Olympics 2024: Triathlon officials 'confident' for Wednesday

"At this point, we are disappointed because we cannot follow what was planned, but we are all in a good mood thinking that we will have the opportunity [to hold the race]," World Triathlon CEO Marisol Casad said. "We are quite confident the race will happen tomorrow."

The federation's confidence comes despite an expected rainfall for Tuesday night, just hours before the race. Merle confirmed that the rainfall during the opening ceremony was the main reason the Seine was not within the federation's threshold for pollution levels.

"The whole world has seen that it rained heavily over the course of the opening ceremony ... and also the morning after. The equivalent of July rainfall fell in just 36 hours, which is about 25mm. That is a lot," Merle said.

A decision on whether Wednesday's triathlon races will go ahead will be made at 3:30 a.m. local time, which will take into account the results from Tuesday's morning's water sample as well as a range of other factors.

If the water quality is not deemed appropriate, they will intend to run the race on Friday, which could then see officials drop the swimming leg and pivot to a duathlon should safety concerns still not be satisfied.

When asked why they remain so confident of holding the races on Wednesday, Merle said: "Obviously we are confident because we have seen in the month of July that even when it rained it has been absorbed quickly by the river so that the river would have the threshold acceptable for the international federation.

"That's why we're confident because we have seen these evolutions [previous data points] and that all the infrastructure we have built could work."

Paris 2024 has a backup plan to move the marathon swim event should the Seine not be suitable to stage it. However, no backup plan was made for the triathlon events.

"We worked very closely with World Triathlon when it came to contingency plans," Merle said. "The difference with marathon swimming is that either you swim or you cancel the race, while in the triathlon you still have the opportunity as a last resort to move to a duathlon."