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Thursday, 24 March 2022 07:45

Defra develop UK Verification Standard & update current guidance for ultraviolet disinfection

The Department for Environment Food and Rural Affairs has gone out to tender with a contract for a project to develop a validation standard for ultraviolet (UV) irradiation for disinfection and update existing guidance on the use of UV for water treatment.

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The Drinking Water Inspectorate published guidance on the use of UV irradiation for the disinfection of public water supplies in 2010 - the guidance was last reviewed and updated in 2016.

The guidance and validation standard is intended for use primarily by public and private water suppliers within the UK. The current guidance document provides information on the design, operation and monitoring of UV irradiation as a process for the disinfection of public water supplies intended for domestic or food production purposes.

The guidance may also be appropriate to the disinfection of waters analogous to public water supplies, such as unregulated or private water supplies.

The objectives are as follows:

  • To conduct a review of current US and European validation standards and verification techniques.
  • Search the grey and published literature for up to date evidence on the use of UV irradiation for the disinfection of public and private water supplies, including an evaluation of good operational practice.
  • Develop a prospective UK validation standard that can be used when installing small or large UV disinfection systems (public and private water supplies).
  • Amend the current DWI guidance, to maintain up to date technical relevance and ensure that the guidance is consistent and fit for purpose.


Provision must be made for liaison with the UK water industry, Water Quality Regulators, Local Health Authorities and UV disinfection supply chain to understand current developments and practice, and the impact a new validation standard may have on product installations.

The UK does not currently hold a UV validation standard. The contract will include the delivery of a UV validation standard for UV disinfection units applied in the UK in addition to a revised guidance document.

The project is expected to take approximately 7 months to complete - anticipated contract start date is 17th May 2022.

Deadline to submit tenders is `9th April 2022 – click here to access the tender documentation.

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