- Drinking Water 2025 – Summary of the Chief Inspector’s report for drinking water in Wales
- Foreword
- Introduction
- Water supplies and testing
- Compliance with standards
- Learning from compliance failures
- Learning from events
- Consumer contacts
- Asset health
- Water safety planning and risk assessment
- Poly and perfluoroalkyl substances (PFAS)
- Audit programme
- Recommendations
- Enforcement
- Security and Emergency Measures Direction - SEMD
- Network and Information Systems - NIS
- Materials in contact with drinking water (Regulation 31)
- Research publications
- Whistleblowers
- Working with stakeholders
Drinking Water 2025 – Summary of the Chief Inspector’s report for drinking water in Wales
Published 10:37:36 BST 9 July 2026
Published by
Drinking Water Inspectorate
Ground Floor, SW
Seacole Building
2 Marsham Street
London
SW1P 4DF
Tel: 0330 041 6501
Website: www.dwi.gov.uk
© Crown Copyright 2026
Copyright in the typographical arrangement and design rests with the Crown.
This publication (excluding the logo) may be reproduced free of charge in any format or medium provided that it is reproduced accurately and not used in a misleading context. The material must be acknowledged as Crown copyright with the title and source of the publication specified.
Dedication
The Chief Inspector’s Report 2025 is dedicated to the memory of Maria Grace, who spent 40 years in the Civil Service, including the last 14 with the Inspectorate. Maria sadly passed away in February 2026 following a short illness. She was a highly valued colleague whose commitment to public service and consumers, together with her sense of humour, was greatly valued and will be sorely missed.
Glossary
Company code with its associated company name
- AWI | Advanced Water Infrastructure Networks
- AFW | Affinity Water
- ALE | Albion Eco Ltd
- ALB | Albion Water Ltd
- ANH | Anglian Water Services Ltd
- BRL | Bristol Water Plc
- CAM | Cambridge Water Company Plc
- DWR | Dŵr Cymru Welsh Water
- ESP | ESP Water Limited
- HDC | Hafren Dyfrdwy
- ICW | Last Mile Water Ltd
- IWN | Independent Water Networks
- ISC | Isles of Scilly
- LNW | Leep Networks Water
- MTX | Matrix Water
- MUA | MUA Water Ltd
- NES | Northumbrian, Essex and Suffolk Water
- PRT | Portsmouth Water Plc
- SES | SES Water
- SVT | Severn Trent Water Ltd
- SEW | South East Water Plc
- SST | South Staffordshire Water Plc
- SWB | South West and Bournemouth Water
- SRN | Southern Water Services Ltd
- TMS | Thames Water Utilities Ltd
- UUT | United Utilities Water Plc
- VWP | Veolia Water Projects
- WSX | Wessex Water Services Ltd
- YKS | Yorkshire Water Services Ltd