Around 2,000 people took part in the events in Sunderland, northeast England, last weekend, which included swimming off the city's Roker beach.
Routine tests carried out by the Environment Agency at Roker in late July, days before the competition, found high levels of E. coli bacteria in the water. "The swim should have been cancelled," he added, posting a picture of a graph with the results of the water tests from Roker. Local water company Northumbrian Water insisted there have been no discharges "that might negatively impact water quality" at Roker since 2021.
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