PFAS CRMs for Drinking Water Inspectorate (DWI) Guidelines

Drinking Water Inspectorate (DWI) Guidance for PFAS

In March 2025, the DWI published updated guidance for PFAS in drinking water requiring water companies in England and Wales to monitor for a wider range of PFAS and update their risk assessments accordingly.

The DWI guidance follows a tiered approach with a guideline value of 0.1 micrograms per litre for the sum of 48 named PFAS, which is equivalent to 0.1 parts per billion.

For more information see Drinking Water 2024 – Summary of the Chief Inspector’s report for drinking water in Wales which includes the full list of PFAS chemicals of interest as well as DWI's March 2025 PFAS Guidance to water companies.

Reference Standards for Drinking Water Inspectorate (DWI) Guidance

AccuStandard has developed Certified Reference Materials (CRMs) to test for all 48 compounds that the DWI has listed to monitor.

Need Assistance with Need Assistance with PFAS Standards?

You can shop AccuStandard's full selection of PFAS Standards.

If you still don’t see what you are looking for, reach out to techservice@accustandard.com and we can make a recommendation or create a custom product for you.