ISO 24521:2025

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.