PARLIAMENTARY WRITTEN QUESTION
(15 July 2025)

To ask the Secretary of State for Environment, Food and Rural Affairs, whether his Department has made an assessment of the public health risks associated with PFAS contamination in drinking water; and if he will publish a list of affected catchment areas in England and Wales.

Asked by:
Helen Maguire (Liberal Democrat)

Since August 2024, the Drinking Water Inspectorate (DWI) guidance has set a guideline limit of 100 nanograms for the sum of 48 named PFAS. The limit was agreed with the UK Health Security Agency to be a robust level with an appropriate margin to ensure our drinking water is not a danger to human health. There is no evidence of PFAS above 100 nanograms in drinking water supplies. The DWI continues to monitor publications and advice provided by the World Health Organization and the UK’s Committee on Toxicity in relation to PFAS and will continue to act accordingly based on the scientific evidence as it emerges.

Answered by:
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