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Over 30 Massachusetts Beaches Shut Due to Health Risk Bacteria Levels Surge After Heavy Rainfall

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Published on July 11, 2025
Over 30 Massachusetts Beaches Shut Due to Health Risk Bacteria Levels Surge After Heavy RainfallSource: Unsplash/ Samantha Fortney

Residents looking to beat the heat at local Massachusetts beaches this weekend might need to reconsider their plans. According to Boston 25 News, over thirty beaches across the state have been closed due to high bacteria levels, posing health risks to would-be swimmers.

The Massachusetts Department of Public Health, utilizing an interactive dashboard that monitors beach water quality, reported closures at 35 beaches as of Friday afternoon. Although many of these bodies of water are out of bounds due to harmful bacteria levels, some, like the main beach at Walden Pond in Concord, remain closed for other reasons, including construction work.

This water quality data is critical in informing the public about conditions at their local swimming spots. Unsafe water can lead to gastrointestinal and respiratory issues, among other health problems, making these closures a precaution to protect public health. The state carries out water testing from Memorial Day through Labor Day, ensuring that any change in conditions is quickly identified and communicated to the public.

Following Thursday's significant rainfall, which drenched several parts of Massachusetts, the risk of bacterial contamination has spiked. A statement from CBS News Boston described the deluge as a "1 in 200 year event," leading to stormwater runoff or sewage overflows that are likely responsible for the high levels of bacteria. These beach closures include popular locations such as Tenean Beach in Boston, closed due to rainfall, and others scattered from Ashby to Winthrop, experiencing bacterial exceedances.

Health officials warn that exposure to bacteria-contaminated waters can cause gastrointestinal and respiratory illnesses, as well as skin rashes and itching. With the weekend approaching, residents planning to visit Massachusetts beaches are strongly advised to consult the state’s interactive water quality dashboard to verify current beach conditions before swimming or engaging in water activities.