Drinking Water Inspectorate

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Drinking Water Inspectorate is part of the Occupational Health & Safety Information Service's online subscription. Bringing you a comprehensive selection of legislation, regulations, guidance, standards, including BSI and best practice which is updated daily, you can find documents on a wide range of subject areas such as Food & Drink, Environmental Health, Environmental Management, Fire & Offshore Safety.

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Documents supplied by Drinking Water Inspectorate

A Case Control Study Investigating Drinking Water and Dairy Products in the Aetiology of Crohn's Disease - A Possible Role for Mycobacterium Avium Paratuberculosis - The CMAW (Crohn's Mycobacteria And Water) Study - Final Report

Amendments to Standard Operating Protocols for the Monitoring of Cryptosporidium Oocysts and Notification of Recent Approvals of Equipment and Reagents

Chief Inspector's Report 2002

Chlorinated Tap Water and the Unborn Child

Cryptosporidiosis - A Report on the Surveillance and Epidemiology of Cryptosporidium Infection in England and Wales

Cryptosporidiosis in North Wales - Advice Letter

DWI Advice Letter - Cryptosporidiosis

DWI Guidance on the Notification of Events

DWI Information Letter 01/05: Requirements for Monitoring Radioactivity in Water Supplies

DWI Information Letter 01/2008: The Water Supply (Water Quality) Regulations 2000 as Amended - Publication of an Unofficial Consolidated Version of the Regulations

DWI Information Letter 02/05: Issues Relating to the Submission of Sample Data to the Drinking Water Inspectorate

DWI Information Letter 02/06: Concessionary Supplies - Reporting of Compliance Results and the Calculation of Operational Performance Indices

DWI Information Letter 02/2007: Changes to the Approval Arrangements for Products Under Regulation 31

DWI Information Letter 02/2008: The 2009 Periodic Review of Prices - Guidance on Drinking Water Quality Requirements

DWI Information Letter 03/06: Issues Relating to 2006 Monthly Data Submissions to the Drinking Water Inspectorate, and Information Required for Inclusion in the Chief Inspector's Report

DWI Information Letter 03/2007: New Structure for the Drinking Water Inspectorate

DWI Information Letter 03/2008: Guidance on the Notification of Events

DWI Information Letter 04/05: New Structure of the Drinking Water Inspectorate

DWI Information Letter 04/2007: New Structure for the Drinking Water Inspectorate

DWI Information Letter 04/2008: Regulation 31

DWI Information Letter 05/04: Commencement of Part 3 Provisions of Water Act 2003

DWI Information Letter 05/05: Code of Practice on Technical Aspects of Fluoridation of Water Supplies 2005 - Includes Code of Practice

DWI Information Letter 05/06: Control of Water Treatment Chemicals

DWI Information Letter 05/2007: Guidance on the Water Supply (Water Quality) Regulations 2000/2001 Specific to PFOS (Perfluorooctane Sulphonate) and PFOA (Perfluorooctanoic Acid) Concentrations in Drinking Water

DWI Information Letter 05/2008: Audit of Regulation 35(1)

DWI Information Letter 05/2008: Concessionary Supplies - Further Guidance

DWI Information Letter 06/04: Microbiological Quality of Water Leaving Treatment Works and in Service Reservoirs - Drinking Water Safety Plans and Regulation

DWI Information Letter 06/05: Update on the Restructuring of the Drinking Water Inspectorate

DWI Information Letter 06/06: DWI Drinking Water Quality Improvement Programmes - Process for Agreeing Changes to Improvement Programmes Associated with Legal Instruments

DWI Information Letter 06/2007: Outcome of the Consultation Exercise on Amendment to the Water Supply (Water Quality) Regulations 2000 - Requirements for Raw Water Monitoring

DWI Information Letter 07/05: Contact Arrangements for the Notification of Events Under the Water Undertakers (Information) Direction 2004 and Notification of Cryptosporidium Anomalies

DWI Information Letter 07/06: Further Update on the Restructuring of the Drinking Water Inspectorate

DWI Information Letter 07/2007: Outcome of the Consultation Exercise on Amendment to the Water Supply (Water Quality) Regulations 2000 - Publication of the Amendment Regulations and the Government Response to the Consultation

DWI Information Letter 08/04: Technical Audit of Water Companies Under Section 86 of the Water Industry Act 1991 - Summary of the Vertical Audits for Microbiological Parameters, 2003

DWI Information Letter 08/05: Technical Audit of Water Companies Under Section 86 of the Water Industry Act 1991 - Summary Report for the Vertical Audits for Non Microbiological Parameters, 2004

