ISO 24566-4:2025

Drinking water, wastewater and stormwater systems and services — Adaptation of water services to climate change impacts — Part 4: Wastewater services

This document provides guidance and requirements for identifying and assessing impacts of climate change on wastewater systems and on developing strategies for the adaptation to these impacts. The assessment of the impacts is based on the assessment principles described in ISO 24566-1. This document also provides examples of some of the impacts of climate change on wastewater systems and of the responses that have been implemented by municipal water services or by the relevant jurisdiction (e.g. municipality or region served by the service). The examples of responses illustrate adaptation strategies that have been applied. NOTE Both combined and non-combined wastewater systems are included in this document regarding the activities of collection, transport, storage and treatment of wastewater.

Services et systèmes d’alimentation en eau potable, d’assainissement et de gestion des eaux pluviales — Adaptation des services de l’eau aux impacts du changement climatique — Partie 4: Services d’assainissement

Le présent document donne des recommandations et des exigences pour l’identification et l’évaluation des impacts du changement climatique sur les systèmes d’assainissement et au développement de stratégies d’adaptation à ces impacts. L’évaluation des impacts repose sur les principes d’évaluation décrits dans l’ISO 24566-1. Le présent document fournit également des exemples d’impacts du changement climatique sur les systèmes d’assainissement et de mesures mises en œuvre par les services municipaux de l’eau ou par la juridiction compétente (par exemple, municipalité ou région desservie par le service). Les exemples de mesures illustrent les stratégies d’adaptation qui ont été appliquées. NOTE Les systèmes d’assainissement unitaires et séparatifs sont inclus dans le présent document en ce qui concerne les activités de collecte, de transport, de stockage et de traitement des eaux usées.

General Information

• Status: Published
• Publication Date: 03-Sep-2025
• ICS: 03.080.30 - Services for consumers
• ICS: 13.020.30 - Environmental impact assessment
• ICS: 13.030.20 - Liquid wastes. Sludge
• Technical Committee: ISO/TC 224 - Drinking water, wastewater and stormwater systems and services
• Drafting Committee: ISO/TC 224 - Drinking water, wastewater and stormwater systems and services
• Current Stage: 6060 - International Standard published
• Start Date: 04-Sep-2025
• Due Date: 20-Jun-2025
• Completion Date: 04-Sep-2025

Standards Content (Sample)

International
Standard
ISO 24566-4
First edition
Drinking water, wastewater and
2025-09
stormwater systems and services —
Adaptation of water services to
climate change impacts —
Part 4:
Wastewater services
Services et systèmes d’alimentation en eau potable,
d’assainissement et de gestion des eaux pluviales — Adaptation
des services de l’eau aux impacts du changement climatique —
Partie 4: Services d’assainissement
Reference number
© ISO 2025
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviations . 1
4 Objectives . 3
5 Impacts of climate change on wastewater systems and responses . 3
5.1 General .3
5.2 Impacts .3
5.3 Responses .4
6 Methodology . 5
6.1 General .5
6.2 Key functions .5
7 Assessment of current situation, vulnerabilities and opportunities . 6
7.1 General .6
7.2 Description and characterisation of the current wastewater system .6
7.2.1 Typical assets of a system .6
7.2.2 Governance .6
7.2.3 Strategies .7
7.2.4 Risk management .7
7.2.5 Operation and asset management .7
7.2.6 Metrics and targets .8
7.3 Identification and assessment of current climate-related hazards to wastewater
services.9
7.3.1 Current climatic and hydrological conditions .9
7.3.2 Current climate-related hazards.10
7.4 Identification and assessment of current system risks and vulnerabilities. 13
7.4.1 General . 13
7.4.2 Governance . 13
7.4.3 Strategies . 13
7.4.4 Risk management .14
7.4.5 Operation and asset management .14
7.4.6 Metrics and targets .16
7.5 Assessment of current system opportunities .16
8 Assessment of future situation, vulnerabilities and opportunities . 17
8.1 Identification and assessment of the future climate change hazards .17
8.2 Identification and assessment of future vulnerabilities to the wastewater system .18
8.2.1 Governance .18
8.2.2 Strategies .19
8.2.3 Risk management .19
8.2.4 Operation and asset management .19
8.2.5 Metrics and targets .19
8.3 Assessment of future opportunities . 20
9 Financial assessments .20
9.1 General . 20
9.2 Financing adaptation .21
9.3 Cost-benefit analysis .21
10 Development of adaptation strategy .22
10.1 General . 22
10.2 Adaptation strategies . 22
10.2.1 General . 22

iii
10.2.2 Governance . 22
10.2.3 Strategies . 23
10.2.4 Risk management . 23
10.2.5 Operation and asset management .24
10.2.6 Metrics and targets .24
10.3 Assessment of revised system .24
10.4 Assessment protocols . 25
10.5 Implementation . . 25
11 Proposed templates .25
11.1 Template for response options and actions . 25
11.2 Template for response categorisations .27
12 Monitor, review and update .27
Annex A (informative) Examples of wastewater management responses.29
Bibliography .39

iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further m
...

