Tokyo Olympics water survey shows mixed results on E.coli levels

FILE PHOTO: Visitors stroll at Odaiba Marine Park, the venue for Marathon Swimming and Triathlon events during the Tokyo 2020 Games, in Tokyo, Japan October 4, 2017. REUTERS/Issei Kato

TOKYO (Reuters) - A survey of the water in Tokyo bay, where the swimming leg of the triathlon will be held in the 2020 Olympics, produced mixed results, with excess levels of E.coli bacteria recorded on one day, even in areas protected by underwater screens, the organisers said on Friday.

The jump was likely caused by heavy rain, they said. As in many other major cities around the world, Tokyo processes rainwater and household wastewater via the same sewage system.