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  • ISO
    ISO 24521:2025 Drinking water, wastewater and stormwater systems and services - Management of on-site domestic wastewater services
    Edition: 2025
    $460.92
    / user per year

Content Description

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.



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About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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