing
  • Various chemical treatments
  • Ultra Violet Light Disinfection
  • Ozone
  • Point of use Filtration

Each one of the methods above carry an inherent risk and should only be carried out by a suitably experienced person or contractor.


Where is the best location to test for Legionella? 

A.  Test at shower roses and basins on both hot and cold points

How Frequently should testing occur? 

A.  Refer to the water risk management plan. 

Should testing for Legionella be carried out at TMV's  

A.  Yes, test on both hot and cold sides

Should the hot water reticulation be tested for Legionella? 

A.  Routine times may vary but testing should be carried out at the furthest point in the reticulation and at the water heater plant at the hot water return point (pump).

© Copyright Legionella Tips