Information Letters and Advice Notes

The Drinking Water Inspectorate uses Information letters and Advice notes to communicate with the water industry, local authorities and other relevant parties.

Information letters are used by DWI to communicate any changes in regulatory matters and Advice notes relate to changes in guidance or procedures.

They are automatically sent to named contacts but are available on request to anyone.

The list below includes only those letters that contain current information. Many older letters have been superseded. However, copies of such letters are available by contacting dwi.enquiries@defra.gsi.gov.uk

These documents are in PDF format. The Adobe® Acrobat Reader® can be freely downloaded here

2017

REF

TITLE

Annex

03/2017 (Sept 17)

INFORMATION LETTER

Update to guidance documents including a guidance note on long term planning for drinking water quality (PDF 119KB)

 

02/2017
(May 17)

INFORMATION LETTER

Further guidance on Chromium in drinking water (PDF 122KB)

 

01/2017
(Feb 17)

INFORMATION LETTER

The Water Industry (Suppliers’ Information) Direction 2017(PDF 75KB)

Information Direction (PDF 87KB)

2016

REF

TITLE

Annex

04/2016
(Jun 16)

New drinking water quality legislation (2016) (PDF 152KB)

N/A

02/2016
(Mar 16)

Legislative changes relating to the DWI cost recovery scheme (PDF 61KB)

N/A

01/2016
(Jan 16)

Code of practice on technical aspects of fluoridation of water supplies 2016 (PDF 113KB)

Code of practice (PDF 306KB)

2015

REF

TITLE

Annex

02/2015

Legal Instruments - Processes for reporting on, agreeing changes to and closure/revocation (PDF 113KB)

1 - Undertaking progress (PDF 102KB)
2 - Distribution consumer acceptability and discolouration schemes (PDF 71KB)
3 - Notice progress (PDF 103KB)
4 - Justification of proposed changes (PDF 73KB)
5 - Undertakings completion report (PDF 55KB)
6 - Notice completion report (PDF 113KB)

01/2015

Regulation 28 reporting requirements (PDF 115KB)

A - Specification (PDF 266KB)


2014

REF

TITLE

Annex

02/2014

Regulation 28 reporting requirements (PDF 110KB)

A - General requirements
Updated in annex A of IL 01/2015
B - Specification
Updated in annex A of IL 01/2015
C - Parameter/Hazard list (XLS 138KB)
D - Example tables (Zip file 173KB)
Updated September 2014
E - Query log (XLS 125KB)
Updated 12 November 2014

01/2014

Metaldehyde and other pesticides (PDF 134KB)

N/A


2013

REF

TITLE

Annex

05/2013

Drinking water analysis and the regulatory requirements (PDF 95KB)

N/A

04/2013

Collection of data under the Private Water Supplies Regulations 2009 and the Private Water Supplies (Wales) Regulations 2010 (PDF 107KB)

1 - Return template (excel 440KB)
Updated September 2015
2 - Example return (excel 448KB)
Updated September 2015
3 - Specification (PDF 210KB)
Updated September 2015
FAQ (PDF 252KB)


2012

REF

TITLE

Annex

07/2012

Publication of further research on nitrosamines in water treatment coagulants and drinking water (PDF 102KB)

N/A

06/2012

Regulation 15 compliance arrangements (PDF 180KB)

N/A


2011

REF

TITLE

Annex

05/2011

Production, delivery, receipt and control of water treatment chemicals (PDF 101KB)

N/A

01/2011

Amendment to The Water Supply (Water Quality) Regulations 2010 (Wales) (PDF 92KB)

N/A


2010

REF

TITLE

Annex

11/2010

Guidance to local authorities in England on charging arrangements under the Private Water Supplies Regulation 2009 (PDF 106KB)

A - Letter (PDF 702KB)
B - Extract from guidance (PDF 55KB)

10/2010

Guidance on using contractors to deliver Local Authority duties under the Private Water Supplies Regulations (PDF 113KB)

N/A


2009

REF

TITLE

Annex

4/2009

Submission of raw water monitoring data to the Drinking Water Inspectorate (PDF 138KB)

A - Table format for reporting raw water (PDF 34KB)
B - Parameter code list (PDF 232KB)
B Parameter code list (excel 140KB)
Updated Jan 2017


2007

REF

TITLE

Annex

08/2007 

Guidance on interpretation of Regulation 16(2)(d)(i) of the Water Supply (Water Quality) Regulations 2000 (2001 in Wales) (PDF 87KB)

Guidance on implementation of Regulation 16(2)(d)(i) (PDF 130KB)


2005

REF

TITLE

Annex

12/2005

Guidance on sample and sample extract stability trials and the preservation and preparation of samples for metals analysis (PDF 135KB)

A - Guidance on sample and sample extract stability trials (PDF 169KB)
B - Sample preservation and preparation for metals analysis of drinking water (PDF 102KB)
C - Stability trial worked example (PDF 10KB)

03/2005

Guidance on the calibration and analytical quality control for residual chlorine measurements (PDF 76KB)

Guidance (PDF 169KB)

2004

REF

TITLE

Annex

11/2004

Information requirements following notification of an exceedence of a regulatory standard (PDF 80KB)

A - Pro forma (PDF 70KB)
B - Format for the submission of additional information (PDF 104KB)

10/2004

Monitoring drinking water at establishments where water is supplied to the public (PDF 91KB)

Categories and estimate of numbers (PDF 37KB)

05/2004

Commencement of Part 3 Provisions of Water Act 2003 (PDF 82KB)

N/A


2003

REF

TITLE

Annex

12/2003

Procedures for the Delivery of Water Treatment Chemicals (PDF 82KB)

N/A

06/2003

The Water Undertakers (Information) Direction 2003 - Format for provision of certain information (PDF 88KB)

A - Information Direction (PDF 40KB)
B - File specification (PDF 120KB) *Updated Nov 2017
C- Parameter code list* (PDF 257KB) *Updated Jan 2017

2001

REF

TITLE

Annex

02/2001

Water Supply (Water Quality) Regulations 1989: Guidelines for Calibration in Laboratories (PDF 251KB)

N/A


 

Page reviewed: 7 November 2017
Page modified: 7 November 2017

Drinking Water Inspectorate