NF ISO 24511
Activities relating to drinking water and wastewater services - Guidelines for the management of wastewater utilities and for the assessment of wastewater services
This document provides guidelines for the management of wastewater utilities and the assessment of wastewater services.This document is applicable to publicly and privately owned and operated wastewater utilities but does not favour any particular ownership or operational model.NOTE 1 Wastewater is always generated when water is used or consumed. Accordingly, sources of wastewater can be residential, industrial, commercial or institutional. Collected storm water or (melted) snow can also be considered as wastewater, as it often carries contaminants and pathogens picked up from air or ground surfaces on its way to a collection system. In certain circumstances, especially in undeveloped areas, sanitary waste is collected in an undiluted form.This document addresses wastewater systems in their entirety and is applicable to systems at any level of development (e.g. pit latrines, on-site systems, networks, treatment facilities).The following are within the scope of this document:— the definition of a language common to different stakeholders;— objectives for the wastewater utility;— guidelines for the management of wastewater utilities;— service assessment criteria and related examples of performance indicators, all without setting any target values or thresholds.The following are outside the scope of this document:— methods of design and construction of wastewater systems;— regulation of the management structure and the methodology of wastewater service activities of operation and management;— regulation of the content of contracts or subcontracts;— topics related to the systems inside buildings, between the point-of-discharge and the point-of-collection.
This document provides guidelines for the management of wastewater utilities and the assessment of wastewater services.
This document is applicable to publicly and privately owned and operated wastewater utilities but does not favour any particular ownership or operational model.
NOTE 1 Wastewater is always generated when water is used or consumed. Accordingly, sources of wastewater can be residential, industrial, commercial or institutional. Collected storm water or (melted) snow can also be considered as wastewater, as it often carries contaminants and pathogens picked up from air or ground surfaces on its way to a collection system. In certain circumstances, especially in undeveloped areas, sanitary waste is collected in an undiluted form.
This document addresses wastewater systems in their entirety and is applicable to systems at any level of development (e.g. pit latrines, on-site systems, networks, treatment facilities).
The following are within the scope of this document:
— the definition of a language common to different stakeholders;
— objectives for the wastewater utility;
— guidelines for the management of wastewater utilities;
— service assessment criteria and related examples of performance indicators, all without setting any target values or thresholds.
The following are outside the scope of this document:
— methods of design and construction of wastewater systems;
— regulation of the management structure and the methodology of wastewater service activities of operation and management;
— regulation of the content of contracts or subcontracts;
— topics related to the systems inside buildings, between the point-of-discharge and the point-of-collection.
ISO 24511:2007 provides guidelines for the management of wastewater utilities and for the assessment of wastewater services. ISO 24511:2007 is applicable to publicly and privately owned and operated wastewater utilities, but does not favour any particular ownership or operational model. ISO 24511:2007 addresses wastewater systems in their entirety and is applicable to systems at any level of development (e.g. pit latrines, on-site systems, networks, treatment facilities). The following are within the scope of ISO 24511:2007: the definition of a language common to different stakeholders; objectives for the wastewater utility; guidelines for the management of wastewater utilities; service assessment criteria and related examples of performance indicators, all without setting any target values or thresholds.
The Requirements department helps you quickly locate within the normative text:
- mandatory clauses to satisfy,
- non-essential but useful clauses to know, such as permissions and recommendations.
The identification of these types of clauses is based on the document “ISO / IEC Directives, Part 2 - Principles and rules of structure and drafting of ISO documents ”as well as on a constantly enriched list of verbal forms.
With Requirements, quickly access the main part of the normative text!

At a glance, you will be able to identify the additions, deletions or modifications to a text, table, figure and formula.

The Redlines + service is offered to you on the collection of French standards in force, in French language and in HTML and PDF format.
For an overview of the service, click on View a standard in redline format
COBAZ is the simple and effective solution to meet the normative needs related to your activity, in France and abroad.
Available by subscription, CObaz is THE modular solution to compose according to your needs today and tomorrow. Quickly discover CObaz!
Request your free, no-obligation live demo
I discover COBAZ