The issue of greywater management which is defined as all sources of domestic wastewater excluding toilet wastewater is gaining more and more importance, especially in developing countries where improper wastewater management is one of the most important causes for environmental pollution and fatal diseases. The main problem for suitable greywater management systems on the residence level is the lack of knowledge and experience in that field, especially in developing countries. The report presents typical greywater characteristics, the main treatment systems applied around the world, and existing regulations for greywater treatment and reuse. Case studies are presented where greywater treatment systems are successfully applied.