Welcome to DWI

The Drinking Water Inspectorate (DWI) was formed in 1990 to provide independent reassurance that water supplies in England and Wales are safe and drinking water quality is acceptable to consumers.


What's new?

3 September 2018

Publication of revised guidance on implementing the Water Supply (Water Quality) Regulations in England and Wales

21 August 2018

Publication of Information Letter 2/2018 "Monitoring Variations under Regulation 9 and Reporting Requirements under Regulation 28"

14 August 2018

Revised ERI and CRI definitions to improve their clarity are available on the Price review process webpage.

10 August 2018

Southern Water fined for drinking water offence (PDF 84KB).

9 August 2018

Building resilient water supplies (PDF 162KB) – a joint letter from Defra, the Environment Agency, the Drinking Water Inspectorate and Ofwat to water companies in England.

9 August 2018

The Chief Inspector's Report for 2017 for Private water supplies, presented as seperate reports for England (PDF 2.17MB) and Wales (PDF 2.14MB) is published on our website.

11 July 2018

The Chief Inspector's Report for 2017 for public water supplies is published on our website.

4 July 2018

Information Letter 01/2018 (PDF 87KB) on Drinking Water Quality Legislation 2017 and 2018


Page last modified: 24 September 2018.
Page reviewed: 24 September 2018

Drinking Water Inspectorate