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For the second half of 2025, we have been sharing all our Legionella expertise with you, covering everything from weekly flushing and the thermostatic mixing valve, to shower heads and monthly temperature testing.
Ensuring safe, clean water is a must in any industry or organisation and we hope that this series has given some important insights into why regular water checks are so important.
Not only do preventative measures avoid growth of legionella bacteria, which can cause a severe lung infection known as Legionnaires’ disease, it can also make your water systems last longer and allow you to spot any potential problems before they become a crisis.
This final fifth instalment in the series covers annual cold water storage tank inspections.
So, what is there to know?
What does a cold water storage tank inspection consist of?
A cold water storage tank inspection should be performed at least once a year to check water quality and the condition of the tank. The checks not only identify any potential issues but also ensure the structural integrity of the tank.
As part of the inspection, a qualified professional will check:
- The water quality, including contamination, stagnant water and legionella
- Water temperature – this should be under 20 degrees centigrade to avoid growth of legionella bacteria
- Tank condition, checking both the inside and outside of the tank for rust or corrosion
- Insulation, to ensure the temperature of the water isn’t affected by extreme weather
In a home dwelling you would predominantly find a cold water storage tank in the loft, so if the main water supply fails, you have a back up option.
When should you have your water tank cleaned?
If you are struggling with inconsistent water quality, frequent system failures or a build up of sludge and scale, it is likely that your tank needs cleaning. Manual cleaning processes are doable, however, if you’re unsure of the safest or most effective process, or the job feels daunting, overwhelming or time consuming, then you can call upon expert water hygiene specialists.
What is Water Tank Cleaning?
The process of effectively cleaning a cold water tank involves a comprehensive five-step process to ensure, safe, clean water.
Firstly, the tank must be completely drained, and the structure closely inspected. Secondly, any sludge, scale or biofilm is removed from the tank using specialist equipment and techniques, to banish any harmful bacteria.
After the physical cleaning, the tank is disinfected across all surfaces to eliminate any lingering bacteria.
The disinfected is rinsed away thoroughly to ensure any new water is safe for use.
Finally, the tank is refilled with clean water, and the quality should be retested to ensure compliance.
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.
