ISO INTERNATIONAL STANDARD 20469 First edition 2018-11 Guidelines for water quality grade classification for water reuse Lignes directrices pour la classification de la qualité de I'eau en vue de sa réutilisation Reference number IS0 20469:2018(E) osi @IS02018 IS0 20469:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0 20469:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope.. 2 Normative references 3 Terms and definitions 4 Water quality grade classification for reuse application 4.1 Water quality grade for reuse application. 1 4.2 Water quality grade classification ..2 5 Display of water quality grades ..5 Bibliography .6 @ IS0 2018 - All rights reserved ii