Olympic Marathon Swim Test Run Is Canceled Over Water Quality Concerns for Seine River

Ducks swim along the Seine River in front of the Eiffel Tower during the 2024 Summer Olympics, Monday, July 29, 2024, in Paris. As the Olympics continue in Paris, the Seine River's water quality remains a major area of concern for officials. Organizers of the triathlon event cancelled swimming practice on Monday for the second day in a row because of poor water quality. Event organizers hope sunny weather will make swimming viable on Tuesday when the triathlon begins. AP Photo/David Goldman

PARIS—A test run meant to allow Olympic athletes to familiarize themselves with the marathon swimming course in the Seine River was canceled Tuesday over concerns about water quality in the Paris waterway.

World Aquatics made the decision to cancel the exercise at an early morning meeting, the organization said in a statement. Fluctuating bacteria levels in the long-polluted waterway have been a constant concern throughout the Games with the swimming portion of the triathlon and the marathon swimming events both planned in the river.