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.

DWI's 30 Year Anniversary "March for Water" event


What's new?

03 February 2020

DWI updated position paper on Drinking Water Quality in England and Wales as the UK exits from the European Union (PDF 82KB)

30 January 2020

Drinking Water 2019 - Quarters 1 and 2 have been published.

01 August 2019

The Drinking Water Inspectorate Risk Management Assessment Scheme has been launched on 01 August 2019. It has been jointly developed by the Inspectorate, Lloyd’s Register and in consultation with water companies. Further details can be found in the Water Safety Plan section of the website.

29 July 2019

The Inspectorate’s Guidance to water companies on the Notification of Events has been updated. Version 1.1 replaces the previous version 1.0.

11 July 2019

The Drinking Water Inspectorate has published its annual reports for public and private water supplies in England and Wales covering 2018.  The reports cover the quality of public drinking water supplies and reports on the progress of local authorities in the regulation of private water supplies. Alongside the reports are published sample results and performance statistics for companies.

25 June 2019

Publication of Information Letter 03/2019 on The Water Industry (Suppliers’ Information) Direction 2019

10 June 2019

Thames Water Utilities Ltd fined for drinking water offences(PDF 76KB)

24 April 2019

The Inspectorate has published a Guidance on Consumer Complaints (PDF 89KB) document for water suppliers on how the Inspectorate investigates consumer complaints about drinking water quality that are escalated to DWI, and information that companies should include in their report to DWI.

24 April 2019

The Inspectorate’s Guidance to companies on the Water Supply (Water Quality) Regulations has been updated following publications of the Environment, Food and Rural Affairs (Miscellaneous Amendments etc.) Regulations 2019 – SI No. 526

24 April 2019

Publication of Information Letter 02/2019 on Reporting Requirements under Regulation 28 of the Water Supply (Water Quality) Regulations.

5 March 2019

Joint letter from UK Regulators on the Suitability of metallic materials for use in contact with drinking water (PDF 159KB)





Page last modified: 3 February 2020
Page reviewed: 3 February 2020

Drinking Water Inspectorate