Toxic Bacteria Found in Charles River

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Boston Public Health officials are warning local residents after abnormal levels of toxic blue-green algae were found in the city’s Charles River on Thursday.

The blue-green algae, also known as cyanobacteria, turns the water murky, gives off a foul odor, and is harmful to humans and animals. In some rare cases, exposure to the toxins can cause death.

The algae blooms were found in the Lower Charles River Basin, the Weld Boathouse in Cambridge and the Charles River Dam.

Tests on the river indicated bacteria levels were nearly twice the recommended limit, forcing officials to advise caution. 51,000 cells/mL of water is considered safe.

Warning signs have been posted along the river. Water ingestion can cause illness. Swimming in the water is not recommended. Posted advisories warn, “Do not swallow the water. Rinse off after contact.”

Jamaica Pond in Jamaica Plain was recently closed down for nearly a month after an identical bacteria outbreak.