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Mains Pipework Chlorination

A mains injection or pipe work chlorination is the process of disinfecting and pre-commissioning new private water supplies connecting to the mains, extending to a building's internal hot and cold domestic system.

The recognised standard for undertaking this work is BS 8558 alongside any additional requirements of certain water authorities.

If these standards are not met, the local water board have the right to refuse the final connection of the water system to the mains water supply. This is to prevent any possible contamination from the water system feeding back and contaminating the mains water supply.

Heating and chilled systems also have pre-commission cleaning requirements.

When is a pipework disinfection required?

  • In any new installations as part of a building's commissioning procedure
  • Where major extensions or alterations have been carried out to the water system
  • Where underground pipe work has been installed connecting to the mains supply
  • If contamination within the water system is suspected
  • If the water system has not been in regular use and therefore the pipe work has not been flushed regularly


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.