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<p>There are already statutory duties on water companies and local authorities to
carry out risk assessments and sample drinking water supplies for anything which would
constitute a potential danger to human health. This includes per- and polyfluoroalkyl
substances (PFAS). The Drinking Water Inspectorate has a guideline value on individual
types of PFAS of 100 nanograms per litre. It was set in 2021 based on an assessment
of existing scientific knowledge and agreed with the UK Health Security Agency (UKHSA)
to be a robust level with an appropriate margin to ensure our drinking water is safe
to drink. There is no evidence of PFAS concentrations above this value in drinking
water supplies.</p><p> </p><p>Nevertheless, work is continuing with other government
departments, regulators and the devolved administrations to assess levels of PFAS
occurring in the environment, their sources and potential risks to safeguard current
high drinking water quality and ensure our regulations remain fit for purpose.</p>
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