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The best way to stay safe is to heed all E. coli warnings and avoid swimming in lakes that have been identified as being contaminated with the bacteria.
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However, even if there are no warning signs, be aware that E. coli levels can change rapidly, and you may want to avoid swimming in a lake that has had a history of E. coli outbreaks, especially after major rain events.
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Other signs of E. coli in lakes may include foaming, considerable amounts of scum on the surface of the water, and a strong odor. If you see any of these signs in a lake, it is best to avoid swimming altogether.