DWI Information Letter 08/06: Contact Arrangements for the Notification of Events under the Water Undertakers (Information) Direction 2004 and Notification of Cryptosporidium Anomalies

DWI Information Letter 08/2007: Guidance on Interpretation of Regulation 16(2)(d)(i) of the Water Supply (Water Quality) Regulations 2000 (2001 in Wales)

DWI Information Letter 09/04: Drinking Water Quality - Comparative Measures

DWI Information Letter 09/05: Regulation 31 of the Water Supply (Water Quality) Regulations 2000 and 2001 - Approval and Use of Packing Materials in Water Treatment Processes

DWI Information Letter 09/06: Update on the In-situ Resin Lining of Water Mains Under Regulation 31(10)(b) of the Water Supply (Water Quality) Regulations 2000 (2001 Wales)

DWI Information Letter 09/2007: The Water Supply (Water Quality) Regulations 2000 (Amendment) Regulations 2007 - Changes to Water Company Data Tables

DWI Information Letter 1/02: Feedback from Water Companies on DWI Performance during the Period July 2000 - June 2001

DWI Information Letter 1/06: Annual Provision of Information on Consumer Contacts

DWI Information Letter 1/93: Water Supply (Water Quality) Regulations 1989: Approval Of Substances And Products - Conditions Of Approval For In-Situ Applied Epoxy Resin Products

DWI Information Letter 1/94: Sampling From Service Reservoirs

DWI Information Letter 10/04: Monitoring Drinking Water at Establishments Where Water Is Supplied to the Public

DWI Information Letter 10/05: Update on the Restructuring of the Drinking Water Inspectorate

DWI Information Letter 10/06: Cryptosporidiosis in England and Wales

DWI Information Letter 10/2007: Updated Guidance on the Notification of Events

DWI Information Letter 10/96: 2nd Edition of "In Situ Epoxy Resin Lining - Operational Guidelines and Code of Practice" (OGCP)

DWI Information Letter 10/97: Cryptosporidium in Water Supplies

DWI Information Letter 11/04: Information Requirements Following Notification of an Exceedence of a Regulatory Standard

DWI Information Letter 11/05: Guidance to Inset Appointees on their Regulatory Responsibilities

DWI Information Letter 11/94: Report 71 - "The Microbiology Of Water 1994 - Part 1 - Drinking Water."

DWI Information Letter 12/04: Information Requirements Following Notification of an Exceedence of a Regulatory Standard

DWI Information Letter 12/05: Guidance on Sample and Sample Extract Stability Trials and the Preservation and Preparation of Samples for Metals Analysis

DWI Information Letter 12/94: Approval of Substances, Products and Processes

DWI Information Letter 13/04: Common Carraige - Guidance on the Drinking Water Quality Aspects

DWI Information Letter 13/05: Further Update on the Restructuring of the Drinking Water Inspectorate

DWI Information Letter 14/04: Cryptosporidium in Water Supplies - Anomaly Reporting for the Water Supply (Water Quality) Regulations 2000 (England) and Water Supply (Water Quality) Regulations 2001(Wales)

DWI Information Letter 15/03: Water Supply (Water Quality) Regulations 2000 - Improvement Programme Documentation - Update for 2004 Zone Delineations

DWI Information Letter 15/05: Distribution Operation and Maintenance Strategies (DOMS) - Update to DWI Requirements and Expectations

DWI Information Letter 16/03: The Water Supply (Water Quality) Regulations 2000 and the Water Supply (Water Quality) Regulations 2001 - Monitoring for Clostridium Perfringens

DWI Information Letter 16/05: The Cryptosporidium Web Site and the Latest Revision of Part 1 of the Standard Operating Protocol

DWI Information Letter 17/05: Cryptosporidiosis in England and Wales

DWI Information Letter 2/02: Provision of Compliance Data and Preparation of Summary Tables for the Chief Inspector's Annual Report

DWI Information Letter 2/91: Provision Of Information To The Inspectorate

DWI Information Letter 2/94: Guidance on Implementation of Paragraph 5(1) of the Water Undertakers (Information) Direction 1992

DWI Information Letter 2/95: Drinking Water Quality Improvement Programme: Periodic Review Of Price Limits 1995-2005

DWI Information Letter 2/97: Digest Of Environmental Protection And Water Statistics Fluoride Concentrations In Water Supplies

DWI Information Letter 3/02: Cryptosporidium in Water Supplies: Guidance on Low-Pressure Membrane Integrity Monitoring

DWI Information Letter 3/03: Water Supply (Water Quality) Regulations 2000 - Authorised Departures Under Regulations 42 and 20