Norme
internationale
ISO 24566-4
Première édition
Services et systèmes d’alimentation
2025-09
en eau potable, d’assainissement
et de gestion des eaux pluviales —
Adaptation des services de l’eau
aux impacts du changement
climatique —
Partie 4:
Services d’assainissement
Drinking water, wastewater and stormwater systems and
services — Adaptation of water services to climate change
impacts —
Part 4: Wastewater services
Numéro de référence
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2025
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse
ii
Sommaire Page
Avant-propos .v
Introduction .vi
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes, définitions et abréviations . 1
4 Objectifs . 3
5 Impacts du changement climatique sur les systèmes d’assainissement et mesures
d’adaptation . 3
5.1 Généralités .3
5.2 Impacts .3
5.3 Mesures d’adaptation .5
6 Méthodologie . 6
6.1 Généralités .6
6.2 Fonctions clés .6
7 Évaluation de la situation, des vulnérabilités et des opportunités actuelles . 6
7.1 Généralités .6
7.2 Description et caractérisation du système d’assainissement actuel .6
7.2.1 Actifs types d’un système . .6
7.2.2 Gouvernance .7
7.2.3 Stratégies .7
7.2.4 Gestion des risques .8
7.2.5 Exploitation et gestion des actifs .8
7.2.6 Indicateurs de suivi et valeurs cibles .8
7.3 Identification et évaluation des aléas actuels liés au climat pour les services
d’assainissement .10
7.3.1 Conditions climatiques et hydrologiques actuelles .10
7.3.2 Aléas climatiques actuels .10
7.4 Identification et évaluation des risques et vulnérabilités du système actuel .14
7.4.1 Généralités .14
7.4.2 Gouvernance .14
7.4.3 Stratégies .14
7.4.4 Gestion des risques . 15
7.4.5 Exploitation et gestion des actifs . 15
7.4.6 Indicateurs de suivi et valeurs cibles .17
7.5 Évaluation des opportunités du système actuel .18
8 Évaluation de la situation, des vulnérabilités et des opportunités futures .18
8.1 Identification et évaluation des aléas futurs liés au changement climatique.18
8.2 Identification et évaluation des vulnérabilités futures liées au système d’assainissement . 20
8.2.1 Gouvernance . 20
8.2.2 Stratégies . 20
8.2.3 Gestion des risques . 20
8.2.4 Exploitation et gestion des actifs .21
8.2.5 Indicateurs de suivi et valeurs cibles .21
8.3 Évaluation des futures opportunités .21
9 Évaluations financières .22
9.1 Généralités . 22
9.2 Financement de l’adaptation . 22
9.3 Analyse coût/bénéfice . 23
10 Développement de la stratégie d’adaptation .24
10.1 Généralités .24
10.2 Stratégies d’adaptation .24

iii
10.2.1 Généralités .24
10.2.2 Gouvernance .24
10.2.3 Stratégies . 25
10.2.4 Gestion des risques . 25
10.2.5 Exploitation et gestion des actifs . 26
10.2.6 Indicateurs de suivi et valeurs cibles . 26
10.3 Évaluation du système révisé .27
10.4 Protocoles d’évaluation .27
10.5 Mise en œuvre .27
11 Documents modèles proposés .28
11.1 Documents modèles pour les possibilités et mesures d’adaptation . 28
11.2 Document modèle de classification des mesures d’adaptation . 29
12 Surveiller, revoir et mettre à jour .30
Annexe A (informative) Exemples de mesures d’adaptation de gestion des eaux usées .32
Bibliographie .44

iv
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes nationaux
de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est en général
confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l’ISO participent également aux travaux. L’ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier de prendre note des différents
critères d’approbat
...

