It provides guidance for determining the:

— effective number of continuous monitoring stations in the drinking water distribution network;

— location of monitoring stations in the drinking water distribution network;

— types of operational and drinking water quality parameter measuring devices (MDs) that can be installed in a continuous monitoring station;

— quality control, maintenance and calibration requirements of the continuous monitoring system.

This document excludes guidance on the design, structure, number and type of MDs to be installed in a continuous monitoring system.

The following subjects are within the scope of this document:

— publicly and privately owned and operated water utilities. It does not favour any particular ownership or operating model;

— all aspects of the drinking water system and the wastewater system;

— all causes of abnormal changes in water and/or wastewater service provision capable of detection by monitoring systems including accidents, unexpected operational changes, natural hazards and intentional disruption.

This document is independent of the measurement methods used to collect the data.

The document focuses on events which could imminently affect the water utility's interested parties.

The following are outside the scope of this document:

— methods of design and construction of drinking water and wastewater systems;

— plumbing and drainage systems not under the control of the water utility.

This document does not include details about action taken as a result of event detection. For such details see ISO 24518 and EN 15975 Part 1.

ISO/TS 24520:2017 is applicable to all water utilities, of whatever size, whether public or private, that wish to review the effectiveness and efficiency of their service activities relating to preparation for, response to and recovery from a crisis.

The guidance given in ISO 5667-5:2006 is confined to those circumstances where water is drawn from municipal or similar distribution systems (including individual systems) where prior treatment and/or quality assessment has resulted in the water being classified as suitable for drinking or potable process purposes. Specifically, ISO 5667-5:2006 is applicable to water that is in continuous supply relative to any stage of use up to and including the point of consumption in a distribution system. This includes distribution within large buildings in which additional water quality management might be applicable.

ISO 5667-5:2006 is also applicable to sampling situations that can arise relative to the investigation of system defects or emergency situations where the safety of sampling operatives is not compromised.

ISO 5667-5:2006 does not provide guidance for water sources or for products generated by using drinking water. The followings items are examples of cases not addressed by the present document: the sampling of source water, for example groundwater and surface water impoundments; sampling of drinking water supplies derived from non-continuous sources (for example, from road tankers); sampling of bulk storage of water on airplanes, trains and ships; the sampling of beverage products (including bottled waters) or food containing potable water used in its preparation; sampling of drink vending machines that dispense unsealed cups of drinks.

The guidance given in ISO 5667-21:2010 is generally confined to those circumstances where water is drawn from municipal or similar public or private abstraction, treatment or distribution systems for which prior treatment or quality assessment has resulted in the water being classified as suitable for drinking or potable process purposes. Specifically, ISO 5667-21:2010 is applicable to water that is supplied by tanker or other non-contiguous bulk means, but not contiguously as part of a piped distribution system, during any stage of use up to and including the point of consumption or transfer to a piped distribution system. ISO 5667-21:2010 is also applicable to the distribution and bulk storage of water on aircraft, trucks, trains, ships, and other vessels and vehicles, as well as to sampling situations that can arise during the investigation of system defects, initiation of new systems, re-initiation of systems that have been unused for long periods or emergency situations where the safety of sampling operatives is not compromised.

ISO 5667-21:2010 does not provide guidance on: a) the sampling of source water, e.g. groundwater and impoundments; b) the sampling of potable water supplies derived from contiguous piped supplies covered by ISO 5667-5; c) the sampling of beverage products (including bottled waters) or food containing potable water used in its preparation; d) the sampling of drink vending machines.

Le présent document établit une procédure d'estimation des composantes des pertes d'eau par des calculs liés au bilan hydrique et à définir les principes généraux de la gestion des pertes d'eau. Il traite de la préparation d'un plan de gestion des pertes d'eau en vue de projets de réduction et de gestion des pertes d'eau, mais n'aborde pas sa mise en œuvre.

Le présent document ne couvre pas les systèmes d'alimentation en eau potable en gros, mais peut faire référence au pompage, au stockage et au transport au sein du réseau de distribution d'eau potable.

Le présent document peut être utilisé de manière analogue pour les systèmes d'alimentation non publics ainsi que les systèmes d'eaux brutes et d'eaux industrielles.

Il est destiné aux services publics d'eau potable et aux autres parties intéressées.

ISO 24523:2017 is applicable to water utilities of any size managed by a public or private entity. It does not favour any particular ownership or operating model.