This European Standard specifies the principles of design, sizing, installation, identification, commissioning and maintenance of greywater systems with the purpose of use of greywater on-site. It applies preferably for the use of treated greywater for: WC flushing; garden watering; laundry; cleaning purposes. This European Standard also specifies the minimum requirements for greywater systems. Excluded from the scope of this European Standard are: the use as drinking water and for food preparation; the use for personal hygiene purposes; direct reuse systems for external use e. g. garden watering; product design for specific system components; industrial effluents; heat recovery and cooling demands. NOTE Conformity with this European Standard does not exempt from compliance with the obligations arising from local or national regulations.