FINAL DRAFT
International
Standard
ISO/FDIS 24566-4
ISO/TC 224
Drinking water, wastewater and
Secretariat: AFNOR
stormwater systems and services —
Voting begins on:
Adaptation of water services to
2025-06-16
climate change impacts —
Voting terminates on:
2025-08-11
Part 4:
Wastewater services
Services et systèmes d’alimentation en eau potable,
d’assainissement et de gestion des eaux pluviales — Adaptation
des services de l’eau aux impacts du changement climatique —
Partie 4: Services d’assainissement
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 24566-4:2025(en) © ISO 2025

FINAL DRAFT
ISO/FDIS 24566-4:2025(en)
International
Standard
ISO/FDIS 24566-4
ISO/TC 224
Drinking water, wastewater and
Secretariat: AFNOR
stormwater systems and services —
Voting begins on:
Adaptation of water services to
climate change impacts —
Voting terminates on:
Part 4:
Wastewater services
Services et systèmes d’alimentation en eau potable,
d’assainissement et de gestion des eaux pluviales — Adaptation
des services de l’eau aux impacts du changement climatique —
Partie 4: Services d’assainissement
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 24566-4:2025(en) © ISO 2025

ii
ISO/FDIS 24566-4:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviations . 1
4 Objectives . 3
5 Impacts of climate change on wastewater systems and responses . 3
5.1 General .3
5.2 Impacts .3
5.3 Responses .4
6 Methodology . 5
6.1 General .5
6.2 Key functions .5
7 Assessment of current situation, vulnerabilities and opportunities . 6
7.1 General .6
7.2 Description and characterisation of the current wastewater system .6
7.2.1 Typical assets of a system .6
7.2.2 Governance .6
7.2.3 Strategies .7
7.2.4 Risk management .7
7.2.5 Operation and asset management .7
7.2.6 Metrics and targets .8
7.3 Identification and assessment of current climate-related hazards to wastewater
services.9
7.3.1 Current climatic and hydrological conditions .9
7.3.2 Current climate-related hazards.10
7.4 Identification and assessment of current system risks and vulnerabilities. 13
7.4.1 General . 13
7.4.2 Governance . 13
7.4.3 Strategies . 13
7.4.4 Risk management .14
7.4.5 Operation and asset management .14
7.4.6 Metrics and targets .16
7.5 Assessment of current system opportunities .16
8 Assessment of future situation, vulnerabilities and opportunities . 17
8.1 Identification and assessment of the future climate change hazards .17
8.2 Identification and assessment of future vulnerabilities to the wastewater system .18
8.2.1 Governance .18
8.2.2 Strategies .19
8.2.3 Risk management .19
8.2.4 Operation and asset management .19
8.2.5 Metrics and targets .19
8.3 Assessment of future opportunities . 20
9 Financial assessments .20
9.1 General . 20
9.2 Financing adaptation .21
9.3 Cost-benefit analysis .21
10 Development of adaptation strategy .22
10.1 General . 22
10.2 Adaptation strategies . 22
10.2.1 General . 22

iii
ISO/FDIS 24566-4:2025(en)
10.2.2 Governance . 22
10.2.3 Strategies . 23
10.2.4 Risk management . 23
10.2.5 Operation and asset management .24
10.2.6 Metrics and targets .24
10.3 Assessment of revised system .24
10.4 Assessment protocols . 25
10.5 Implementation . . 25
11 Proposed templates .25
11.1 Template for response options and actions . 25
11.2
...

ISO/FDIS 24566-4:2025(en)
ISO/TC 224/WG 16
Secretariat: AFNOR
Date: 2024-08-192025-05-28
Drinking water, wastewater and stormwater systems and services —
Adaptation of water services to climate change impacts — —
Part 4:
Wastewater services
Services et systèmes d’alimentation en eau potable, d’assainissement et de gestion des eaux pluviales —
Adaptation des services de l’eau aux impacts du changement climatique —
Partie 4: Services d’assainissement
FDIS stage
General
ISO/FDIS 24566-4:2025(en)
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
EmailE-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
General
ii
ISO/DISFDIS 24566-4:2025(en)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviations . 1
4 Objectives . 3
5 Impacts of climate change on wastewater systems and responses . 3
5.1 General . 3
5.2 Impacts . 3
5.3 Responses . 5
6 Methodology . 6
6.1 General . 6
6.2 Key functions . 6
7 Assessment of current situation, vulnerabilities and opportunities . 6
7.1 General . 6
7.2 Description and characterisation of the current wastewater system . 7
7.3 Identification and assessment of current climate-related hazards to wastewater services11
7.4 Identification and assessment of current system risks and vulnerabilities . 15
7.5 Assessment of current system opportunities . 19
8 Assessment of future situation, vulnerabilities and opportunities . 20
8.1 Identification and assessment of the future climate change hazards . 20
8.2 Identification and assessment of future vulnerabilities to the wastewater system . 22
8.3 Assessment of future opportunities . 23
9 Financial assessments . 24
9.1 General . 24
9.2 Financing adaptation . 24
9.3 Cost-benefit analysis . 25
10 Development of adaptation strategy . 26
10.1 General . 26
10.2 Adaptation strategies . 26
10.3 Assessment of revised system . 28
10.4 Assessment protocols . 29
10.5 Implementation . 29
11 Proposed templates . 30
11.1 Template for response options and actions . 30
11.2 Template for response categorisations . 31
12 Monitor, review and update . 32
Annex A (informative) Examples of wastewater management responses . 34
Bibliography . 45

