High levels of E.coli bacteria have been found in the River Thames section designated for the Henley Royal Regatta, with readings surpassing safety limits. Citizen scientists and Thames Water conducted tests, providing contrasting results and attributing the pollution to factors like sewage discharges and rainfall. Concerns over health risks to rowers and spectators have led to the issuance of safety guidelines by various organizations involved in the event, emphasizing precautions to avoid infection. The situation underscores the ongoing debate on river health management and the need for coordinated efforts to address pollution sources, particularly from sewage and environmental factors.