Majority of swimming pools contain fecal matter, E. coli, study says

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A majority of public pools tested the Centers for Disease Control tested last summer tested positive for E. coli bacteria, the Centers for Disease Control says, and the cause is likely rooted in swimmers introducing fecal matter to the water.

According to LiveScience, the fecal matter that is typically found in swimming pools gets in in two ways: by swimmers not showering before getting into the water and by people defecating in the pool itself.

The CDC says that an average person has about 0.14 grams of fecal matter on their skin that could find its way into a pool if a person doesn't shower before getting in.