“Implementable” guidelines. Reuse operations imply the application of risk man- agement strategies with the promotion of appropriate treatment options and the development of guidelines and mechanisms meant to decrease the risks associated. Health risks include microbiological and chemical risks. Water reuse regulations are directed primarily at health protection and address as well environment protection. Wastewater quality guidelines or standards vary with the type of reuse application. They should reflect the potential for regional variations in climate, water flow and wastewater characteristics and should be designed to protect individuals against realistic maximum expo- sures. In practice, these factors are expressed through different water quality requirements, as well as treatment process requirements and criteria for opera- tion and reliability. They should be (1) realistic in relation to local conditions (epidemiological, socio-cultural and environmental factors), (2) affordable, and (3) enforceable. For the sake of integrated water resources management and to gain public understanding and acceptance, water reuse regulations should be part of a set of consistent water regulations applying to drinking water, bathing water, irrigation water, discharge, etc. (Bahri and Brissaud, 2002).