The Olympic triathlon events in Paris have been significantly impacted by water quality concerns in the Seine River following heavy rain. While the women's triathlon proceeded as planned after initial delays, the men's event was postponed from Tuesday to Wednesday due to pollution concerns. Paris authorities have invested €1.4 billion in infrastructure to clean the river, including building large water storage basins. Despite these efforts, tests revealed high levels of bacteria like E. coli after recent downpours, forcing cancellations of training sessions and raising doubts about the river's suitability for upcoming events. Paris Mayor Anne Hidalgo and other officials have made public gestures to assure the water's safety, but the situation remains precarious.