3 weeks before 2024 Paris Olympics, Seine River's E. coli levels pose a threat to marathon swimming and triathlon events due to persistent rainfall causing sewer system contamination.

3 weeks before the 2024 Paris Olympics, the Seine River has unsafe levels of E. coli, posing a threat to marathon swimming and triathlon events scheduled in the river. Persistent rainfall has worsened the issue, causing fecal bacteria to infiltrate the sewer system and discharge into the river. Despite the high contamination levels, organizers remain optimistic and hope for improved summer weather to help resolve the issue by the second half of July.