Poly and Perfluorinated Alkyl Substances (PFAS)

The Inspectorate provides general guidance on PFAS.

An information letter has also been issued to water companies detailing the Inspectorate’s requirements with respect to PFAS sampling and risk assessments of public water supply systems.

Research and data gathering on PFAS in water sources and drinking water supplies is ongoing. As we learn more our guidance will become more informed.

The WHO has also released guidance covering key principles with respect to PFOS and PFOA in drinking water.

Private water supply risk assessment

Due to the wide range of PFAS sources entering the environment, and the persistence of the substances, it is recommended that the potential for the presence of PFAS is included when conducting risk assessments of private water supply systems. This should inform the monitoring plan.

Risk based monitoring advice on PFAS in private water supplies can also be found on our website.


Laboratory capability and capacity is expanding, with analytical methods being developed to enable detections of a larger range of PFAS, at ever finer concentrations.

The United Kingdom Accreditation Service (UKAS) is the organisation responsible for accrediting the analytical capabilities of laboratories.

The UKAS website lists laboratories currently accredited for PFAS analysis.

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