Boston Expands Charles River Cyanobacteria Advisory

BOSTON, MA — Boston health officials expanded a public health advisory for the lower Charles River Thursday after elevated levels of cyanobacteria were detected in the water.

The advisory now covers all points downstream of Boston University’s Duan Family Center for Computing and Data Sciences, commonly known as the “Jenga Tower,” according to the Boston Public Health Commission.

State health officials found cyanobacteria levels exceeding Massachusetts guidelines for recreational waterways. Residents are being advised to avoid swimming and other activities involving direct contact with the affected water or shoreline.

Dogs should also be kept out of the river and should not be allowed to drink the water.

Cyanobacteria, also known as blue-green algae, can produce toxins harmful to people and animals. Exposure may cause skin and eye irritation, respiratory problems, vomiting, or diarrhea, according to health officials.

More serious liver, kidney, and neurological problems are possible when toxins are present. Children and small pets may face a greater risk because of their lower body weight.

Anyone who comes into contact with the affected water or algae should rinse off immediately. Pet owners should contact a veterinarian if a dog develops vomiting, staggering, drooling, or convulsions after a possible exposure.

The advisory will remain in place while the Massachusetts Department of Public Health continues monitoring the river. Two rounds of samples collected one week apart must fall below the state threshold before the warning can be lifted.

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