National foreword

This British Standard is the UK implementation of EN 1420:2026. It supersedes BS EN 14395‑1:2004, BS EN 13052‑1:2001 and BS EN 1420:2016, which are withdrawn.

The UK participation in its preparation was entrusted to Technical Committee EH/6, Effects of materials on water quality.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2026.

This European Standard was approved by CEN on 20 March 2026.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and United Kingdom.

European foreword

This document (EN 1420:2026) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2026, and conflicting national standards shall be withdrawn at the latest by October 2026.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 1420:2016, EN 13052‑1:2001 and EN 14395‑1:2004.

With regard to the previous edition EN 1420:2016, EN 13052‑1:2001 and EN 14395‑1:2004the following changes were made:

the test methods for turbidity and colour have been included,
the scope of the document has been extended: all organic products (included storage systems) can be tested according to this document.

This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association.

Any feedback and questions on this document should be directed to the users’ national standards body. A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United Kingdom.

Introduction

This document is intended to safeguard the quality of drinking water for human consumption by providing a framework for monitoring and evaluating potential adverse effects arising from contact with materials used in conveyance and distribution systems. The adverse effects considered are limited to changes in odour, taste, colour, and turbidity.

1 Scope

This document specifies a procedure for obtaining a migration water to determine odour, flavour, colour and turbidity for products made from organic materials intended to come in contact with water for human consumption (drinking water) and used in piping and storage systems. Such products include pipes, tanks, reservoirs, fittings, ancillaries and their coatings both for site applied and factory-made products.

This document is applicable to products to be used under various conditions for the transport, storage and distribution of water intended for human consumption and raw water used for the manufacture of water intended for human consumption.

This document specifies a test method comprising a set of procedures. The use may be dependent on the relevant national regulations and/or the Commission Implementing Decision (EU) 2024/368.

2 Normative references

3 Terms and definitions

4 Principle

5 Reagents

5.1 Waters to be used for testing

5.2 Sodium hypochlorite solution

5.3 Sodium thiosulfate solution

5.4 Ascorbic acid solution

5.5 1-Butanol (analytic reagent grade)

5.6 2-Methoxy-2-methylpropane (Methyl-tert-butyl ether, MtBE) (analytic reagent grade)

5.7 Cleaning liquids for glassware

6 Apparatus

6.1

6.2

6.3

6.4

6.5

6.6

7 Sampling, transport, storage, and preparation of test pieces

7.1 General

7.2 Site-applied products

7.3 Surface-area-to-volume ratio (S/V)

8 Preparation of reagents and apparatus

8.1 Test water

8.2 Test water with chlorine content

8.3 Cleaning of glassware

9 Pre-treatment of test pieces

9.1 General

9.2 Test pieces to be tested at (23 ± 2) °C (cold water test)

9.3 Test pieces to be tested at (60 ± 2) °C (warm water test) or at (85 ± 2) °C (hot water test)

9.4 Prewashing

10 Test procedure

10.1 General

10.2 Cold water test procedure

10.3 Elevated temperature test procedure

11 Determination of TON and TFN

12 Determination of colour and turbidity

13 Expression of results

14 Test report

14.1 General information

14.2 Information on the product/material

14.3 Information for site-applied products

14.4 Information on the test procedure

14.5 Test results

Bibliography