ISO/TC 224 - Drinking water, wastewater and stormwater systems and services

This document provides examples of good practices in stormwater management related to ISO 24536 and information on standards and guidelines used in various countries.

This document provides a methodology for undertaking a water loss investigation and establishing general principles for water loss management in drinking water distribution networks in order to improve the sustainability of drinking water utilities and protect the environment by saving water, energy and use of chemicals. This document establishes a procedure to estimate water loss components through water balance calculations and to define general principles of water loss management. This document deals with the preparation of a water loss management plan for water loss reduction and management projects but does not cover its execution. This document does not cover bulk drinking water supply systems, but can relate to pumping, storage and transmission within the drinking water distribution network. This document can be used analogously for non-public supply systems, raw water and industrial water systems. This document is intended for drinking water utilities and other stakeholders.

This document specifies guidelines for the implementation of continuous monitoring systems for drinking water quality and operational parameters in drinking water distribution networks. 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.

This document provides guidelines on alternative drinking water service (ADWS) provision during a crisis. This document addresses: a) ADWS principles and methods; b) ADWS operational planning and implementation. This document is not applicable to: 1) planned water supply interruptions forming part of drinking water utilities' normal operations; NOTE However, many of the principles and methods described can be appropriate in such circumstances. 2) drinking water supplied for the ongoing operation of key establishments and facilities during a crisis, such as hospitals, homes for the aged, schools, reception facilities and vital plants; 3) water supplied for industrial, agricultural or commercial purposes; 4) water supplied to temporary settlements such as refugee camps; 5) the development and implementation of a crisis management system for water service, which is covered by ISO 24518 and ISO/TS 24520.

This document provides guidance to stormwater management authorities and relevant stakeholders on both structural and non-structural stormwater management approaches. The guidance includes consideration of relevant policies, planning, design criteria and implementation processes for stormwater management, and performance evaluation. This document can be applied to new stormwater systems and to the extension or improvement of existing systems for both fully separated and combined storm and sanitary sewers. This document is applicable to stormwater sewer systems as well as combined sewer systems. This document is not applicable to sanitary sewer systems.

This document specifies requirements and contains guidance for its use in establishing, implementing and maintaining a water efficiency management system. It is applicable to organizations of all types and sizes that use water. It is focused on end-use consumers. This document is applicable to any organization that wishes to: a) achieve the efficient use of water through the ?reduce, replace or reuse' approach; b) establish, implement and maintain water efficiency; c) continually improve water efficiency. This document specifies requirements and contains guidance for its use regarding organizational water use. It includes monitoring, measurement, documentation, reporting, design and procurement practices for equipment, systems, processes and personnel training that contribute to water efficiency management. NOTE 1 ?Reduce' includes the use of water-efficient fittings and equipment and, for example, putting in place a proper monitoring system for usage and leak detection. NOTE 2 ?Replace' includes substitution of drinking water with reclaimed water, sea water and rainwater wherever feasible. NOTE 3 ?Reuse' includes recycling of, for example, process water or grey water. For utilizing water reuse systems, ISO/TC 282 documents can be referred to as guidelines. NOTE 4 Guidance in the annexes provides additional practical information to support implementation. Annex A provides guidance on the use of this document and Annex B gives examples of scenarios in water efficiency.

This document specifies guidelines for technical aspects, tools and good practices for the management of assets of waterworks to maintain value from existing assets. This document includes the following asset types: treatment plants, sludge treatment facilities, pumping stations, reservoirs, tanks and dosing equipment, metering and ancillary infrastructure irrespective of where they are sited, in the waterworks or in the drinking water distribution network. For further guidance on drinking water distribution networks see ISO 24516-1. NOTE 1 The management of transmission mains is addressed in ISO 24516-1 irrespective of where these assets are sited in the drinking water system. This document is focused on the assets typically owned or operated by drinking water utilities (drinking water systems) that in parts are expected to meet users' needs and expectations over longer (multi-generational) periods. This document includes examples of good practice approaches on the strategic, tactical and operational levels. This document is applicable to all types and sizes of organization and/or utilities operating drinking water systems. NOTE 2 Depending on the size and structure of an organization, the utility can decide to what extent it applies the guidance in this document. In any case, the philosophy of this document remains applicable even to small and medium utilities. NOTE 3 This includes all different roles/functions for the management of assets within a utility (e.g. asset owner/responsible body, asset manager/operator, service provider/operator).

