British Standards Institution

Sector: Construction

Overview: Under the direction of B/505 is responsible for the UK input into CEN/TC 165/WG 50 and ISO/TC 282 and the preparation and maintenance of function standards for the design, calculation, construction, commissioning, operation and maintenance of systems for the reuse of recyclable water within buildings or curtilages; also, where there is no material- specific technical committee involved, associated product standards.

Committee standards activity

In Progress (36)

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Reference	Standards description	Status ? The standards development process is divided into chronological stages: Proposal; Drafting; Public comment; Comment resolution; Approval; Published standard.
PD ISO/TR 25262	High quality reuse of gray water Categories: Unclassified documents Drafting begins : 2025-08-22	Drafting
ISO/TC 282/SC 4 N 249, ISO/NP 4789	Guidelines for wastewater treatment and reuse in thermal power plants Categories: Information management \| Vocabularies \| Environment. Health protection. Safety \| Standardization. General rules \| Environment \| Wastes \| Waste. Equipment and installations. Disposal and treatment. \| Water quality Proposal begins : 2020-01-09	Proposal
ISO/TC 282/SC 4 N 217	A method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse -- Part 2: Part 2 -- Accounting for energy recovery Categories: Environment \| Environmental protection \| Wastes \| Wastes. Liquid \| Recycling \| Wastes. Other \| Water quality \| Water. Industrial use \| Water. Examination. Physical properties \| Construction \| Civil engineering \| External water conveyance systems Proposal begins : 2019-07-09	Proposal
ISO/TC 282/SC 2 N 297, ISO/NP 9111	Water reuse in urban areas -- Guideline for benefit evaluation of reclaimed water use Categories: Information management \| Standardization. General rules \| Environment \| Water quality \| Water quality. General \| Water. Examination. General \| Water quality. Other Proposal begins : 2021-07-15	Proposal
ISO/PWI 23623.2	Guidelines for operation and maintenance of treatment and reuse system of leachate from municipal solid waste (MSW) incineration plants Categories: Information management \| Standardization. General rules \| Environment \| Wastes. Liquid \| Waste. Equipment and installations. Disposal and treatment. \| Water quality \| Water. Industrial use Proposal begins : 2023-12-01	Proposal
ISO/NP TS 25830 -	Guidelines for treatment of high-salinity wastewater generated during the water reuse process in thermal power plants Categories: Information management \| Standardization. General rules Proposal begins : 2025-03-24	Proposal
ISO/NP TS 25445	Specification for the reuse of water from permeable pavement Categories: Information management \| Standardization. General rules Proposal begins : 2024-10-01	Proposal
ISO/NP 9784 -	Guidelines for deep purification of secondary effluent for non-potable reuse using biological filtration systems Categories: Standardization. General rules \| Environment \| Water quality \| Water quality. General \| Water. Examination. General \| Water. Examination. Biological properties Proposal begins : 2021-08-08	Proposal
ISO/NP 26098	Water reuse-Guideline for Water Balance Analysis Categories: Information management \| Standardization. General rules Proposal begins : 2025-07-30	Proposal
ISO/NP 25809	Guidelines for treatment and reclamation processes for toxicity reduction of industrial wastewater Categories: Information management \| Standardization. General rules Proposal begins : 2025-07-23	Proposal

Published (37)

