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Guidelines for Drinking-water Quality
FIRST ADDENDUM TO THIRD EDITION
Volume 1 Recommendations

WHO Library Cataloguing-in-Publication Data World Health Organization. Guidelines for drinking-water quality [electronic resource] : incorporating first addendum. Vol. 1, Recommendations. – 3rd ed. Electronic version for the Web. 1.Potable water – standards. 2.Water – standards. 3.Water quality –standards. 4.Guidelines. I. Title. ISBN 92 4 154696 4 (NLM classification: WA 675)

© World Health Organization 2006 All rights reserved. Publications of the World Health Organization can be obtained from WHO Press, World Health Organization, 20 Avenue Appia, 1211 Geneva 27, Switzerland (tel: +41 22 791 3264; fax: +41 22 791 4857; email: bookorders@who.int). Requests for permission to reproduce ortranslate WHO publications – whether for sale or for noncommercial distribution – should be addressed to WHO Press, at the above address (fax: +41 22 791 4806; email: permissions@who.int). The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the World Health Organization concerning the legal statusof any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. Dotted lines on maps represent approximate border lines for which there may not yet be full agreement. The mention of specific companies or of certain manufacturers’ products does not imply that they are endorsed or recommended by the World Health Organization in preferenceto others of a similar nature that are not mentioned. Errors and omissions excepted, the names of proprietary products are distinguished by initial capital letters. All reasonable precautions have been taken by WHO to verify the information contained in this publication. However, the published material is being distributed without warranty of any kind, either expressed or implied. Theresponsibility for the interpretation and use of the material lies with the reader. In no event shall the World Health Organization be liable for damages arising from its use.

Contents

Preface Acknowledgements Acronyms and abbreviations used in text 1. Introduction 1.1 General considerations and principles 1.1.1 Microbial aspects 1.1.2 Disinfection 1.1.3 Chemical aspects 1.1.4 Radiological aspects1.1.5 Acceptability aspects 1.2 Roles and responsibilities in drinking-water safety management 1.2.1 Surveillance and quality control 1.2.2 Public health authorities 1.2.3 Local authorities 1.2.4 Water resource management 1.2.5 Drinking-water supply agencies 1.2.6 Community management 1.2.7 Water vendors 1.2.8 Individual consumers 1.2.9 Certification agencies 1.2.10 Plumbing 1.3 Supportingdocumentation to the Guidelines 2. The Guidelines: a framework for safe drinking-water 2.1 Framework for safe drinking-water: requirements 2.1.1 Health-based targets 2.1.2 System assessment and design 2.1.3 Operational monitoring 2.1.4 Management plans, documentation and communication 2.1.5 Surveillance of drinking-water quality
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GUIDELINES FOR DRINKING-WATER QUALITY

2.2

2.3

2.4

Guidelines for verification 2.2.1 Microbial water quality 2.2.2 Chemical water quality National drinking-water policy 2.3.1 Laws, regulations and standards 2.3.2 Setting national standards Identifying priority drinking-water quality concerns 2.4.1 Assessing microbial priorities 2.4.2 Assessing chemical priorities

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3. Health-based targets 3.1 Role and purpose of health-based targets 3.2 Types of health-based targets 3.2.1 Specified technology targets 3.2.2 Performance targets 3.2.3 Water quality targets 3.2.4 Health outcome targets 3.3 General considerations in establishing health-based targets...
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