Concerns over E. coli contamination in various waterways have intensified, particularly highlighted by the withdrawal of Belgium's Olympic triathlon team after an athlete fell ill following swimming in the Seine, which has been subject to heavy rainfall and sewage overflow. The Seine, despite a $1.5 billion renovation to make it swimmable, is still plagued by high E. coli levels, raising questions about water safety for athletes and the public. Similar issues are reported in the UK, where the River Nidd and Totnes' Steamer Quay have shown dangerously high E. coli levels, leading to poor water quality ratings, prompting local groups to advocate for better sewage management. Yorkshire Water has initiated a £180m program to address these discharges, but campaigners argue that more citizen involvement is necessary for real change. Experts warn that swimming in contaminated waters poses serious health risks, including E. coli infections, which can lead to severe illness, particularly for vulnerable populations. The situation underscores the urgent need for effective water pollution management to protect public health and the environment.