MSB/TC 11 – MSB

MS ISO 24512:2024 Activities relating to drinking water and wastewater services — Guidelines for the management of drinking water utilities and for the assessment of drinking water services

Mushiirah — Sat, 26 Sep 2026 09:44:23 +0000

Scope:

This document provides guidelines for the management of drinking water utilities and the assessment of drinking water services.
This document is applicable to publicly and privately owned and operated water utilities. It does not favour any particular ownership or operating model.
This document 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 this document:
— 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.

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Standard number	MS ISO 24512:2024
Title and Sub-titles	Activities relating to drinking water and wastewater services — Guidelines for the management of drinking water utilities and for the assessment of drinking water services
Status	Current
Replaces	MS ISO 24512:2007
Replaced by
Edition	Second
Technical Committee	MSB/TC 11 - Environmental Management
ICS	93.025; 03.080.30; 13.060.20
Publication date	2025/05/24
Corrected version
Government Notice No.	General Notice No. 803 of 2025
Number of Pages	51
Amendments/ Corrigendums
Availability	Yes
Note

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MS ISO 24511:2024 Activities relating to drinking water and wastewater services — Guidelines for the management of wastewater utilities and for the assessment of wastewater services

Mushiirah — Sat, 26 Sep 2026 09:37:33 +0000

Scope:

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.

General Information
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Standard number	MS ISO 24511:2024
Title and Sub-titles	Activities relating to drinking water and wastewater services — Guidelines for the management of wastewater utilities and for the assessment of wastewater services
Status	Current
Replaces	MS ISO 24511:2007
Replaced by
Edition	Second
Technical Committee	MSB/TC 11 - Environmental Management
ICS	93.030; 03.080.30; 13.060.30
Publication date	2025/05/24
Corrected version
Government Notice No.	General Notice No. 803 of 2025
Number of Pages	57
Amendments/ Corrigendums
Availability	Yes
Note

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MS ISO 24510:2024 Activities relating to drinking water and wastewater services — Guidelines for the assessment and for the improvement of the service to users.

Mushiirah — Sat, 26 Sep 2026 09:24:05 +0000

Scope:

This document 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 these are being met.
The following are within the scope of this document:
— 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;
— assessment criteria for service to users;
— introduction to performance indicators;
— examples of performance indicators.
The following are outside the scope of this document:
— methods of design and construction of drinking water and wastewater systems;
— the regulating management structure and methodology of operation and management of activities relating to drinking water and wastewater services, including contracting;
— topics relating to the system inside buildings.

General Information
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Standard number	MS ISO 24510:2024
Title and Sub-titles	Activities relating to drinking water and wastewater services — Guidelines for the assessment and for the improvement of the service to users.
Status	Current
Replaces	MS ISO 24510:2007
Replaced by
Edition	Second
Technical Committee	MSB/TC 11 - Environmental Management
ICS	03.080.30; 13.060.20; 13.060.30
Publication date	2025/05/24
Corrected version
Government Notice No.	General Notice No. 803 of 2025
Number of Pages	49
Amendments/ Corrigendums
Availability	Yes
Note

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MS ISO 4064-5:2025 Water meters for cold potable water and hot water — Part 5: Installation requirements

Mushiirah — Sat, 12 Sep 2026 10:02:46 +0000

Scope:

This document applies to water meters used to meter the volume of cold potable water and hot water flowing through a fully charged, closed conduit. These water meters incorporate devices which indicate the integrated volume. This document specifies criteria for the selection of single, combination and concentric water meters, associated fittings, installation, special requirements for meters, and the first operation of new or repaired meters to ensure accurate constant measurement and reliable reading of the meter.

In addition to meters based on mechanical principles, this document also applies to water meters based on electrical or electronic principles, and to water meters based on mechanical principles incorporating electronic devices, used to measure the volume of cold potable water and hot water.

It also applies to electronic ancillary devices. Ancillary devices are optional. However, national or international regulations may make some ancillary devices mandatory in relation to the utilization of the water meter.

The recommendations of this document apply to water meters, irrespective of technology, defined as integrating measuring instruments determining the volume of water flowing through them.

NOTE Any national regulations apply in the country of use.

General Information
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Standard number	MS ISO 4064-5:2025
Title and Sub-titles	Water meters for cold potable water and hot water — Part 5: Installation requirements
Status	Current
Replaces	MS ISO 4064-5:2014
Replaced by
Edition	Second
Technical Committee	MSB/TC 11 - Environmental Management
ICS	91.140.60
Publication date	2025/12/20
Corrected version
Government Notice No.	General Notice No. 1782 of 2025
Number of Pages	12
Amendments/ Corrigendums
Availability	Yes
Note

MS ISO 24566-4:2025 Drinking water, wastewater and stormwater systems and services — Adaptation of water services to climate change impacts — Part 4: Wastewater services

Mushiirah — Sat, 12 Sep 2026 09:38:04 +0000

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.

