Our Services

Water Storage Tank Chlorination

Water storage tanks are an essential part of any water distribution system, providing a reliable source of water for households, businesses, and communities. However, over time, these tanks can become contaminated with harmful bacteria, viruses, and other microorganisms that can pose a serious threat to public health. That's why water storage tank chlorination is a critical component of any water management program.

Water storage tank chlorination is the process of adding chlorine to a water storage tank to disinfect it and eliminate harmful microorganisms. Chlorine is a highly effective disinfectant that can kill a wide range of bacteria, viruses, and other microorganisms. When added to a water storage tank, chlorine reacts with any microorganisms present in the water, killing them and rendering the water safe for consumption.

Do I need a water storage tank clean and disinfection?

  • If a routine inspection shows it to be necessary
  • If the system or part of it has been substantially altered or entered for maintenance or remedial purposes in a manner that may lead to contamination, or
  • During or following an outbreak or suspected outbreak of Legionellosis:

The risk from exposure to Legionella should be prevented or controlled; precautions include keeping the system and the water in it clean.
ACoP L8, paragraph190

What is involved during a clean and disinfection?

Clean and disinfection services are carried out in accordance with ACoP L8 following the procedures outlined in BS6700.

  • An engineer will visit your site and initially conduct an assessment to identify any additional health and safety precautions required
  • Isolation of the cold water storage tank and any pump sets
  • Fully drain the tank and undertake a physical clean to impeccable aesthetic standards
  • Chemical cleaning using silver based hydrogen peroxide - the use of this chemical halves the volume of water needed to be 'dumped' than using conventional methods
  • Use of alternative chemicals such as chlorine and bio/oil dispersants where applicable
  • Where required, full system disinfection including all assets and pipe work, measuring chemical levels at every outlet to ensure successful disinfection
  • Tests carried out for TVC, e-coli, coliform and Legionella by a UKAS accredited laboratory
  • Issue of disinfection certificate and sample results for your log book


Useful information about Legionella and what it means for your business.

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Call our experts on 0333 355 1875 to discuss your water management needs.