This document specifies guidelines for technical aspects, tools and good practices for the management of assets of wastewater treatment plants, sludge treatment facilities, pumping stations, and retention and detention facilities in the wastewater system to maintain the value of existing assets. NOTE 1 For simplicity in reading this document, reference to wastewater treatment plants includes all the asset types described above. For further guidance on wastewater networks see ISO 24516-3. NOTE 2 For simplicity of interpretation of wastewater system assets, the management of pumping stations and retention and detention facilities in the network, excluded from ISO 24516-3, is addressed in this document irrespective of where these assets are sited in the wastewater system. This document is focused on the assets in wastewater systems typically owned or operated by wastewater utilities that are expected to meet users' needs and expectations over longer, sometimes multi-generational, periods. This document includes examples of good practice approaches on the strategic, tactical and operational levels. This document is applicable to all types and sizes of organizations and/or utilities operating wastewater systems. NOTE 3 Depending on the size and structure of an organization, the utility can decide to what extent it applies the guidance in this document. In any case, the philosophy of this document remains applicable even to small and medium utilities. NOTE 4 This includes all different roles/functions for the management of assets within a utility (e.g. asset owner/responsible body, asset manager/operator, service provider/operator).

This document defines individual concepts that together constitute a vocabulary common to different stakeholders with interests in water service provision. It is intended to facilitate common understanding and communication on the provision and management of service activities relating to drinking water supply, wastewater and stormwater systems. The following are within the scope of this document: — definition of a vocabulary common to the different stakeholders; — definition of key elements and characteristics of the service to users; — definition of the components of drinking water supply, wastewater and stormwater systems.

This document provides guidance for water utilities on the detection and classification of water and wastewater events. 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/TR 24524:2019 details the hydraulic, mechanical and environmental conditions generally found in wastewater transport systems from toilets through to wastewater treatment plants, the general powers of wastewater services to manage discharges to sewers, and the responsibilities imposed on wastewater services by applicable local, regional or national legislation.

This document provides several examples of varying complexity which illustrate the use and intent of the performance assessment methodology set out in ISO 24510, ISO 24511 and ISO 24512. The document also provides examples of the parallel and similar practices for measuring performance or establishing benchmarks as found in various institutional circumstances. These examples represent practices in a range of utilities (e.g. small, medium and large water utilities; water utilities from developed and developing countries; water utilities in both the public and private sectors; government and non-governmental agencies; and utilities with and without certified management systems). They are drawn from many geographical locations.

ISO/TS 24520:2017 provides guidance to water utilities on good practice in technical aspects of crisis management. 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.

ISO 24516-3:2017 specifies guidelines for technical aspects, tools and good practices for the management of assets of wastewater networks to maintain value from existing assets. ISO 24516-3:2017 does not apply to the management of assets of treatment plants, which are also physically part of the wastewater system and can influence the management of network assets. NOTE 1 The management of the following individual assets will be covered by ISO 24516‑4: wastewater pumping stations, retention and detention in the network, wastewater treatment plants and sludge treatment facilities. ISO 24516-3:2017 includes examples of good practice approaches on the strategic, tactical and operational levels. ISO 24516-3:2017 is applicable to all types and sizes of organizations and/or utilities operating wastewater networks, and all different roles/functions for the management of assets within a utility (e.g. asset owner/responsible body, asset manager/operator, service provider/operator). NOTE 2 Depending on the size and structure of an organization, the utility can decide to what extent it applies the guidance in this document, but in any case, the philosophy of this document remains applicable to small and medium utilities.

