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- Drinking water quality and potential risks related to the presence of biofilms in water taps of Portuguese SchoolsPublication . Quintela, Sara; Freitas, Marisa; Vieira Da Silva, ManuelaIn drinking water distribution systems the surfaces of taps are in contact with non-sterile water, which can lead to biofilm development. Biofilms can harbor opportunistic pathogens, representing a potential risk factor of water-related diseases, especially to sensitive human subgroups such as children. This study aimed to assess the microbial quality of water and the biofilm presence on inner surfaces of taps and flow straighteners.