This study presents the drinking water supply system quality analysis in the context of the presence and distribution of eukaryotic assemblage, specifically the presence of algae in 10 specific sites (water treatment plants and fountains) from the Danube Delta. The analysis comes with a new approach based on stakeholders involvement and understanding of the new emerging problems generated by the presence of algae in the water supply system. In order to upgrade the water quality it is needed an

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... mprovement on the management of the water supply systems, with direct connection to the management of presence of algae or the occurrences of algal toxins in drinking water sources. Taking into consideration that Romania have no regulation dealing with the occurrence or the presence of algae or algal toxins in recreational or drinking water sources, it is important for all the stakeholders (local communities, local authorities, regional and national authorities etc.) to be informed about the the possibility of their occurrence in drinking or recreational waters, by creating a virtual space where they have access to the researches in this area.