General Information
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Standard number	MS ISO 24566-4:2025
Title and Sub-titles	Drinking water, wastewater and stormwater systems and services — Adaptation of water services to climate change impacts — Part 4: Wastewater services
Status	Current
Replaces
Replaced by
Edition	First
Technical Committee	MSB/TC 11 - Environmental Management
ICS	03.080.30; 13.020.30; 13.060.20
Publication date	2026/04/25
Corrected version
Government Notice No.	General notice No 434 of 2026
Number of Pages	40
Amendments/ Corrigendums
Availability	Yes
Note

MS ISO 21939-2:2023 Method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse — Part 2: Accounting for energy recovery

Mushiirah — Sat, 12 Sep 2026 09:20:17 +0000

Scope:

This document sets out the general principles for, and provides guidance on, the quantitative characterization of energy recovery from wastewater and sludge treatment, and how to account for this in the total energy consumption calculation.

The scope of this document includes:

— a definition of the main energy recovery processes applicable to industrial wastewater treatment and sludge treatment for reuse, such as anaerobic digestion yielding biogas;

— an introduction to the possible forms of energy generated by energy recovery processes and systems, such as electricity, steam or heat, and how to account for intentional wasting or commercial utilization of biogas;

— guidance on the value to be taken into account as quantification of the energy generated, including the power actually generated on average;

— a limit level for contaminated components in biogas allowed before any utilization;

— principles to integrate the energy recovery results with the energy consumption in accordance with ISO 21939-1.

Energy production which is not recovered from wastewater or sludge treatment processes is not within the scope of this document and is not included in the calculations and results expressed in it.

General Information
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Standard number	MS ISO 21939-2:2023
Title and Sub-titles	Method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse — Part 2: Accounting for energy recovery
Status	Current
Replaces
Replaced by
Edition	First
Technical Committee	MSB/TC 11 - Environmental Management
ICS	13.060.01; 13.060.30
Publication date	2026/04/25
Corrected version
Government Notice No.	General notice No 434 of 2026
Number of Pages	12
Amendments/ Corrigendums
Availability	Yes
Note

MS ISO 24566-3:2025 Drinking water, wastewater and stormwater systems and services — Adaptation of water services to climate change impacts — Part 3: Drinking water services

Mushiirah — Sat, 12 Sep 2026 07:54:47 +0000

Scope:

This document provides guidance and requirements for identifying and assessing impacts of climate change on drinking water systems and for 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 drinking water 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.

General Information
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Standard number	MS ISO 24566-3:2025
Title and Sub-titles	Drinking water, wastewater and stormwater systems and services — Adaptation of water services to climate change impacts — Part 3: Drinking water services
Status	Current
Replaces
Replaced by
Edition	First
Technical Committee	MSB/TC 11 - Environmental Management
ICS	03.080.30; 13.020.30; 13.060.20
Publication date	2026/04/25
Corrected version
Government Notice No.	General notice No 434 of 2026
Number of Pages	38
Amendments/ Corrigendums
Availability	Yes
Note

MS ISO 24521:2025 Drinking water, wastewater and stormwater systems and services — Management of on-site domestic wastewater services

Mushiirah — Sat, 12 Sep 2026 07:40:36 +0000

Scope:

This document provides guidance and requirements for the management of on-site domestic wastewater systems and services, using appropriate technologies in their entirety at any level of development.

This document supplements and is intended to be used in conjunction with ISO 24511 and ISO 24525. It includes guidance and requirements for the following:

— management of on-site domestic wastewater systems and services from the operator’s perspective, including maintenance techniques, training of personnel and risk considerations;

— management of on-site domestic wastewater systems (ODWS) from the perspective of owners and users; — design and construction of ODWS;

— planning, operation and maintenance, and health and safety issues. This document is applicable to both publicly and privately operated on-site domestic wastewater (black and grey water) services, for one or more dwellings.

In rural areas and areas under development, management is sometimes provided by the owners of the premises where wastewater is generated. In this document the term “services” includes “self-services” provided by the owners of the premises.

The following are outside the scope of this document:

— limits of effluent quality for wastewater discharged into the environment;

— analytical methods;

— stormwater runoff;

— content of contracts or subcontracts.

This document provides guidance and requirements for the management of on-site domestic wastewater systems and services, using appropriate technologies in their entirety at any level of development.

