ISO DIS 24521

Description / Abstract: The guidelines contained in this International Standard are applicable to publicly and privately operated sanitary basic on-site domestic wastewater (black and grey water) services, for one or more dwellings but do not favour any particular operational model.

NOTE 1 Management of on-site domestic wastewater, especially in rural areas / areas under development is sometimes provided by the owners of the premises where wastewater is generated. In such cases the owners of the premises execute the management of domestic wastewater by themselves. Therefore, the term "services" in this International Standard includes also "self-services" of the owners of the premises.

NOTE 2 Especially in undeveloped areas, domestic wastewater is collected in an undiluted form (i.e. sanitary waste). Sources of sanitary waste / wastewater in this International Standard are residential, excluding storm water runoff.

NOTE 3 This International Standard is intended to be used in conjunction with ISO 24511.

NOTE 4 Annex B shows schematics of basic on-site domestic wastewater systems. The aim of the standard is not to give all variations but illustrate several examples.

This International Standard provides guidance for the management of basic on-site domestic wastewater services using technologies in their entirety at any level of development, as applicable.

This International Standard supplements ISO 24511, as applicable. This International Standard includes:

- 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 users' perspective;

-advice for design and construction of basic on-site domestic wastewater systems (see annex B);

-guidelines for the education of the user and operator of basic on-site domestic wastewater systems.

The following are outside the scope of this International Standard:

-limits of acceptability for wastewater discharged into a receiving body213 ;

-analytical methods;

-regulation of the management structure of sanitary waste / wastewater service activities of operation and management;

-regulation of the content of contracts or subcontracts.