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Over the last couple of months, we have been sharing our expertise on Legionella here in our new, insightful blog post series. So far, it has covered weekly flushing and the thermostatic mixing valve – or the TMV as it is better known.
The series provides a snapshot of the crucial information you need to ensure that you’re checking your water regularly for any signs of legionella, in order to protect anyone using it.
Safe, clean water is vital.
This month we are looking at monthly temperature testing, because it is a key element of protecting water systems and preventing any growth of legionella bacteria, which can cause a severe lung infection known as Legionnaires’ disease.
What does monthly temperature testing consist of?
The clue is in the title for this one. To comply with the HSE published guidance’s of ACOP L8 and HSG 274 part 2, it is a legal obligation for a responsible person to check all water systems in your property every month and make a record of their findings.
During a monthly temperature check, a professional calibrated thermometer is used to test the water at the nearest and furthest points of each system – the sentinel points. By testing the areas closest and furthest away, you can get a representation of the whole water system.
For hot water, allow the tap to run for at least a minute to reach its maximum temperature before testing. The temperature is taken from the flow.
In a cold water storage tank, the reading is taken from inside the tank itself, from underneath the ball valve.
Hot water should be at least 50°C at the taps within one minute of running the water and cold water should be less than 20°C within two minutes of running the tap.
For larger systems, every month record the intermediate sentinel points and rotate those each time.
Why do you need to do monthly temperature testing?
All organisations must hold a record of monthly temperature checks for both hot and cold water systems, plus any water services such as water heaters and calorifiers. It is a statutory requirement.
The regular checks are a crucial control measure for the prevention of legionella and also help to identify any possible problems inside a water system, which can then be addressed before they cause any major issues.
If temperatures are incorrect, it is important to take immediate action to avoid any further problems and stem any bacteria growth.
Anyone involved in water system management who requires more information on water safety and legionella should sign up for the Acorn Safety Services legionella awareness course.
Alternatively talk to our team of experts by calling 01604 930380.