This document supplements and is intended to be used in conjunction with ISO 24511 and ISO 24525. It includes guidance and requirements for the following:

— management of on-site domestic wastewater systems and services from the operator’s perspective, including maintenance techniques, training of personnel and risk considerations;

— management of on-site domestic wastewater systems (ODWS) from the perspective of owners and users;

— design and construction of ODWS;

— planning, operation and maintenance, and health and safety issues.

This document is applicable to both publicly and privately operated on-site domestic wastewater (black and grey water) services, for one or more dwellings. In rural areas and areas under development, management is sometimes provided by the owners of the premises where wastewater is generated.

In this document the term “services” includes “self-services” provided by the owners of the premises.

The following are outside the scope of this document:

— limits of effluent quality for wastewater discharged into the environment;

— analytical methods;

— stormwater runoff;

— content of contracts or subcontracts.

General Information
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Standard number	MS ISO 24521:2025
Title and Sub-titles	Drinking water, wastewater and stormwater systems and services — Management of on-site domestic wastewater services
Status	Current
Replaces	MS ISO 24521:2016
Replaced by
Edition	Second
Technical Committee	MSB/TC 11 - Environmental Management
ICS	03.080.30; 13.030.20; 13.060.30
Publication date	2026/04/25
Corrected version
Government Notice No.	General notice No 434 of 2026
Number of Pages	38
Amendments/ Corrigendums
Availability	Yes
Note

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MS ISO 21939-1:2019 A method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse — Part 1: Biological processes

Mushiirah — Sat, 12 Sep 2026 07:24:39 +0000

Scope:

This document sets out the general principles for, and provides guidance on, the quantitative characterization of the energy consumed by industrial biological wastewater treatment systems. It does not aim to characterize the treatment pollutants removal performance or process reliability or any other consideration in the selection of a wastewater treatment system.

This document includes the following sub-systems of biological treatment system:

— Biological reactors, which might be suspended growth or fixed film processes or a combination thereof, and can include anaerobic, anoxic and/or aerobic tanks and/or zones.

— Solid-liquid separation processes such as sedimentation, flotation, or membrane filtration, used for clarification of the water before discharge to downstream processes, which can also involve the return of the separated solids as sludge back to the biological reactor.

— Any pumps, blowers and mixers for water circulation, mixing and air supply in and between the sub-systems listed herein.

— Heating or cooling of the water for treatment. This document does not include the following subsystems of the biological treatment system:

— Wastewater feed pumps.

— Pre-treatment systems, which for the purposes of this document also include preliminary and primary treatment processes, such as but not limited to, screening, sedimentation, dissolved air flotation, chemical oxidation, oil separation.

— Post-treatment processes, such as but not limited to, disinfection, desalination, ion exchange, sludge treatment and handling systems.

— Site lighting or any energy consumption involved in office operation.

— Energy recovery from processes such as anaerobic reactors producing biogas.

Filtration processes, which are sometimes part of the biological treatment process and at other times part of the post treatment, are referred to separately within this document.

General Information
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Standard number	MS ISO 21939-1:2019
Title and Sub-titles	A method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse — Part 1: Biological processes
Status	Current
Replaces
Replaced by
Edition	First
Technical Committee	MSB/TC 11 - Environmental Management
ICS	13.060.01; 13.060.30
Publication date	2026/04/25
Corrected version
Government Notice No.	General notice No 434 of 2026
Number of Pages	12
Amendments/ Corrigendums
Availability	Yes
Note

MS ISO 4789:2023 Guidelines for wastewater treatment and reuse in thermal power plants

Mushiirah — Sat, 12 Sep 2026 07:05:50 +0000

Scope:

This document specifies guidelines for wastewater treatment and reuse in thermal power plants, including the types and characteristics of wastewater and the technologies of wastewater treatment and reuse. In this document, thermal power plant drainage systems are divided into fuel supply, chemical water treatment, boiler and auxiliary, recirculating cooling, flue gas processing, gasification scrubber and ash handling. Wastewater from these systems is classified in accordance with its system sources. In addition, technical guidelines for wastewater treatment and reuse are provided according to the water requirements of systems in the thermal power plant. This document is formulated to provide feasible technical guidance for the treatment and reuse of wastewater in thermal power plants. It is applicable to coal-fired, oil-fired, gas-fired (including gas turbine), biomass-fired, waste incineration and integrated gasification combined cycle (IGCC) thermal power plants.

General Information
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Standard number	MS ISO 4789:2023
Title and Sub-titles	Guidelines for wastewater treatment and reuse in thermal power plants
Status	Current
Replaces
Replaced by
Edition	First
Technical Committee	MSB/TC 11 - Environmental Management
ICS	13.030.20; 13.030.50; 13.060.25
Publication date	2026/04/25
Corrected version
Government Notice No.	General notice No 434 of 2026
Number of Pages	29
Amendments/ Corrigendums
Availability	Yes
Note