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This document provides guidance on 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 Assessment Principles. 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.

This document provides guidance on 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 Assessment Principle. 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.

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.