General
iii
ISO/FDIS 24566-4:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO'sISO’s adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 224, Drinking water, wastewater and
stormwater systems and services.
A list of all parts in the ISO 24566 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
General
iv
ISO/DISFDIS 24566-4:2025(en)
Introduction
The fact that occurrence of climate change is occurring is recognized globally. Accordingly, mitigation and
adaptation programsprogrammes have been introduced in many nations, and internationally through a
number of agreements.
At the local levelLocally, operators of water services have had to assess the impacts and options for responding
to the effects of climate change, some of which are slow and long-term, while others are acute, arising from
extreme weather events and changes.
This document gives guidance and requirements for identifying impacts of climate change to wastewater
systems, on developing strategies for the adaptation to these impacts, and provides examples of responses
taken in respect of wastewater systems.
General
v
DRAFT International Standard ISO/DIS 24566-4:2024(en)

Drinking water, wastewater and stormwater systems and services —
Adaptation of water services to climate change impacts — —
Part 4:
Wastewater services
1 Scope
This document provides guidance and requirements for identifying and assessing impacts of climate change
on wastewater systems and on developing strategies for the adaptation to these impacts. The assessment of
the impacts is based on the assessment principles described in ISO 24566-1.
This document also provides examples of some of the impacts of climate change on wastewater systems and
of the responses that have been implemented by municipal water services or by the relevant jurisdiction (e.g.
municipality or region served by the service). The examples of responses illustrate adaptation strategies that
have been applied.
NOTE Both combined and non-combined wastewater systems are included in this document regarding the activities
of collection, transport, storage and treatment of wastewater.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 24513, Service activities relating to drinking water supply, wastewater and stormwater systems —
Vocabulary
3 Terms, definitions and abbreviations
For the purposes of this document, the terms and definitions providedgiven in ISO 24513:2019 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
adaptation to climate change
process of adjustment to actual or expected climate and its effects
Note 1 to entry: In human systems, adaptation seeks to moderate or avoid harm or exploit beneficial opportunities.
Note 2 to entry: In some natural systems, human intervention can facilitate adjustment to expected climate and its effects.
General
ISO/FDIS 24566-4:2025(en)
[SOURCESSOURCE: ISO 14090:201914030-3:2022, 3.1.4.10, modified — The preferred term “admitted terms
“climate change adaptation” hasand “adaptation” have been added; ISO 14030-3:2022(en),
3.1.4.10]removed.]
3.2 3.2
climate risk
potential of negative climate change impacts that reflects the interaction among vulnerability, climate change
exposure and hazard
[SOURCE: ISO 14050:2020, 3.8.12] , modified — The preferred term “climate change risk” has been removed.]
3.3
3.3
data
recorded information
[SOURCE: ISO 22005:2007(en),, 3.11]
3.4
3.4
governance
system of directing and controlling
1)
[SOURCE: ISO/IEC 38500:2015, , 2.8]
3.5 3.5
hydrogen sulphide
H S
colourless, toxic gas with an odour similar to rotten eggs
[SOURCE: ISO 14532:2014(en),, 2.5.2.3.7]
3.6 3.6
methane
CH
gas originating from both from natural and anthropogenic sources of relevance to the climate (greenhouse
gas) that contributes directly to the atmospheric greenhouse effect. The emissions of methane originate
Note 1 to Entry: definition not found in ISO OBP, and adapted from the introduction of entry: Adapted from
ISO 25140:2010(en).
3.7 3.7
metric
verifiable measure that captures performance in terms of how something is being done relative to a standard,
allows and encourages comparison, supports business strategy
[SOURCE: ISO/TS 18864:2017(en),, 3.20]
3.8 3.8
strategy
organization'sorganization’s approach to achieving its objectives

1)
Withdrawn.
© ISO #### 2025 – All rights reserved
General
ISO/DISFDIS 24566-4:2025(en)
1)
[SOURCE: ISO 30400:2016(en2016 , 3.5]
3.9 3.9
was
...