DWI Information Letter 3/94: Guidance On Information To Be Provided In Initial And Final Reports On Water Quality Events And Other Matters (Reference Dwi Information Letter 2/94)

DWI Information Letter 3/95: Contravention of Microbiological Standards as a Result of The Condition of Consumer S Plumbing at the Time of Sampling From Consumers Taps

DWI Information Letter 3/96: Regulation 25 - Water Supply (Water Quality) Regulations 1989 - Variation To Conditions Of Use For Granular Activated Carbon

DWI Information Letter 4/02: Prevention of Contamination of Public Water Supplies by Backflow from Water Company Sites and other High Risk Premises

DWI Information Letter 4/03: The 2004 Periodic Review of Prices and AMP4 - Further Guidance

DWI Information Letter 4/91: Inspectorate Organisation

DWI Information Letter 4/92: Water Byelaws

DWI Information Letter 4/93: Statistical Aspects Of Water Quality Information Requirements

DWI Information Letter 4/94: Water Supply (Water Quality) Regulations 1989

DWI Information Letter 5/02: Drinking Water Quality - Comparative Measures

DWI Information Letter 5/03: The 2004 Periodic Review of Prices and AMP4 - Appraisal Methodology for Water Company Proposals for Drinking Water Quality Improvement Schemes

DWI Information Letter 5/93: Lessons for Water Supply from an Outbreak of Cryptosporidiosis in the North Humberside Area

DWI Information Letter 5/96: Inclusion of Total Hardness and Alkalinity Data in Annual Summary Compliance Statistics - Chief Inspector S Reports and Regulation 31 Reports

DWI Information Letter 5/97: 1996 Data Returns For Distribution System Undertakings

DWI Information Letter 6/03 (Revised): The Water Undertakers (Information) Direction 2003 - Format for Provision of Certain Information

DWI Information Letter 6/03: The Water Undertakers (Information) Direction 2003 - Format for Provision of Certain Information

DWI Information Letter 6/96: European Standards For Water Treatment Chemicals - Status With Respect To Regulation 25 Of The Water Supply (Water Quality) Regulations 1989

DWI Information Letter 7/92: Review Of Technical Audit Procedures

DWI Information Letter 7/94: Use Of Colilert For Compliance Analysis

DWI Information Letter 7/95: Drought Orders - Drinking Water Quality Considerations

DWI Information Letter 7/96: Application and Introduction of Substances and Products - Notice Given Under Regulation 25(5) of The Water Supply (Water Quality) Regulations 1989

DWI Information Letter 7/97: Disinfection After Mains Bursts and Repairs and Other Mains Activities

DWI Information Letter 8/02: Feedback on DWI from Water Companies together with DWI Responses

DWI Information Letter 8/92: Digest Of Environmental Protection And Water Statistics Fluoride Concentrations In Water Supplies

DWI Information Letter 8/94: Treatment Of Values Less Than The Limit Of Detection When Calculating Means

DWI Information Letter 8/95: Technical Audit of Water Companies Under Section 86 of The Water Industry Act 1991: Review Of Incidents and Inspection of Treatment Works and Service Reservoirs 1995

DWI Information Letter 9/94: Digest of Environmental Protection and Water Statistics Fluoride Concentrations in Water Supplies

DWI Information Letter 9/97: Prohibition of Use of Substances or Products Which Water Companies Are Authorised to Introduce in Contact With Water Supplies Under the Provisions of Regulation 25(1)(C) Of The Water Supply (Water Quality) Regulations 1989

Discoloured Water

Drinking Water 1990 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 1992 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 1994 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 1995 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 1996 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 1997 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 1998 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 1999 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 2000 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 2001 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 2002 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water 2003 - A Report by the Chief Inspector Drinking Water Inspectorate (DWI)

Drinking Water 2005 - A Report by the Chief Inspector, Drinking Water Inspectorate

Drinking Water 2006 - Drinking Water in England and Wales - A Report by the Chief Inspector of Drinking Water

Drinking Water 2007 - Drinking Water in England and Wales - A Report by the Chief Inspector of Drinking Water

Drinking Water for Wales 2000 - A Report by the Chief Inspector, Drinking Water Inspectorate

Drinking Water for Wales 2002 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water for Wales Annual Report 1999 - A Report by the Chief Inspector, Drinking Water Inspectorate

Drinking Water for Wales Annual Report 2001 - A Report by the Chief Inspector Drinking Water Inspectorate

Drinking Water for Wales Annual Report 2003 - A Report by the Chief Inspector, Drinking Water Inspectorate (DWI)

