A report by the Chief Inspector of drinking water

The Drinking Water Inspectorate annual report Drinking water 2020 provides an overview of the quality of public and private water supplies in England and Wales. It comprises of the following:

Chief Inspector’s Letter to Ministers (for England and Wales)

The letters from the Chief Inspector to the Ministers in England and in Wales contain a high level overview of findings for the year.

Letter to Minister – Wales

Public water supplies

Annual Summary Reports

The report covers England and Wales and summarises the testing and results of water quality tests, events and technical audit activity.

Quarterly reports published


Quarter 2

Quarter 2: April – June 2020

Quarter 3

Quarter 4


Presentation Slides

Presentation Recordings

Private Water Supplies

Presented as separate reports for England and Wales and publishing numbers and types of supplies, a summary of monitoring results and case studies.



Wales – Welsh Translation

Company and Performance Data

Company name

Sample results

Company statistics and company performance data

Affinity Water

Download (PDF 47KB)

Download (PDF 16KB)

Albion Water

Download (PDF 71KB)

Download (PDF 15KB)

Albion Eco

Download (PDF 57KB)

Download (PDF 16KB)

Anglian Water

Download (PDF 111KB)

Download (PDF 95KB)

Bristol Water

Download (PDF 80KB)

Download (PDF 16KB)

Cambridge Water

Download (PDF 62KB)

Download (PDF 16KB)

Dŵr Cymru Welsh Water

Download (PDF 91KB)

Download (PDF 126KB)

Hafren Dyfrdwy

Download (PDF 122KB)

Download (PDF 16KB)

Icosa Water

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Download (PDF 15KB)

Independent Water Networks

Download (PDF 56KB)

Download (PDF 95KB)

Isles of Scilly

Download (PDF 100KB)

Download (PDF 16KB)

Leep Networks Water

Download (PDF 60KB)

Download (PDF 16KB)

Northumbrian, Essex and Suffolk Water

Download (PDF 117KB)

Download (PDF 18KB)

Portsmouth Water

Download (PDF 68KB)

Download (PDF 15KB)

SES Water

Download (PDF 82KB)

Download (PDF 14KB)

Severn Trent Water

Download (PDF 121KB)

Download (PDF 16KB)

South East Water

Download (PDF 101KB)

Download (PDF 16KB)

Southern Water

Download (PDF 104KB)

Download (PDF 153KB)

South Staffordshire Water

Download (PDF 89KB)

Download (PDF 16KB)

South West and Bournemouth Water

Download (PDF 86KB)

Download (PDF 16KB)

Thames Water

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Download (PDF 171KB)

United Utilities

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Download (PDF 16KB)

Veolia Water Projects

Download (PDF 64KB)

Download (PDF 15KB)

Wessex Water

Download (PDF 51KB)

Download (PDF 16KB)

Yorkshire Water

Download (PDF 124KB)

Download (PDF 16KB)

Prosecution and Cautions

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