algae and vegetation in canals carrying wastewater (i.e. eutrophication); groundwater quality degradation by the various reclaimed water contaminants, migrating and accumulating in the soil and aquifers. Guidelines and regulations International organizations World Health Organization (WHO): "Guidelines for the safe use of wastewater, excreta and greywater" (2006). United Nations Environment Programme (UNEP): "Guidelines for municipal wastewater reuse in the Mediterranean region" (2005). United Nations Water Decade Programme on Capacity Development (UNW-DPC): Proceedings on the UNWater project "Safe use of wastewater in agriculture" (2013). European Union Since May 25, 2020, there is an EU regulation on minimum requirements for water reuse for irrigation purposes. It shall apply from June 26, 2023. The water quality requirements are divided into four categories depending on what is irrigated and how the irrigation is performed. The water quality parameters included are E.coli, BOD5, Total suspended solids (TSS), turbidity, legionella, and intestinal nematodes (helminth eggs). In the Water Framework Directive, reuse of water is mentioned as one of the possible measures to achieve the Directive's quality goals, however this remains a relatively vague recommendation rather than a requirement: Part B of Annex VI refers to reuse as one of the "supplementary measures which Member States within each river basin district may choose to adopt as part of the programme of measures required under Article 11(4)". Besides that, Article 12 of the Urban Wastewater Treatment Directive concerning the reuse of treated wastewater states that "treated wastewater shall be reused whenever appropriate", is not specific enough to promote water reuse and it leaves too much room for interpretation as to what can be considered as an "appropriate" situation to reuse treated wastewater. Despite the lack of common water reuse criteria at the EU level, several Member States (MS) have issued their own legislative frameworks, regulations, or guidelines for different water reuse applications (e.g. Cyprus, France, Greece, Italy, and Spain). However, after an evaluation carried out by the European Commission (EC) on the water reuse standards of several member states it was concluded that they differ in their approach. There are important divergences among the different standards regarding the permitted uses, the parameters to be monitored, and the limit values allowed. This lack of harmonization among water reuse standards might create some trade barriers for agricultural goods irrigated with reclaimed water. Once on the common market, the level of safety in the producing member states may be not considered as