ISO 24523:2017 provides guidelines on good benchmarking practice of drinking water and wastewater utilities. It describes the basic framework and methods associated with benchmarking in the water sector. The guidelines are intended primarily for voluntary benchmarking. Specific objectives set forth by the authorities and which are to be achieved by the water utility are not covered by this document. 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.

ISO 24516-1:2016 specifies guidelines for technical aspects, tools and good practices for the management of assets of drinking water networks to maintain value from existing assets. ISO 24516-1:2016 does not apply to the management of assets of waterworks (including catchment and treatment, pumping and storage in the network), which are also physically part of the drinking water system and can influence the management of assets of the pipe network. ISO 24516-1:2016 focuses on the assets typically owned or operated by drinking water utilities (networked drinking water systems) that are expected to meet customer needs and expectations over longer (multi-generational) periods. ISO 24516-1:2016 includes examples for good practice approaches on the strategic, tactical and operational levels. ISO 24516-1:2016 is applicable to all types and sizes of organization and/or utilities operating drinking water systems, and all different roles/functions for the management of assets within a utility (e.g. asset owner/responsible body, asset manager/operator, service provider/operator).

ISO 24521:2016 provides guidance for the management of basic on-site domestic wastewater services, using appropriate technologies in their entirety at any level of development. ISO 24521:2016 supplements and is intended to be used in conjunction with ISO 24511. It includes the following: · guidelines for the management of basic on-site domestic wastewater services from the operator's perspective, including maintenance techniques, training of personnel and risk considerations; · guidelines for the management of basic on-site domestic wastewater services from the perspective of users; · guidance on the design and construction of basic on-site domestic wastewater systems; · guidance on planning, operation and maintenance, and health and safety issues. The following are outside the scope of ISO 24521:2016: · limits of acceptability for wastewater discharged into a receiving body; · analytical methods; · the management structure of sanitary waste/wastewater service activities of operation and management; · the content of contracts or subcontracts. ISO 24521:2016 is applicable to both publicly and privately operated basic on-site domestic wastewater (black and grey water) services, for one or more dwellings.

ISO 24518:2015 provides general guidance to water utilities to develop and implement a crisis management system. ISO 24518:2015 may be applicable to all sizes of public or private water utilities that want to prepare, respond, and recover from a crisis.

ISO 24510:2007 specifies the elements of drinking water and wastewater services of relevance and interest to users. It also provides guidance on how to identify users' needs and expectations and how to assess whether they are being met. The following are within the scope of ISO 24510:2007: the definition of a language common to the different stakeholders; the definition of key elements and characteristics of the service to users; the objectives for the service with respect to users' needs and expectations; guidelines for satisfying users' needs and expectations; service to users assessment criteria; introduction to performance indicators; examples of performance indicators.

ISO 24512:2007 provides guidelines for the management of drinking water utilities and for the assessment of drinking water services. ISO 24512:2007 is applicable to publicly and privately owned and operated water utilities. It does not favour any particular ownership or operating model. ISO 24512:2007 addresses drinking water systems in their entirety and is applicable to systems at any level of development (e.g. on-site systems, distribution networks, treatment facilities). The following are within the scope of ISO 24512:2007: the definition of a language common to different stakeholders; the definition of the components of drinking water supply systems; guidelines for the management of drinking water utilities; guidelines for objectives, service assessment criteria and related performance indicators, appropriate for the assessment of drinking water services.

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.

IWA 6:2008 is intended to identify and chart the critical elements that are of great significance to drinking water security. Its purpose is to set in motion a continuous process for the establishment of guidelines on management systems for drinking water utilities under crisis conditions. IWA 6:2008 provides the guidelines for a water utility, or any body responsible for the management of parts of the water supply system, to be prepared and ready to manage a water crisis. It also provides a roadmap for possible relevant International Standards that could be useful and could be developed.