Drinking Water in England 2004 - A Report by the Chief Inspector, Drinking Water Inspectorate

Drinking Water in Wales 2004 - A Report by the Chief Inspector Drinking Water Inspectorate

Feedback from the Water Companies on the Performance of the Drinking Water Inspectorate in 2000/2001 - Report of a Survey undertaken for DWI

General Principles of Sampling Waters and Associated Materials (second edition) 1996 Estimation of Flow and Load 1996

Guidance Note on the Approval of Substances and Products Used in the Provision of Public Water Supplies - 1995 Revision - Committee on Chemicals and Materials of Construction for Use in Public Water Supply and Swimming Pools

Guidance on Assessing Risk from Cryptosporidium Oocysts in Treated Water Supplies to Satisfy the Water Supply (Water Quality)(Amendment) Regulations 1999 SI 1524

Guidance on the Water Supply (Water Quality) Regulations 2000 (England) and the Water Supply (Water Quality) Regulations 2001 (Wales)

Guidance on the Water Supply (Water Quality) Regulations 2000/01 Specific to PFOS (Perfluorooctane Sulphonate) and PFOA (Perfluorooctanoic Acid) Concentrations in Drinking Water

Guidelines for Laboratory Calibration (These Guidelines Have Been Produced as a Statement of the Recommended Minimum Requirements for Satisfactory Calibration in Laboratories Carrying out Analysis for the Purpose of Parts IV, V and VI of the Water Supply (Water Quality) Regulations 1989 as Amended (the 1989 Regulations).)

How Good Is Your Drinking Water? - Summary Of The 1994 Report By The Drinking Water Inspectorate

How Good Is Your Drinking Water? - Summary Of The 1996 Report By The Drinking Water Inspectorate

How Good is the Drinking Water? - A Summary of the Results Arising from the Monitoring of Drinking Water Supplies During 1998

Interim Guidance on the Water Supply (Water Quality) Regulations 2000 (England) and the Water Supply (Water Quality) Regulations 2001 (Wales)

Lead in Drinking Water - Have You Got Lead Pipes?

List of Approved Products - February 2008

List of Approved Products and Processes - December 2002

List of Approved Products and Processes - December 2005

List of Substances, Products and Processes Approved Under Regulations 25 and 26 for Use in Connection with the Supply of Water for Drinking, Washing, Cooking and Food Production Purposes

Manual on Treatment of Private Water Supplies

Operational Requirements - In Situ Resin Lining of Water Mains

Periodic Review of Water Price Limits 2004

Press Release - DWR Cymru Welsh Water Pleads Guilty to Supplying Water Unfit for Human Consumption

Press Release - Three Valleys Water Pleads Guilty to Charge of Supplying Water Unfit for Human Consumption

Regulation 25 Letter 04/2003: Regulation 31 of the Water Supply (Water Quality) Regulations 2000 and 2001: Supply of Water, other than Through Pipes, During Emergencies and Routine Maintenance

Regulation 25 Letter 05/2003: Reminder to Water Companies About the Prohibition in the Use of Lead-Based Compounds in PVC-U Water Supply Pipes That Comes into Force on 25 December 2003

Regulation 25 Letter 06/2003: Committee on Products and Processes for Use in Public Water Supply - New National Condition of Use for Hydrogen Peroxide

Regulation 31 Letter 03/2005: Notice of Intention to Modify Conditions of Approval - Regulation 31 (10)(b) of the Water Supply (Water Quality) Regulations 2000 (2001 Wales)

Review of Evidence for Relationship Between Incidence of Cardiovascular Disease and Water Hardness - Final Report for Contract DWI/70/2/176

Standard Operating Protocol for the Monitoring of Cryptosporidium Oocysts in Treated Water Supplies to Satisfy The Water Supply (Water Quality) Regulations 2000, SI No 3184 England, The Water Supply (Water Quality) Regulations 2001, SI No 3911 (W.323) Wales

Standard Operating Protocol for the Monitoring of Cryptosporidium Oocysts in Treated Water Supplies to Satisfy the Water Supply (Water Quality) Regulations - 2000, SI No. 3184 England and 2001, SI No. 3911 (W.323) Wales

The Drinking Water Inspectorate Guidance on the Notification of Events

Water Contamination Emergencies - Can We Cope? - Application Form for Conference held 16-19 March 2003

Water Supply (Water Quality) Regulations 2000/2001 - Report on the Results of the Survey of Analytical Performance for the Measurement of Lead

Your Drinking Water - Who Looks After It? - The Role of the Drinking Water Inspectorate in England and Wales

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