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Reference	Standards description	Status ? The standards development process is divided into chronological stages: Proposal; Drafting; Public comment; Comment resolution; Approval; Published standard.
PD ISO/TS 21152:2024	Guidance on water conservation techniques of circulating cooling water in thermal power plants Categories: Water. Industrial use \| Power stations Published standard begins : 2024-12-17	Published standard
BS ISO 9784:2024	Guidelines for biological filtration of secondary effluent for water reuse Categories: Water quality. General Published standard begins : 2024-11-05	Published standard
BS ISO 9111:2024	Water reuse in urban areas. Guidelines for benefit evaluation of reclaimed water use Categories: Water quality. General Published standard begins : 2024-06-27	Published standard
BS ISO 4789:2023	Guidelines for wastewater treatment and reuse in thermal power plants Categories: Wastes. Liquid \| Recycling \| Water. Industrial use Published standard begins : 2023-06-13	Published standard
BS ISO 24575:2023	General principles and guidelines for cost analysis in planning of decentralized wastewater treatment and/or reuse Categories: Water quality. General Published standard begins : 2023-06-08	Published standard
BS ISO 24416:2022	Water reuse in urban areas. Guidelines for water reuse safety evaluation. Stability evaluation of reclaimed water Categories: Water quality. General Published standard begins : 2022-08-03	Published standard
BS ISO 24297:2022	Guidelines for treatment and reuse of leachate from municipal solid waste (MSW) incineration plants Categories: Water quality. General Published standard begins : 2022-08-20	Published standard
BS ISO 23070:2020	Water Reuse in Urban Areas. Guidelines for reclaimed water treatment: Design principles of a RO treatment system of municipal wastewater Categories: Water quality. General Published standard begins : 2020-12-16	Published standard
BS ISO 23056:2020	Water reuse in urban areas. Guidelines for decentralized/onsite water reuse system. Design principles of a decentralized/onsite system Categories: Water quality. General Published standard begins : 2020-09-24	Published standard
BS ISO 23044:2020	Guidelines for softening and desalination of industrial wastewater for reuse Categories: Wastes. Liquid \| Waste. Equipment and installations. Disposal and treatment. Published standard begins : 2020-07-22	Published standard

Withdrawn (10)

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Reference	Standards description	Status ? The standards development process is divided into chronological stages: Proposal; Drafting; Public comment; Comment resolution; Approval; Published standard.
BS ISO 22519:2019	Purified water and water for injection pretreatment and production systems Categories: Water quality. General Withdrawn begins : 2023-04-13	Withdrawn
BS ISO 20670:2018	Water reuse. Vocabulary Categories: Environment. Health protection. Safety \| Water quality. General Withdrawn begins : 2023-11-24	Withdrawn
BS ISO 16075-4:2016	Guidelines for treated wastewater use for irrigation projects. Monitoring Categories: Water quality. General \| Water. Sewage Withdrawn begins : 2021-06-01	Withdrawn
BS ISO 16075-3:2015	Guidelines for treated wastewater use for irrigation projects. Components of a reuse project for irrigation Categories: Water quality. General \| Water. Sewage Withdrawn begins : 2021-06-01	Withdrawn
BS ISO 16075-2:2015	Guidelines for treated wastewater use for irrigation projects. Development of the project Categories: Water quality. General \| Water. Sewage Withdrawn begins : 2020-12-08	Withdrawn
BS ISO 16075-1:2015	Guidelines for treated wastewater use for irrigation projects. The basis of a reuse project for irrigation Categories: Water quality. General \| Water. Sewage Withdrawn begins : 2020-12-02	Withdrawn
BS EN 16941-1:2018	On-site non-potable water systems. Systems for the use of rainwater Categories: External water conveyance systems Withdrawn begins : 2024-03-22	Withdrawn
BS 8525-1:2010	Greywater systems. Code of practice Categories: Fluid storage devices. Other \| Drainage Withdrawn begins : 2025-01-28	Withdrawn
BS 8515:2009+A1:2013	Rainwater harvesting systems. Code of practice Categories: Fluid storage devices. Other \| Drainage Withdrawn begins : 2018-07-19	Withdrawn
BS 8515:2009	Rainwater harvesting systems. Code of practice Categories: Fluid storage devices. Other \| Drainage Withdrawn begins : 2013-12-16	Withdrawn

Message Committee Become a committee member

Committee members

Nominating organizations

Associate Committee Manager
Bathroom Manufacturers Association
BSI Standards Publishing Manager
Changed from 'UK Rainwater Management Association' 23/01/2020
Chartered Institution of Water and Environmental Management
Committee Manager
Future Water Association
I R C S A - International Rainwater Catchment Systems Association
N H B C - National House-Building Council
Principal Expert - Treatment Plants
UK Rainwater Management Association
Water Science Forum
Water UK

Liaisons with other committees

Individual capacity - Storm Water Expert
Liaison - CB/503
Liaison - EH/3

BSI roles

Committee Chair

Standards Development

B/505/50 - Water reuse

Committee standards activity