PROJET FINAL
Norme
internationale
ISO/FDIS 24566-4
ISO/TC 224
Services et systèmes d’alimentation
Secrétariat: AFNOR
en eau potable, d’assainissement
Début de vote:
et de gestion des eaux pluviales —
2025-06-16
Adaptation des services de l’eau
Vote clos le:
aux impacts du changement
2025-08-11
climatique —
Partie 4:
Services d’assainissement
Drinking water, wastewater and stormwater systems and
services — Adaptation of water services to climate change
impacts —
Part 4: Wastewater services
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
ISO/FDIS 24566-4:2025(fr) © ISO 2025

PROJET FINAL
ISO/FDIS 24566-4:2025(fr)
Norme
internationale
ISO/FDIS 24566-4
ISO/TC 224
Services et systèmes d’alimentation
Secrétariat: AFNOR
en eau potable, d’assainissement
Début de vote:
et de gestion des eaux pluviales —
2025-06-16
Adaptation des services de l’eau
Vote clos le:
aux impacts du changement
2025-08-11
climatique —
Partie 4:
Services d’assainissement
Drinking water, wastewater and stormwater systems and
services — Adaptation of water services to climate change
impacts —
Part 4: Wastewater services
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Publié en Suisse Numéro de référence
ISO/FDIS 24566-4:2025(fr) © ISO 2025

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ISO/FDIS 24566-4:2025(fr)
Sommaire Page
Avant-propos .v
Introduction .vi
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes, définitions et abréviations . 1
4 Objectifs . 3
5 Impacts du changement climatique sur les systèmes d’assainissement et mesures
d’adaptation . 3
5.1 Généralités .3
5.2 Impacts .3
5.3 Mesures d’adaptation .5
6 Méthodologie . 6
6.1 Généralités .6
6.2 Fonctions clés .6
7 Évaluation de la situation, des vulnérabilités et des opportunités actuelles . 6
7.1 Généralités .6
7.2 Description et caractérisation du système d’assainissement actuel .6
7.2.1 Actifs types d’un système . .6
7.2.2 Gouvernance .7
7.2.3 Stratégies .7
7.2.4 Gestion des risques .8
7.2.5 Exploitation et gestion des actifs .8
7.2.6 Indicateurs de suivi et valeurs cibles .8
7.3 Identification et évaluation des aléas actuels liés au climat pour les services
d’assainissement .10
7.3.1 Conditions climatiques et hydrologiques actuelles .10
7.3.2 Aléas climatiques actuels .10
7.4 Identification et évaluation des risques et vulnérabilités du système actuel .14
7.4.1 Généralités .14
7.4.2 Gouvernance .14
7.4.3 Stratégies .14
7.4.4 Gestion des risques . 15
7.4.5 Exploitation et gestion des actifs . 15
7.4.6 Indicateurs de suivi et valeurs cibles .17
7.5 Évaluation des opportunités du système actuel .18
8 Évaluation de la situation, des vulnérabilités et des opportunités futures .18
8.1 Identification et évaluation des aléas futurs liés au changement climatique.18
8.2 Identification et évaluation des vulnérabilités futures liées au système d’assainissement . 20
8.2.1 Gouvernance . 20
8.2.2 Stratégies . 20
8.2.3 Gestion des risques . 20
8.2.4 Exploitation et gestion des actifs .21
8.2.5 Indicateurs de suivi et valeurs cibles .21
8.3 Évaluation des futures opportunités .21
9 Évaluations financières .22
9.1 Généralités . 22
9.2 Financement de l’adaptation . 22
9.3 Analyse coût/bénéfice . 23
10 Développement de la stratégie d’adaptation .24
10.1 Généralités .24
10.2 Stratégies d’adaptation .24

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ISO/FDIS 24566-4:2025(fr)
10.2.1 Généralités .24
10.2.2 Gouvernance .24
10.2.3 Stratégies . 25
10.2.4 Gestion des risques . 25
10.2.5 Exploitation et gestion des actifs . 26
10.2.6 Indicateurs de suivi et valeurs cibles . 26
10.3 Évaluation du système révisé .27
10.4 Protocoles d’évaluation .27
10.5 Mise en œuvre .27
11 Documents modèles proposés .28
11.1
...