Why do beaches get bacteria?

Polluted runoff (water that drains after rainfall) and untreated sewage released into the water can expose swimmers to harmful microorganisms called “pathogens.” These pathogens can be present at or near the site where polluted discharges enter the water.



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Some cities also have joint sewer and stormwater systems that can overflow—this leads to “a mixture of raw, untreated sewage and stormwater” that can sometimes flow onto recreational beaches, said Rumpler. Runoff water from large farms can sometimes also contaminate beaches, he added, as can feces from wildlife.

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Many beaches may be contaminated with fecal bacteria, which can lead to gastrointestinal issues. Avoid swimming after it rains and wash your hands regularly to cut down on your chances of getting sick at the beach. Check with your local health department to determine if your beach is safe for swimming.

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You are more likely to get sick if you swim at a closed beach or one that has not been tested for contamination. Swimmers can sometimes be exposed to more serious diseases like salmonella. People can get rashes simply from getting polluted water on their skin or in their eyes.

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You are more likely to get sick if you swim at a closed beach or one that has not been tested for contamination. Swimmers can sometimes be exposed to more serious diseases like salmonella. People can get rashes simply from getting polluted water on their skin or in their eyes.

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The two most common reasons for beach closures are elevated concentrations of E. coli and/or cyanobacteria (blue-green algae) blooms. Below, we specifically discuss E. coli and what it means for our lakes and beaches.

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Some two-thirds of Great Lakes beaches that were tested had at least one unsafe day, according to the Environment America report. In Ohio and Pennsylvania, which border Lake Erie, all but three of the tested beaches had at least one unsafe day last year.

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According to a damning new report from Environment America, over half of all U.S. beaches are contaminated with poop. Yep, you read that right. Pollution, overdevelopment, and unsanitary conditions have given many beaches a filthy reputation, making swimming in the water potentially unsafe.

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Beach sand has been found to contain eggs and/or larvae of the human and zoonotic parasites Toxocara spp. (roundworm), Ancylostoma spp. (hookworm) and Trichuris spp.

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