Souss-Massa watershed is suffering more and more from hydraulic deficit and the use of treated wastewater represents an alternative for water conservation, and sustainable economic growth of the region. The Agadir region is known for its agriculture and its tourist attraction, which puts a lot of pressure on water resources, and at the same time the potential of treated wastewater is around 50 million m3/year. The use of municipal wastewater (treated and untreated) in agriculture is becoming a routine practice in many (semi-) arid countries of the world. Wastewater and its nutrient content can be used extensively for irrigation and other ecosystem services, cutting on groundwater and freshwater consumption. Wastewater also offers environmental and socioeconomic benefits such as reduction in effluent disposal problems, supply of nutrients as fertilizer, and improvement in crop production during the dry season. Its reuse can deliver positive benefits (save freshwater, save fertilizer, and prevent pollution) to the farming community, society, and municipalities. Despite these advantages, wastewater applicability for irrigation depends on its physical, chemical, and microbiological quality. In fact, a continuous use of wastewater may cause serious health problems for humans and animals because of the possible heavy metal content. Therefore, it is of paramount importance to continue thorough investigations to evaluate the effects of wastewater irrigation on crops, grasses, soil, and environment before recommending it for long-term use.

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