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The use of seawater in public swimming pools could offer a more sustainable solution considering the challenges posed by climate change faced across Europe and the scarcity of potable water. However, the sector of swimming pools currently lacks a unified European legislative framework and faces significant fragmentation, particularly regarding seawater use. This paper examines the existing regulatory landscape concerning seawater utilization in public swimming pools across 23 European coastal countries, providing an overview of the situation and outlining permitted disinfection methods. It also addresses the chaotic state of standardized physicochemical and microbiological parameters, as well as quality limits imposed on disinfection by-products in pool water and their toxicity. The findings underscore the urgent need for legislative updates and highlight the potential for developing relevant European regulations to standardize practices within the sector, to better manage sustainability and public health in aquatic environments.